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Class 7 Hindi — Vasant Chapter 6 रक्त और हमारा शरीर — Formulas & Key Points

रक्त और हमारा शरीर by यशपाल is a core science-based chapter in NCERT Class 7 Hindi Vasant that bridges language learning with biology. Unlike literary chapters, this पाठ demands precise recall of technical terms, component functions and circulatory pathways. CBSE examiners test comprehension through definition-based short answers (2-3 marks) and diagram labelling. This formula sheet organizes every testable fact, bilingual term and numerical value from the chapter into revision-friendly tables and mnemonics.

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Key takeaways

✓रक्त और हमारा शरीर is a विज्ञान आधारित पाठ, so focus on tकनीकी शब्दावली and exact definitions of blood components.
✓रक्त has four main components: लाल रक्त कण, श्वेत रक्त कण, प्लेटलेट्स और प्लाज़्मा — each has a distinct function.
✓Heart (हृदय) has four chambers: two atria (अलिंद) and two ventricles (निलय); right side pumps to lungs, left to body.
✓Arteries (धमनियाँ) carry oxygen-rich blood away from heart; veins (शिराएँ) bring deoxygenated blood back — except pulmonary vessels.
✓Important numbers: 5 litres of blood in adult body, 72 heartbeats per minute, 120/80 mm Hg normal blood pressure.
✓Common exam mistakes: confusing श्वेत रक्त कण function with लाल रक्त कण, mixing up धमनी and शिरा definitions.
✓CBSETUTOR.ai provides 24×7 AI tutoring for Class 7 with photo upload and step-by-step solutions at ₹999/month across all subjects — 3-day free trial available.

रक्त के घटक — Components of Blood (Definition Table)

The chapter explains that blood is not a simple fluid but a specialized connective tissue. Each component has a distinct structure and role. CBSE exams often ask 'रक्त के चार मुख्य घटकों के नाम लिखिए' (2 marks) or 'लाल रक्त कण और श्वेत रक्त कण में अंतर' (3 marks). Memorize the Hindi-English pairs exactly as they appear in the NCERT text. The plasma percentage (55%) and cellular components (45%) ratio is also testable. Students often confuse प्लेटलेट्स with प्लाज़्मा — remember प्लेटलेट्स are cells, प्लाज़्मा is liquid.

लाल रक्त कण (RBC / Red Blood Cells): contain haemoglobin, transport oxygen and carbon dioxide, give blood its red colour
श्वेत रक्त कण (WBC / White Blood Cells): fight infections and diseases, part of immune system, colourless
प्लेटलेट्स (Platelets): help in blood clotting, prevent excessive bleeding from injuries
प्लाज़्मा (Plasma): yellowish liquid part, 90% water, transports nutrients, hormones, waste products
Typical exam question: 'रक्त का कौन-सा घटक ऑक्सीजन ले जाता है?' Answer in one word: लाल रक्त कण या हीमोग्लोबिन

हृदय की संरचना — Structure of Heart (Organ Formula Table)

The heart is described as a muscular pump with four chambers. The chapter uses both Sanskrit-origin terms (अलिंद, निलय) and common Hindi. CBSE diagrams often label these in Hindi, so spelling matters. Right side (दाहिना भाग) handles deoxygenated blood from body to lungs; left side (बायाँ भाग) pumps oxygenated blood from lungs to body. The septum (पट) prevents mixing. Many students write 'हृदय में दो कोष्ठ होते हैं' instead of चार — this costs marks. Remember the mnemonic: 'अ-नि-अ-नि' (atrium-ventricle-atrium-ventricle) for top-bottom, right-left chambers.

दाहिना अलिंद (Right Atrium): receives deoxygenated blood from body via superior and inferior vena cava
दाहिना निलय (Right Ventricle): pumps deoxygenated blood to lungs via pulmonary artery
बायाँ अलिंद (Left Atrium): receives oxygenated blood from lungs via pulmonary veins
बायाँ निलय (Left Ventricle): pumps oxygenated blood to entire body via aorta (महाधमनी), thickest chamber
Valves (कपाट): ensure one-way blood flow, prevent backflow between chambers and vessels

रक्त वाहिकाएँ — Blood Vessels (Comparison Table)

Three types of blood vessels are explained: धमनियाँ (arteries), शिराएँ (veins) and केशिकाएँ (capillaries). The most common mistake is assuming all arteries carry oxygen-rich blood. Exception: pulmonary artery carries deoxygenated blood to lungs. Similarly, pulmonary veins carry oxygenated blood from lungs. The chapter emphasizes thick elastic walls of arteries versus thin walls of veins. Capillaries are one-cell thick for nutrient exchange. CBSE 3-mark questions often ask: 'धमनी और शिरा में तीन अंतर लिखिए।' Always include wall thickness, direction of flow and valve presence.

धमनियाँ (Arteries): carry blood AWAY from heart, thick elastic walls, no valves (except at heart exit), high pressure, usually oxygenated (except pulmonary artery)
शिराएँ (Veins): carry blood TO heart, thin walls, have valves to prevent backflow, low pressure, usually deoxygenated (except pulmonary veins)
केशिकाएँ (Capillaries): microscopic, connect arteries to veins, one-cell thick walls, site of exchange of gases and nutrients with tissues
महाधमनी (Aorta): largest artery, emerges from left ventricle, distributes oxygenated blood to body
Mnemonic: 'A for Away' — Arteries carry blood Away from heart

रक्त परिसंचरण — Blood Circulation Process (Pathway Table)

The chapter describes a double circulation system: pulmonary (फुफ्फुसीय) and systemic (दैहिक). Blood passes through the heart twice in one complete circuit. Right side handles deoxygenated blood to lungs; left side distributes oxygenated blood to body. Understanding this pathway is crucial for 5-mark descriptive answers. Write the sequence step-by-step: body → vena cava → right atrium → right ventricle → pulmonary artery → lungs (gas exchange) → pulmonary veins → left atrium → left ventricle → aorta → body. Students often skip the lung step or reverse atrium-ventricle order.

Step 1: Deoxygenated blood from body tissues enters right atrium via superior and inferior vena cava
Step 2: Right atrium contracts, blood flows into right ventricle through tricuspid valve
Step 3: Right ventricle contracts, pumps blood to lungs via pulmonary artery for oxygenation
Step 4: Oxygenated blood returns from lungs to left atrium via pulmonary veins
Step 5: Left atrium contracts, blood enters left ventricle through bicuspid (mitral) valve
Step 6: Left ventricle contracts powerfully, pumps oxygenated blood to entire body via aorta and arteries
Gas exchange occurs in lungs (oxygen in, carbon dioxide out) and in body tissues (oxygen out, carbon dioxide in)

तकनीकी शब्दावली — Technical Vocabulary (Hindi-English Glossary)

Since this is a विज्ञान आधारित पाठ embedded in a Hindi textbook, CBSE expects students to know both Hindi and English equivalents of scientific terms. Examiners may ask: 'रक्तचाप को अंग्रेज़ी में क्या कहते हैं?' or use English in diagram labels. Spelling errors in Hindi medical terms are heavily penalized. Practice writing हीमोग्लोबिन, प्लेटलेट्स, धमनी with correct matras. Also understand that पल्स (pulse) and हृदय-स्पंदन (heartbeat) are tested interchangeably. The normal resting pulse rate for adults is approximately 72 beats per minute; children have slightly higher rates around 80-90.

रक्तचाप (Blood Pressure): force exerted by blood on artery walls, measured in mm Hg, normal adult 120/80
हीमोग्लोबिन (Haemoglobin): iron-containing protein in RBCs that binds oxygen, gives red colour
रक्त-स्कंदन (Blood Clotting): process by which platelets and plasma proteins form a clot to stop bleeding
पल्स / नाड़ी (Pulse): rhythmic expansion of artery due to heartbeat, felt at wrist or neck
ऑक्सीजनयुक्त / ऑक्सीजनित (Oxygenated): blood rich in oxygen, bright red
विऑक्सीजनित / CO₂ युक्त (Deoxygenated): blood low in oxygen, high in CO₂, dark red
फुफ्फुसीय परिसंचरण (Pulmonary Circulation): heart → lungs → heart circuit
दैहिक परिसंचरण (Systemic Circulation): heart → body → heart circuit

Important Numbers & Facts (Numerical Data Table)

The chapter provides specific quantities that appear in objective questions and fill-in-the-blanks. CBSE loves to test 'एक वयस्क के शरीर में कितना रक्त होता है?' (5 litres) or 'सामान्य रक्तचाप कितना होता है?' (120/80 mm Hg). Memorize these exact figures. The heartbeat count per minute (लगभग 72) can vary with age, fitness and activity — chapter uses 72 as average resting rate. Blood accounts for about 7-8% of body weight. RBCs live approximately 120 days before being replaced. One drop of blood contains millions of RBCs.

Total blood volume in adult human: लगभग 5 लीटर (about 5 litres or 5000 mL)
Normal resting heart rate: लगभग 72 धड़कन प्रति मिनट (approximately 72 beats per minute)
Normal blood pressure: 120/80 mm Hg (systolic/diastolic)
Plasma percentage in blood: लगभग 55%, cellular components 45%
Lifespan of RBC: लगभग 120 दिन (about 120 days)
Haemoglobin normal range: men 13.5-17.5 g/dL, women 12-15.5 g/dL (not in chapter but useful for context)
Blood forms about 7-8% of total body weight

Memory Tricks & Mnemonics

रक्त और हमारा शरीर contains many similar-sounding terms that are easy to confuse under exam pressure. Mnemonics help lock the sequence and function distinctions. For blood components, remember 'ला-श्वे-प्ले-प्ला' (red-white-platelet-plasma) in order of importance in oxygen transport. For heart chambers, use 'दा-दा-बा-बा' (right atrium-right ventricle-left atrium-left ventricle) clockwise from top right. For artery vs vein, 'Artery = Away, Vein = inVeins (towards heart).' These simple hooks reduce silly mistakes in 1-mark MCQs where every point counts toward the final percentage.

'A for Away': Arteries carry blood Away from heart; Veins bring blood to (V-shape points to) heart
'Red-White-Clot-Flow': RBCs carry oxygen (red), WBCs fight infection (white), Platelets cause clotting, Plasma flows
'Right-Lung, Left-Body': Right side of heart pumps to Lungs, Left side pumps to Body
'अ-नि, अ-नि': top chambers अलिंद (atria), bottom निलय (ventricles), repeat twice for four chambers
'Thick-Artery, Thin-Vein': arteries need thick walls for high pressure, veins have thin walls and valves
'Pulse = Push': each heartbeat Pushes blood, creating a pulse you can feel at wrist
For spellings: हीमोग्लो-बिन (hemo-globin), प्ले-टलेट्स (plate-lets), धम-नी (dham-nee with one म)

Common Mistakes & Pitfalls (Error Prevention Checklist)

CBSE Class 7 Hindi Vasant answer sheets show recurring errors in Chapter 6. The biggest mistake is treating it like a story chapter and writing vague, flowery answers instead of precise definitions. Another frequent error: writing 'हृदय में दो भाग होते हैं' (two parts) when the question asks for chambers — correct answer is चार कोष्ठ (four chambers). Students mix up the exceptions in artery-vein rules, forgetting that pulmonary artery carries deoxygenated blood. In diagram labelling, arrows must show direction of blood flow; missing arrows or wrong direction loses marks. Finally, half-marks are lost for Hindi spelling mistakes in technical words like हीमोग्लोबिन or अलिंद.

Error 1: Writing 'RBC लड़ाई करता है' — WBCs fight infection, RBCs transport oxygen; don't confuse functions
Error 2: 'धमनी हमेशा ऑक्सीजन युक्त रक्त ले जाती है' — pulmonary artery is an exception, carries deoxygenated blood to lungs
Error 3: 'शिरा और धमनी एक ही हैं' — they differ in structure (wall thickness), function (direction), and valve presence
Error 4: Forgetting to label chambers in Hindi during diagram questions — always use दाहिना, बायाँ, अलिंद, निलय
Error 5: Writing 'हृदय दो भाग' instead of 'चार कोष्ठ' or 'चार वेश्म' when asked about chambers
Error 6: Misspelling हीमोग्लोबिन as हिमोग्लोबिन or प्लेटलेट्स as प्लेटलेट — careful with matras
Error 7: Not mentioning function when definition is asked — e.g., 'प्लाज़्मा' alone is incomplete; add 'पोषक तत्व पहुँचाता है'

Solved Mini-Examples for Answer Writing

Practicing short-answer formats builds speed and accuracy. CBSE Class 7 Hindi Vasant Chapter 6 questions are typically 1, 2, 3 or 5 marks. One-mark questions demand single-word or one-sentence answers. Two-mark questions need a definition plus one function or example. Three-mark questions ask for comparisons or three points. Five-mark questions require a process description with introduction and conclusion. Below are three worked examples mirroring real CBSE patterns. Notice the use of bullet points for 3-mark answers and numbered steps for 5-mark answers. Always underline key Hindi terms like हीमोग्लोबिन, प्लेटलेट्स to signal the examiner you know the exact vocabulary.

One-Glance Last-Minute Revision Box

Keep this box open on your phone or printed on a card the night before your CBSE Class 7 Hindi exam. It condenses the entire chapter into bite-sized facts you can read in under three minutes. Cover the right column, test yourself on definitions, then reveal to check. This box has saved countless students from last-minute panic. Focus especially on the four blood components and their functions, the four heart chambers and their roles, and the difference between arteries and veins including the pulmonary exceptions. If time is very short, memorize just this box and the three solved examples above.

रक्त के 4 घटक: (1) लाल रक्त कण — ऑक्सीजन परिवहन, हीमोग्लोबिन युक्त (2) श्वेत रक्त कण — संक्रमण से रक्षा (3) प्लेटलेट्स — रक्त का थक्का (4) प्लाज़्मा — तरल भाग, पोषक तत्व परिवहन
हृदय: 4 कोष्ठ — दाहिना अलिंद, दाहिना निलय (फेफड़ों को), बायाँ अलिंद, बायाँ निलय (शरीर को); पम्पिंग अंग
धमनी vs शिरा: धमनी — हृदय से दूर, मोटी दीवार, प्रायः O₂ युक्त (फुफ्फुसीय धमनी अपवाद); शिरा — हृदय की ओर, पतली दीवार, कपाट युक्त, प्रायः CO₂ युक्त (फुफ्फुसीय शिरा अपवाद)
परिसंचरण पथ: शरीर → वेना कावा → दाहिना अलिंद → दाहिना निलय → फुफ्फुसीय धमनी → फेफड़े → फुफ्फुसीय शिरा → बायाँ अलिंद → बायाँ निलय → महाधमनी → शरीर
संख्याएँ: 5 लीटर रक्त, 72 धड़कन/मिनट, 120/80 mm Hg रक्तचाप, 55% प्लाज़्मा, RBC जीवनकाल 120 दिन
तकनीकी शब्द: हीमोग्लोबिन, रक्त-स्कंदन, अलिंद, निलय, फुफ्फुसीय/दैहिक परिसंचरण, ऑक्सीजनयुक्त/विऑक्सीजनित
याद रखें: A = Away (Artery), Veins have Valves, Right-Lung Left-Body, exceptions are pulmonary vessels

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Frequently asked questions

What is the main theme of CBSE Class 7 Hindi Vasant Chapter 6 रक्त और हमारा शरीर?+

रक्त और हमारा शरीर is a विज्ञान आधारित (science-based) expository essay by यशपाल that explains the composition, function and circulation of blood in the human body. It covers the four components of blood, the structure of the heart, types of blood vessels, and the double circulation pathway.

What are the four components of blood mentioned in Chapter 6?+

The four main components are: (1) लाल रक्त कण (RBCs) that carry oxygen via haemoglobin, (2) श्वेत रक्त कण (WBCs) that fight infections, (3) प्लेटलेट्स that help in blood clotting, and (4) प्लाज़्मा, the liquid part that transports nutrients and waste. Each has a distinct function and is testable in exams.

How many chambers does the heart have and what are their Hindi names?+

The heart has four chambers (चार कोष्ठ): दाहिना अलिंद (right atrium), दाहिना निलय (right ventricle), बायाँ अलिंद (left atrium), and बायाँ निलय (left ventricle). The right side handles deoxygenated blood to lungs; the left side pumps oxygenated blood to the body.

What is the difference between धमनी (artery) and शिरा (vein)?+

Arteries carry blood away from the heart, have thick elastic walls, no valves (except at heart exit), and usually carry oxygenated blood. Veins carry blood to the heart, have thin walls with valves to prevent backflow, and usually carry deoxygenated blood. Exception: pulmonary artery carries deoxygenated blood; pulmonary veins carry oxygenated blood.

Why is हीमोग्लोबिन important according to the chapter?+

Haemoglobin (हीमोग्लोबिन) is an iron-containing protein found in red blood cells that binds oxygen in the lungs and releases it in body tissues. It also gives blood its red colour. Without adequate haemoglobin, the body cannot transport enough oxygen, leading to anaemia.

How much blood does an adult human body contain?+

An adult human body contains approximately 5 litres (लगभग 5 लीटर) of blood, which is about 7-8% of total body weight. This figure is commonly tested in CBSE Class 7 exams as a fill-in-the-blank or MCQ question.

What is the normal resting heart rate mentioned in the chapter?+

The chapter states that a normal resting heart rate is approximately 72 beats per minute (लगभग 72 धड़कन प्रति मिनट). This can vary with age, fitness level and activity, but 72 is the standard reference value for a healthy adult at rest.

What is the function of प्लेटलेट्स (platelets)?+

Platelets (प्लेटलेट्स) are small cell fragments in blood that play a crucial role in blood clotting (रक्त-स्कंदन). When an injury occurs, platelets gather at the site and form a clot to stop bleeding and begin the healing process. Deficiency leads to excessive bleeding.

What are the two types of blood circulation described in the chapter?+

The chapter describes (1) Pulmonary circulation (फुफ्फुसीय परिसंचरण): heart → lungs → heart, where blood gets oxygenated, and (2) Systemic circulation (दैहिक परिसंचरण): heart → body → heart, where oxygenated blood is delivered to tissues and deoxygenated blood returns.

How can CBSETUTOR.ai help with technical Hindi chapters like रक्त और हमारा शरीर?+

CBSETUTOR.ai provides 24×7 AI-powered tutoring where students can upload photos of questions or diagrams and receive instant, step-by-step solutions in Hindi. It covers all Class 7 subjects at ₹999/month with a 3-day free trial, making it affordable and accessible for mastering both language and science content in one chapter.

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