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Biology – Human Circulatory System Complete Notes + Heart, Blood, Vessels, Process & MCQs (SSC, Railway, UPSC 2026)

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📖 1. Introduction (परिचय)

Hindi:

मानव परिसंचरण तंत्र (Human Circulatory System) शरीर में रक्त, ऑक्सीजन, पोषक तत्व और हार्मोन का परिवहन करता है। यह शरीर की सभी कोशिकाओं को जीवित रखने में महत्वपूर्ण भूमिका निभाता है।

English:

The human circulatory system transports blood, oxygen, nutrients, and hormones throughout the body and is essential for survival.

❤️ 2. Components of Circulatory System (मुख्य भाग)

ComponentFunctionHeartPumps bloodBloodTransport mediumBlood VesselsCarry blood

❤️ 3. Heart (हृदय)

📌 Definition

Hindi:

हृदय एक पेशीय अंग है जो रक्त को पंप करता है।

English:

The heart is a muscular organ that pumps blood.

🧠 Structure of Heart

  • 4 chambers
  • Right Atrium
  • Right Ventricle
  • Left Atrium
  • Left Ventricle

🎯 Key Points

  • Size = Fist
  • Located in chest
  • Beats ~72 times/min

🩸 4. Blood (रक्त)

📌 Components

ComponentFunctionRBCOxygen transportWBCImmunityPlateletsClottingPlasmaLiquid medium

🎯 Key Points

  • RBC contains hemoglobin
  • WBC fights infection

🛣️ 5. Blood Vessels (रक्त वाहिकाएँ)

🔹 Types

VesselFunctionArteriesCarry blood awayVeinsCarry blood to heartCapillariesExchange gases

🎯 Key Points

  • Arteries = Thick walls
  • Veins = Valves present

🔄 6. Blood Circulation (रक्त संचार)

🔹 Double Circulation

Hindi:

  • Pulmonary circulation
  • Systemic circulation

English:

  • Pulmonary (heart → lungs → heart)
  • Systemic (heart → body → heart)

🌬️ 7. Process of Circulation

Step-by-Step:

Hindi:

  1. Deoxygenated blood → Right atrium
  2. Right ventricle → Lungs
  3. Oxygenated blood → Left atrium
  4. Left ventricle → Body

English:

  1. Deoxygenated blood enters right atrium
  2. Moves to lungs
  3. Returns oxygenated
  4. Pumped to body

⚡ 8. Blood Pressure (रक्तचाप)

📌 Definition

Hindi:

रक्त द्वारा धमनियों की दीवारों पर डाला गया दबाव

English:

Pressure exerted by blood on artery walls

🎯 Normal Value

  • 120/80 mmHg

🧠 9. Important Concepts

  • Heart pumps continuously
  • Blood carries oxygen
  • Double circulation in humans

🎯 10. Exam-Oriented Facts

  • 4 chambered heart
  • RBC = Oxygen
  • Veins have valves
  • Arteries thick

🧪 11. MCQs Practice

Q1. हृदय में कितने कक्ष होते हैं?

A. 2

B. 3

C. 4 ✅

D. 5

Q2. RBC का कार्य क्या है?

A. Fight

B. Oxygen transport ✅

C. Clotting

D. Digestion

Q3. कौन रक्त को हृदय से दूर ले जाता है?

A. Veins

B. Arteries ✅

C. Capillaries

D. Plasma

Q4. Blood pressure कितना होता है?

A. 100/60

B. 120/80 ✅

C. 140/90

D. 90/60

Q5. Double circulation किसमें होता है?

A. Fish

B. Humans ✅

C. Plants

D. Bacteria

📌 12. Previous Year Trends

Hindi:

SSC/Railway में पूछा जाता है:

  • Heart structure
  • Blood function
  • Circulation

English:

Frequently asked:

  • Heart
  • Blood
  • Circulation

🔚 13. Conclusion

Hindi:

परिसंचरण तंत्र जीवन के लिए अत्यंत आवश्यक है और exams में बार-बार पूछा जाता है।

English:

The circulatory system is essential for life and frequently asked in exams.

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