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

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📖 1. Introduction (परिचय)

Hindi:

मानव परिसंचरण तंत्र (Circulatory System) शरीर में ऑक्सीजन, पोषक तत्व और हार्मोन को एक स्थान से दूसरे स्थान तक पहुँचाने का कार्य करता है।

English:

The human circulatory system transports oxygen, nutrients, and hormones throughout the body.

❤️ 2. 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

🎯 Important Facts

  • Size = Fist
  • Location = Chest (slightly left)

🔄 3. Blood Circulation (रक्त संचार)

🔹 Double Circulation

Hindi:

रक्त दो बार हृदय से होकर गुजरता है।

English:

Blood passes through the heart twice.

🔹 Types

  1. Pulmonary circulation
  2. Systemic circulation

🩸 4. Blood (रक्त)

📌 Components

ComponentFunctionRBCOxygen transportWBCImmunityPlateletsClottingPlasmaTransport medium

🎯 Key Points

  • RBC contains Hemoglobin
  • WBC fights infection

🧵 5. Blood Vessels (रक्त वाहिकाएँ)

🔹 Arteries

Hindi:

  • हृदय से रक्त ले जाती हैं

English:

Carry blood away from heart

🔹 Veins

Hindi:

  • हृदय की ओर रक्त लाती हैं

English:

Carry blood to heart

🔹 Capillaries

Hindi:

  • गैस विनिमय

English:

Exchange of gases

🧠 6. Heart Working (हृदय का कार्य)

🔹 Process

  1. Blood enters right atrium
  2. Goes to right ventricle
  3. Goes to lungs
  4. Oxygenated blood returns
  5. Pumped to body

⚡ 7. Important Terms

  • Pulse rate = 72/min
  • Blood pressure = 120/80 mmHg

🎯 8. Exam-Oriented Facts

  • Heart = 4 chambers
  • RBC = oxygen
  • Arteries = away
  • Veins = towards

🧪 9. MCQs Practice

Q1. हृदय में कितने कक्ष होते हैं?

A. 2

B. 3

C. 4 ✅

D. 5

Q2. RBC का कार्य क्या है?

A. Defense

B. Oxygen transport ✅

C. Clotting

D. Digestion

Q3. Veins क्या करती हैं?

A. Away

B. Towards heart ✅

C. Oxygen

D. None

Q4. Double circulation का मतलब क्या है?

A. Once

B. Twice ✅

C. Thrice

D. None

Q5. Blood pressure कितना होता है?

A. 100/60

B. 120/80 ✅

C. 140/90

D. 80/40

📌 10. Previous Year Trends

Hindi:

SSC/Railway में पूछा जाता है:

  • Heart structure
  • Blood components
  • Vessels

English:

Frequently asked:

  • Heart
  • Blood
  • Vessels

🔚 11. Conclusion

Hindi:

Circulatory system जीवन के लिए अत्यंत आवश्यक है और exams में scoring topic है।

English:

The circulatory system is essential for life and a scoring topic in exams.

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