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Circulatory System and Heart

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Q. What is the function of red blood cells?
  • A. To fight infections
  • B. To transport oxygen
  • C. To clot blood
  • D. To regulate body temperature
Q. What is the largest artery in the human body?
  • A. Pulmonary artery
  • B. Aorta
  • C. Coronary artery
  • D. Femoral artery
Q. What is the primary function of the circulatory system?
  • A. To digest food
  • B. To transport nutrients and oxygen
  • C. To regulate body temperature
  • D. To produce hormones
Q. What is the primary pacemaker of the heart?
  • A. Atrioventricular node
  • B. Bundle of His
  • C. Sinoatrial node
  • D. Purkinje fibers
Q. What is the role of the valves in the heart?
  • A. To increase blood pressure
  • B. To prevent backflow of blood
  • C. To oxygenate blood
  • D. To regulate heart rate
Q. What is the term for the contraction phase of the heart cycle?
  • A. Diastole
  • B. Systole
  • C. Arrhythmia
  • D. Fibrillation
Q. Which chamber of the heart receives deoxygenated blood from the body?
  • A. Left atrium
  • B. Right atrium
  • C. Left ventricle
  • D. Right ventricle
Q. Which circulatory system is found in mammals?
  • A. Open circulatory system
  • B. Closed circulatory system
  • C. Lymphatic system
  • D. Pulmonary system
Q. Which part of the heart is responsible for pumping oxygenated blood to the body?
  • A. Right atrium
  • B. Left atrium
  • C. Right ventricle
  • D. Left ventricle
Q. Which type of blood vessel carries blood away from the heart?
  • A. Veins
  • B. Capillaries
  • C. Arteries
  • D. Venules
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The Circulatory System and Heart chapter explains the structure, function, and regulation of blood circulation in humans and animals. It is a core topic in Zoology and Human Biology, essential for Class 11–12 students, NEET aspirants, and undergraduate learners, forming a direct link between anatomy, physiology, and health.

In this section, you will study:

  • Components of the circulatory system

  • Structure and working of the human heart

  • Blood vessels and types of circulation

  • Cardiac cycle and regulation of heartbeat

  • Blood pressure and its regulation

  • Disorders of the circulatory system

  • Transport of gases, nutrients, and wastes

  • NCERT-aligned explanations, diagrams, MCQs, and exam-oriented questions

The content is structured to build conceptual clarity, improve physiological understanding, and prepare students for school examinations, NEET, and undergraduate assessments.

Develop a strong foundation in circulatory system physiology to understand how blood circulation supports life, health, and homeostasis.

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