Biology · General Awareness

Human Circulatory System

846 Questions

The human circulatory system explores the network of blood vessels, heart valves, and structural pathways. Test items often target blood flow sequences and specific vascular functions. Mastering these details is vital for biology preparation.

Heart valves and chambersBlood vessels and venulesArteries of the bodyBlood supply to organsCentral nervous system supply

Human Circulatory System Questions

Multiple choice

Maximum surface area of circulating system is seen in

  1. heart

  2. capillaries

  3. vein

  4. arterioles

  5. -
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Capillaries are fine branching blood vessels that form a network between the arterioles and venules. It is a tube which has an internal diameter of hair-like thinness.

Multiple choice

Blood vascular system of an earthworm is

  1. open type with Hb in RBC

  2. open type with Hb in plasma

  3. closed type with Hb in RBC

  4. closed type with Hb in plasma

  5. -
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Correct Answer: closed type with Hb in plasma

Multiple choice

A circulatory system which is formed by capillaries and ends with capillaries is

  1. renal

  2. hepatic

  3. double circulatory system

  4. hypophyseal

  5. `-
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The hypophyseal portal system is a system of blood vessels in the brain that connects the hypothalamus with the anterior pituitary. Its main function is the transport and exchange of hormones to allow fast communication between both glands. It is completely formed by capillaries.

Multiple choice

A vascular bundle without pith is

  1. protostele

  2. siphonostele

  3. solenostele

  4. None of these

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It was the most primitive form of stele and consisted of a solid core of xylem encased by phloem or of xylem interspersed with phloem.

Multiple choice

Which of the following is correct about arteries?

  1. They are thick walled and blood flows at high pressure

  2. They are thin walled and blood flows at low pressure

  3. They are thick walled and blood flows at low pressure

  4. None of the above

  5. -
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Correct Answer: They are thick walled and blood flows at high pressure

Multiple choice

Veins allow the flow of blood

  1. towards the heart

  2. towards the lungs

  3. away from the heart

  4. away from the lungs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct option is (1).

Multiple choice

Which of the following chambers of heart collect blood?

  1. Auricles

  2. Ventricles

  3. Valves

  4. Arteries
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The atrium is one of the two blood collection chambers of the heart. It was previously called the auricle, but that name is now used for an appendage of the atrium.

Multiple choice

What of the following statements is correct for pulmonary vein?

  1. It supplies blood to the heart muscles.

  2. It is the largest blood vessel in man.

  3. It is the smallest vein in our body.

  4. It is the only vein in our body to carry pure blood.

  5. It supplies blood to the organs in our body.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pulmonary vein is the only vein in our body to carry pure blood.

Multiple choice

Which of the following does not characterise the blood supply of the central nervous system?

  1. The vertebrobasilar system which constitutes the anterior circulation.

  2. At the core of the brain, the arteries form the circle of Willis.

  3. Abnormalities of blood flow in the carotid arteries frequently leads to the problems in the cerebral hemisphere.

  4. Abnormalities of blood flow in the vertebral arteries frequently leads to the defects in brainstem, cerebellum and posterior parts of the brain.

  5. Thrombus and emboli are the chief causes of blood flow obstructions in the brain.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is the incorrect statement. The carotid arteries form the anterior circulation to the brain, whereas the vertebral arteries merge to become the basilar artery (so called vertebrobasilar system), which constitutes the posterior circulation.