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

The blood circulation is under the control of nervous system. Which one is true regarding the nervous regulation of the circulation?

  1. Baroreceptors are authorative for the long-term regulation of systemic blood pressure.

  2. If the arterial pressure of a person suddenly falls, the baroreceptor reflex accelerates the heart rate.

  3. The baroreceptors lie in the aortic and carotid bodies.

  4. The coronary blood flow is controlled by the cardiac volume receptors.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This statement is correct. The most important function of the baroreceptor reflex is to stabilize perfusion pressure in the face of disturbances of circulatory homeostasis.

Multiple choice

Which of the following is correct regarding the control of the vasculature?

  1. Autoregulation signifies to nervous control of the blood vessels.

  2. Reactive hyperemia originates as a result of vasodilatation caused by accumulation of metabolites during exercise.

  3. Parasympathetic vasodilator fibers activate the blood vessels of the exocrine glands of the gastrointestinal tract.

  4. The diameter of the arterioles is completely regulated by the sympathetic nervous system only.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Parasympathetic vasodilator fibers pertain to the craniosacral division of the autonomic nervous system. These fibers activate the blood vessels of the exocrine glands of the gastrointestinal tract.

Multiple choice

'Microcirculation' is the flow of blood through the smallest vessels of the body. Which among the following characterises microcirculation?

  1. The exchange of solutes among the capillaries and body tissues occurs mainly through mass flow.

  2. The capillaries act as vital source of vascular resistance.

  3. All of the fluid circulating through the capillaries to the tissues is returned to the blood through the lymphatic circulation.

  4. The plasma proteins play key role in tissue fluid exchange mechanism.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This statement is correct. Plasma is the pale yellow coloured liquid part of blood and carries dissolved substances such as glucose and other products of digestion, hormones, vitamins, etc. Thus, it plays key role in tissue fluid exchange mechanism.

Multiple choice

The only artery which carries deoxygenated blood is _________.

  1. pulmonary artery

  2. renal artery

  3. hepatic artery

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

Deoxygenated (without oxygen) blood flows from the right atrium to the right ventricle and then, right ventricle pumps blood into the pulmonary artery. The pulmonary artery carries deoxygenated blood to the lungs, where it is supplied with fresh oxygen and carbon dioxide is removed.

Multiple choice

Regarding cerebrospinal fluid (CSF), which of the following is a false statement?

  1. CSF is produced in the choroid plexus and drains into the cerebral arterial circle.

  2. It moves metabolic wastes away from the cells of nervous tissue.

  3. It has a specific gravity of 1.007, thus it buoys the brain.

  4. It maintains a volume of 140-200 ml and a fluid pressure of 10mm Hg.

  5. All of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Cerebrospinal fluid is produced in the choroid plexus but drains into sub-arachnoidal space and ventricular system.

Multiple choice

Which of the following statements is/are correct?

a. The left side of the heart pumps blood only into the lungs. b. The two sides of the heart are separated completely by a partition. c. Arteries carry blood from heart to body organs.

  1. Only a

  2. Only b

  3. Only c

  4. Both b and c

  5. Both a and b
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct answer as both statements b and c are correct.  This option is incorrect as statement a is incorrect. The left ventricle of the heart pumps blood to the entire body.

Multiple choice

Match the following:

a. Arteries 1. They are thin-walled and extremely narrow tubes or blood vessels which help in exchanging various materials between the blood and the body cells.
b. Capillaries 2. They are the thick-walled blood vessels which carry blood from the heart to all parts of the body.
c. Veins 3. They are the thin-walled blood vessels which carry blood from all parts of the body back to the heart.

  1. a - 2, b - 3, c - 1

  2. a - 1, b - 2, c - 3

  3. a - 1, b - 3, c - 2

  4. a - 2, b - 1, c - 3

  5. a - 3, b - 1, c - 2
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

This is the correct option. Arteries are the thick-walled blood vessels which carry blood from the heart to all parts of the body. Capillaries are thin-walled and extremely narrow tubes or blood vessels which help in exchanging various materials between the blood and the body cells. Veins are the thin-walled blood vessels which carry blood from all parts of the body back to the heart. This is a wrong option. Arteries are the thick-walled blood vessels which carry blood from the heart to all parts of the body. Capillaries are thin-walled and extremely narrow tubes or blood vessels which help in exchanging various materials between the blood and the body cells. Veins are the thin-walled blood vessels which carry blood from all parts of the body back to the heart.

Multiple choice

Veins have valves to

  1. prevent back flow of blood

  2. prevent the collapse of the vein

  3. maintain its position in the body

  4. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Veins collect blood from different organs and bring it back to the heart. They do not require thick walls as found in arteries because the blood is not under pressure. However, veins have valves that ensure that the blood flows only in one direction towards the heart and thus, prevent back flow of blood.