Biology · General Awareness

Human Circulatory System

818 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

Arteries supplying blood to the heart are called

  1. carotid arteries

  2. hepatic arteries

  3. coronary arteries

  4. pulmonary arteries
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The heart muscle receives its own oxygenated blood supply through the coronary arteries branching off the aorta. Carotid arteries supply the head, hepatic arteries supply the liver, and pulmonary arteries go to the lungs.

Multiple choice

Circulatory system is a transportation system of moving substances. Which of the following functions is not performed by the circulatory system?

  1. It helps in blood clotting.

  2. It protects the body against infection.

  3. It carries away waste products to kidneys, lungs intestines.

  4. It transports food and oxygen to each body cell.

  5. It regulates blood pressure.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

This is the correct option as this is not a function of the human circulatory system. It regulates the blood temperature.

Multiple choice

In high mountain regions bleeding through nose occurs because

  1. the pressure of the blood capillaries is higher than the outside pressure

  2. the pressure at high altitudes is higher than that of the plains

  3. the blood pressure increases increases at high altitudes

  4. the blood pressure fluctuates and cause the blood vessels to break
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

At high altitudes, atmospheric pressure is lower. The internal blood pressure in the capillaries remains higher than the external pressure, which can cause delicate vessels in the nose to rupture.

Multiple choice

Blood does not coagulate inside the body due to the presence of

  1. Fibrin

  2. Haemoglobin

  3. Plasma

  4. Heparin
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Blood does not clot inside the body because if a person's blood contains antigen a, then serum must contain anybody b, serum should not contain antibody a otherwise the person's blood will agglutinate.

Multiple choice

Which of the following blood vessels are characterised by thick walls?

  1. Arteries

  2. Arterioles

  3. Capillaries

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

The walls of the arteries have smooth muscle fibre that contract and relax under the directions of the sympathetic nervous system. They have very thick walls. These blood vessels help in transporting blood away from heart. Except the pulmonary artery, all arteries carry oxygenated blood.

Multiple choice

Blood is a fluid connective tissue of the human beings. Which of the following statements regarding blood is false?

  1. Blood cells have an epithelial origin.

  2. Leukocytes can leave the blood stream.

  3. Erythrocytes contribute about 43% of the total volume of the blood.

  4. Erythrocytes are the dominant cells in the blood.

  5. The blood platelets perform their functions exclusively in the blood stream.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood is sometimes considered to be a fluid connective tissue because of the mesenchymal origin of its cells.

Multiple choice

Arteries carry

  1. Carbon dioxide rich blood

  2. Oxygen rich blood

  3. Cyanide rich blood

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Carbon dioxide rich blood is present in veins.