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

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.

Multiple choice

Which of the following have thick elastic walls?

  1. Capillaries

  2. Veins

  3. Arteries

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

Arteries carry oxygen-rich blood from the heart to all parts of the body. Since the blood flow is rapid and at a high pressure, the arteries have thick elastic walls.

Multiple choice

Right part of the human heart contains

  1. Oxygenated blood

  2. Mixed blood

  3. Deoxygenated blood

  4. No blood
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Right part contains deoxygenated blood whereas left part contains oxygenated blood.

Multiple choice

The smallest blood vessels of the body are

  1. arteries

  2. venule

  3. veins

  4. capillaries

Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Capillaries are the smallest of a body's blood vessels and are parts of the microcirculation. They are only 1 cell thick. These microvessels, measuring 5-10 μm in diameter, connect arterioles and venules.

Multiple choice

The brachiocephalic veins combine to form

  1. superior vena cava

  2. artery

  3. aorta

  4. inferior vena cava
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The superior vena cava is located in the upper chest region and is formed by the joining of the brachiocephalic veins. It is bordered by heart structures such as the aorta and pulmonary artery.

Multiple choice

Which of the following carries deoxygenated blood?

  1. Pulmonary arteries

  2. Coronary Arteries

  3. Brachiocephalic Artery

  4. Pulmonary veins

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The pulmonary arteries are unique in that unlike most arteries which carry oxygenated blood to other parts of the body, the pulmonary arteries carry de-oxygenated blood to the lungs. After picking up oxygen, the oxygen rich blood is returned to the heart via the pulmonary veins.

Multiple choice

The artery can be distinguished from the vein in having _______.

  1. thicker walls

  2. more blood cells

  3. more plasma

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

Arteries carry blood away from the heart under high pressure, necessitating thick, elastic walls to withstand the force. Veins have thinner walls and valves to prevent backflow.