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

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.

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

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

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