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 softskills leadership

artery

  1. blood-vessel

  2. wasteful

  3. marked by vulgar lewd humor

  4. stop or check flow of blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

An artery is a blood vessel that carries oxygenated blood away from the heart to various parts of the body (except for pulmonary arteries). Option B (extravagant) relates to 'arteriosclerosis' but is not the meaning of 'artery' itself. Options C and D are unrelated.

Multiple choice

Which among the following does not characterise the open circulatory system?

  1. Blood flows with high velocity in the body.

  2. Direct exchange of materials between the cells and the blood in the body.

  3. RBCs are absent in the blood.

  4. The blood flows from the heart into the arteries.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In open circulatory system, the blood usually flows at a very low velocity and at low pressure as the smooth muscles are absent .

Multiple choice

Which of the following does not characterise closed circulatory system?

  1. Blood flows at high speed.

  2. The blood itself increases the efficiency of circulation.

  3. The blood flows in blood vessels only.

  4. The volume of blood is independent of the muscles of the blood vessels.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

In this type of circulatory system, the volume of blood flowing through any organ of the body is regulated by the contraction and relaxation of the muscles of the blood vessels.

Multiple choice

The blood vascular system of frogs is

  1. closed

  2. open

  3. heterogenic

  4. All of the above

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

The vascular system of frog is well-developed closed type. Frogs have a lymphatic system also. The blood vascular system involves heart, blood vessels and blood.

Multiple choice

Blood vessels are covered by

  1. epithelial tissues

  2. connective tissues

  3. muscular tissues

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

Blood vessels are covered by epithelial tissues.

Multiple choice

Which among the following does not characterise the cardiovascular system of the human body?

  1. The elastic arteries are the major branches of aorta.

  2. The systemic and pulmonary circulations are perfused in series.

  3. Perfusion of the systemic circulation requires a much higher pressure.

  4. Blood re-enters the heart through the venae cavae.

  5. The cardiovascular system electrolytes to the body cells and nullify thermoregulation.
Reveal answer Fill a bubble to check yourself
E Correct answer
Explanation

The key functions of the cardiovascular system are: Distribution of O2, water, electrolytes and nutrients to all body tissues; transportation of CO2 and metabolic waste products from the tissues to the lungs and kidneys; and thermoregulation.

Multiple choice

Blood platelets are also known as 'thrombocytes'. Which of the following statements is correct for blood platelets?

  1. They are present in greater number than RBCs.

  2. They release main clotting factors in the blood.

  3. They will attach to the walls of damaged blood vessels.

  4. They conjoin in the presence of prostacyclin.

  5. Blood platelets bear a prominent nucleus, which regulates hemostasis and thrombosis.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In case of injury, the damaged endothelial cells lining the blood vessel release von Willebrand's Factor, which makes the surfaces sticky. The platelets start adhering to the surfaces of endothelial cells. This effect is called platelet adhesion.

Multiple choice

What is the process of transferring of blood from one person to another called?

  1. Leucopoiesis

  2. Erythropoiesis

  3. Blood agglutination

  4. Blood transfusion

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

It is the process of transferring blood or blood based products from one person into the circulatory system of another. Blood transfusions can be life saving in some situations such as massive blood loss due to trauma, or can be used to replace blood lost during surgery. Blood transfusions may also be used to treat a severe anaemia or thrombocytopenia caused by a blood disease.

Multiple choice

Venules are formed from

  1. capillaries

  2. endothelium

  3. arteriole

  4. artery

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

A venule is a very small blood vessel in the microcirculation that allows blood to return from the capillary beds to the larger blood vessels called veins. Venules range from 8 to100 μm in diameter, and are formed when capillaries unite together. Many venules unite to form a vein.

Multiple choice

In which organ is deoxygenated blood oxygenated during its circulation?

  1. Heart

  2. Lungs

  3. Pancreas

  4. Liver

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

The deoxygenated blood is pumped from heart to the lungs. When we breathe in air, it contains oxygen. The gases dissolved in the alveoli of the lungs are passed through the membrane of the alveoli into the capillaries. In the capillaries, the red blood cells containing haemoglobin will bind to the oxygen molecules thus making the blood oxygenated again.