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 outermost layer of a blood vessel is known as

  1. The tunica intima

  2. The tunica media

  3. The tunica externa

  4. The pericardium
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The tunica externa, also known as the tunica adventitia (or adventitia), is the outermost layer of a blood vessel, surrounding the tunica media. It is mainly composed of collagen and is supported by external elastic lamina.

Multiple choice

Which of the following statements is wrong regarding the tunica media? 

  1. The middle coat is composed of a thin layer of connective tissue with elastic fibres.

  2. In the smaller arteries, it consists principally of plain muscle fibres in fine bundles, arranged in lamellو and disposed circularly around the vessel.

  3. In the larger arteries, as the iliac, femoral, and carotid, elastic fibres unite to form lamellو which alternate with the layers of muscular fibres.

  4. In the largest arteries, as the aorta and brachiocephalic, the amount of elastic tissue is very considerable.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The middle coat is composed of a thick layer of connective tissue with elastic fibres, intermixed, in some veins, with a transverse layer of muscular tissue.

Multiple choice

Oxygenated blood is found in the ______________.

  1. superior venacava

  2. right ventricle

  3. inferior venacava

  4. pulmonary vein

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

The pulmonary vein carries oxygenated blood from the lungs and opens into the left atrium. This oxygenated blood is then supplied to the entire body through the aorta.

Multiple choice

The largest blood vessel in the human body is _____.

  1. superior vencava

  2. pulmonary arteries

  3. coronary arteries

  4. aorta

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

The aorta is the largest artery in the human body, originating from the left ventricle and distributing oxygenated blood to all parts of the body. It has a diameter of about 2.5-3.5 cm. The superior vena cava is a large vein, pulmonary arteries carry deoxygenated blood, and coronary arteries supply the heart muscle itself.

Multiple choice

Which of the following options is correct?

  1. Lymph is a medium of circulation in body.

  2. Lymph flows in one direction.

  3. Subclavian veins carry lymph from the heart.

  4. Both 1 and 2

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

This is the correct answer option as both statements are correct. Lymph is a medium of circulation in body. Lymph flows in one direction from body tissues to the heart.

Multiple choice

Which of the following pairs is incorrectly matched?

  1. Pulmonary vein - deoxygenated blood

  2. Heart - circulatory system

  3. Transpiration - plant conduction

  4. RBC - haemoglobin
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pulmonary vein carries oxygenated blood, and not deoxygenated blood. Therefore, option (1) is the correct answer.

Multiple choice

Which of the following prevent(s) back flow of blood in veins?

  1. Thin walls

  2. Low pressure of blood flow

  3. Valves

  4. Elastic fibres in the walls of veins
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Veins are thin-walled blood vessels which carry deoxygenated blood from all parts of the body to heart. The valves present in veins prevent the back flow of blood.

Multiple choice

The right side of heart deals with

  1. oxygenated blood

  2. deoxygenated blood

  3. mixture of oxygenated and deoxygenated blood

  4. Either (1) or (2)
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The right side of heart deals with deoxygenated blood.