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

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.

Multiple choice

In open vascular system the circulating fluid is called

  1. perilymph

  2. lymphatic fluid

  3. haemolymph

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

In open circulatory systems (found in arthropods and mollusks), the circulating fluid is haemolymph. It directly bathes the organs and tissues, unlike blood in closed circulatory systems which is confined to vessels.

Multiple choice

Pulmonary vein carries oxygenated blood from

  1. lungs to heart

  2. all body parts

  3. heart to lungs

  4. heart to body parts
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Pulmonary veins are unique - they are the only veins that carry oxygenated blood, returning it from the lungs to the left atrium of the heart. All other veins carry deoxygenated blood back to the heart.

Multiple choice

In human beings, the pulmonary artery originates from

  1. limbus of the fossa ovalis

  2. fossa ovalis

  3. crista terminalis

  4. conus arteriosus

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

It is a conical extension of the right ventricle in the heart of mammals, from which the pulmonary artery originates.

Multiple choice

The heart is the pump of the human circulatory system. Which among the following does not characterise the circulation of blood by human heart?

  1. The majority of vasculature in the body constricts to norepinephrine.

  2. The papillary muscles are attached with the mitral valve.

  3. If the posterior descending artery is supplied by the circumflex artery (CX), then the coronary circulation is termed as left-dominant.

  4. During the ventricular systole, the subendocardial coronary vessels are compressed due to the high intra-artirial pressures.

  5. The heart regulates the amount of vasodilation or vasoconstriction of the coronary arteries.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

During contraction of the ventricular myocardium (systole), the subendocardial coronary vessels (the vessels that enter the myocardium) are compressed due to the high intraventricular pressures.

Multiple choice

Which among the following provide(s) blood supply to the penis?

  1. Genitofemoral artery

  2. Internal pudendal arteries

  3. Pampiniform plexus

  4. Femoral artery

  5. Greater palatine artery
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The internal pudendal arteries serve as the penile blood supply by entering the penis dorsally and running deep into the tissues of the corpora cavernosa. The internal pudendal artery becomes the penile artery.