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

Veins allow the flow of blood

  1. towards the heart

  2. towards the lungs

  3. away from the heart

  4. away from the lungs
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The correct option is (1).

Multiple choice

Which of the following chambers of heart collect blood?

  1. Auricles

  2. Ventricles

  3. Valves

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

The atrium is one of the two blood collection chambers of the heart. It was previously called the auricle, but that name is now used for an appendage of the atrium.

Multiple choice

What of the following statements is correct for pulmonary vein?

  1. It supplies blood to the heart muscles.

  2. It is the largest blood vessel in man.

  3. It is the smallest vein in our body.

  4. It is the only vein in our body to carry pure blood.

  5. It supplies blood to the organs in our body.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pulmonary vein is the only vein in our body to carry pure blood.

Multiple choice

Which of the following does not characterise the blood supply of the central nervous system?

  1. The vertebrobasilar system which constitutes the anterior circulation.

  2. At the core of the brain, the arteries form the circle of Willis.

  3. Abnormalities of blood flow in the carotid arteries frequently leads to the problems in the cerebral hemisphere.

  4. Abnormalities of blood flow in the vertebral arteries frequently leads to the defects in brainstem, cerebellum and posterior parts of the brain.

  5. Thrombus and emboli are the chief causes of blood flow obstructions in the brain.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

It is the incorrect statement. The carotid arteries form the anterior circulation to the brain, whereas the vertebral arteries merge to become the basilar artery (so called vertebrobasilar system), which constitutes the posterior circulation.

Multiple choice

In humans, the pulmonary artery originates from:

  1. fossa ovalis

  2. limbus of the 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 oxygenated haemolymph entering the heart is isolated by:

  1. coronary sulcus

  2. pericardial sinus

  3. sternocostal surface

  4. fibrous pericardium

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

It refers to the wall at the back of the pericardial sac. It acts as a collection reservoir to isolate oxygenated haemolymph entering the heart.

Multiple choice biology organization of life

Choose the correct answer from the alternatives givens.
When a human being is cold, the superficial blood vessels

  1. dilate, and the sweat glands are inactive

  2. dilate, and the sweat glands are active

  3. constrict, and the sweat glands are inactive

  4. constrict, and the sweat glands are active
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Vasoconstriction occurs in superficial blood vessels of warm-blood vessels of warm-blooded animals when their ambient environment is cold, this process diverts the flow of heated blood to the center of the animal, preventing the loss of heat

So, the correct answer is 'constricted, and the sweat glands are inactive'

Multiple choice biology organization of life

Circulatory system also performs the function of homeostasis.

  1. True

  2. False
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Homeostasis is a phenomenon of maintaining an equilibrium of internal environment despite constantly changing external environment. Various body systems are involved in performing the function of homeostasis. Circulatory system maintains homeostasis by continuous and controlled movement of blood that reaches every cell in the body. Nutrients pass from capillary blood into fluids surrounding the cells and waste products are removed.

Thus, the correct answer is option A.

Multiple choice

What is the body system involving your heart and blood?

  1. Respiration system

  2. Cardiovascular system

  3. Heart system

  4. Breathing system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The cardiovascular system consists of the heart, blood vessels, and blood, and is responsible for transporting nutrients and oxygen throughout the body.

Multiple choice

Blood can't flow backward through your veins due to

  1. negative pressure

  2. constant pressure supplied by the heart

  3. valves in the heart

  4. valves in the veins
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Veins contain one-way valves that prevent blood from flowing backward due to gravity or low pressure. These valves ensure that blood moves toward the heart.