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 evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
The exchange of materials between blood and interstitial fluid occurs only in:

  1. Capillaries

  2. Arteries

  3. Veins

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

Capillaries are the smallest of a body's blood vessels, measuring 5-10 μm in diameter, which connect arterioles and venules, and enable the interchange of water, oxygen, carbon dioxide, and many other nutrients and waste chemical substances between blood and surrounding tissues. 

So, the correct option is 'Capillaries'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Find the incorrect answer from the following?

  1. Veins are typically larger in diameter than arteries

  2. Because of their small size,capillaries contain blood that is moving more quickly than in other parts of the circulatory system

  3. The walls of arteries are elastic,enabling them to stretch and shrink during changes in blood pressure

  4. Veins contain more blood than any other part of the circulatory system
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

As blood is pumped by the heart directly into the aorta, the blood travels at 30 cm/sec. From the aorta, blood flows into the arteries and arterioles and, ultimately, to the capillary beds. As it reaches the capillary beds, the rate of flow is dramatically (one-thousand times) slower than the rate of flow in the aorta. 

So, the correct option is 'Because of their small size, capillaries contain blood that is moving more quickly than in other parts of the circulatory system'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Pulmonary artery differs from pulmonary vein in having

  1. Thick wall

  2. Thin wall

  3. Valves

  4. Both (B) and (C)
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The blood in the pulmonary artery is under less pressure since it is only being pumped a short distance to the lungs and so does not need a thick wall. The aorta (which transports the blood over greater distances) receives blood under greater pressure from the powerful left ventricle and so needs a thicker wall. The pulmonary valve (pulmonic valve) is the semilunar valve of the heart that lies between the right ventricle and the pulmonary artery. Valves are used to prevent backflow of blood. The pulmonary vein carries oxygenated blood from the lungs to the left side of the heart, from the pulmonary circulation. The heart contraction is enough to keep the blood flowing as the distance between the lungs and back to the heart is minimal compared to the systemic circulation. So, the pressure of the heart exerting is enough to keep the blood in one direction.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Select the incorrect statements.
A. Arteries have thick elastic walls and veins have valves.
B. Capillaries are the smallest blood vessels supplying the tissues.
C. AV node is known as the pace setter of the heart.
D. Arteries carry blood towards the heart and veins carry blood away from the heart to different organs.

  1. A and B

  2. A and C

  3. C and D

  4. D only
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Arteries are blood vessels that carry blood away from the heart. While most arteries carry oxygenated blood, there are two exceptions to this, the pulmonary and the umbilical arteries. All veins carry blood towards the heart. 

Therefore, the correct answer is option D.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
An artery is a vessel that carries:

  1. blood away from the heart

  2. blood towards the heart

  3. oxygenated blood

  4. deoxygenated blood
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • An artery is a vessel which is thick walled, carries oxygenated blood (except pulmonary artery) away from the heart.
  • While veins are thin-walled, carry deoxygenated blood (except pulmonary vein) towards the heart.
So, the correct option is 'Blood away from the heart'.
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
The only artery which carries deoxygenated blood is the:

  1. pulmonary artery

  2. renal artery

  3. coronary artery

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

Pulmonary artery and the Pulmonary vein are a set of blood vessels that are related to the lungs. The Pulmonary artery carries deoxygenated blood from the right ventricle to the lungs for oxygenation, this oxygenated blood is carried back to the heart by the Pulmonary vein for systemic circulation i.e. for ​circulation to different parts of the body.

So, the correct option is 'Pulmonary artery'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
A vein differs from an artery in having

  1. strong muscular walls

  2. valves to control the direction of flow of blood towards the heart

  3. valves to control the direction of flow of blood opposite to the heart

  4. narrow lumen
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Veins are less muscular than arteries, contain valves to help keep blood flowing in the right direction, towards the heart. They carry deoxygenated blood from tissues back to the heart. 

So, the correct option is 'valves to control the direction of flow of blood towards the heart'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
Water enters capillaries on the venule side as a result of:

  1. higher red blood cell concentration on this side

  2. increased blood pressure on this side

  3. an osmotic pressure gradient

  4. active transport from tissue fluid
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

  • Materials, including oxygen, carbon dioxide, amino acids, sugars, and water, are exchanged between the blood and tissue fluid within blood vessels known as capillaries.
  • Blood pressure and osmotic pressure control the pressure in a capillary. Blood pressure, caused by the heart’s beating, is higher at the arterial end of the capillary and causes water to exit at that point.
  • On the other hand, blood pressure is weak by the time blood reaches the venous end of the capillary, and osmotic pressure becomes higher, causing water to enter at that end.
So, the correct option is 'An osmotic pressure gradient'.

Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Choose the correct answer from the alternatives given.
Which of the following is the bodys largest blood vessel?

  1. Aorta

  2. Capillaries

  3. Pulmonary vein

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

Aorta is the largest artery present in the body. It originates from the left ventricle and extends down to the abdomen. The aorta distributes oxygenated blood to all parts of the body.

So, the correct option is 'Aorta'.

Multiple choice evs circulation of blood circulatory system and organs blood and blood vessels transportation in living organisms role of receptors in the mouth types of teeth

The right side of the heart

  1. Pumps blood to the rest of the body

  2. Receives blood from the rest of the body

  3. Receives blood from the lungs

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
The right side of our heart receives oxygen-poor blood from our veins and pumps it to your lungs, where the blood picks up oxygen and gets rid of carbon dioxide. The left side of our heart receives oxygen-rich blood from our lungs and pumps it through our arteries to the rest of our body.
So, the correct option is 'Receives blood from the rest of the body'.
Multiple choice evs circulation of blood circulatory system and organs blood and blood vessels transportation in living organisms role of receptors in the mouth types of teeth

The component of the circulatory system is/are

  1. Arteries

  2. Heart

  3. Veins

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Circulatory system or cardiovascular system is the organ system that helps to transport oxygen, nutrients, hormones etc to all the cell of the body. It consists of heart, veins, arteries, capillaries. Thus, the correct answer is option D.

Multiple choice evs circulation of blood circulatory system and organs blood and blood vessels transportation in living organisms role of receptors in the mouth types of teeth

Circulatory system does not help in

  1. Transport of gases

  2. Transport of nutrients

  3. Transport of hormones

  4. Passage of impulses.
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The circulatory system transports gases, nutrients, and hormones. Nerve impulses are transmitted through the nervous system, not the circulatory system.

Multiple choice evs - i busy at work - our internal organs human lymphatic system lymph and its function lymph and tissue fluid

Consider the following statements:
$1$. Lymph transports oxygen to brain.
$2$. Lymph returns the intestinal fluid to the blood.
$3$. Lymph is modified blood that contains all except RBCs and certain proteins.
Which of the statement(s) given is/are correct?

  1. Only $2$
  2. $1$ and $2$
  3. $2$ and $3$

  4. All of these
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Lymph does not transport oxygen (that is the role of blood/hemoglobin). Lymph returns interstitial fluid to the blood and is similar to blood plasma but lacks RBCs and certain large proteins.