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

Which blood vessels have the smallest diameter?

  1. Capillaries

  2. Arterioles

  3. Venules

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

Capillaries are the smallest blood vessels in the body, with a diameter just large enough to allow red blood cells to pass through in single file. This small size facilitates the efficient exchange of gases, nutrients, and waste products.

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

A vein differ from an artery in having

  1. Strong muscular walls

  2. Narrow lumen

  3. Valves that control direction of blood flow opposite to heart

  4. Valves that control direction of blood flow towards heart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Veins drain capillaries in the tissues and organs and return the blood to the heart. Veins have a unique structural feature which is not present in arteries. They are equipped with one way valves, that prevent the back flow of blood.

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

In which of the following character a vein differs from an artery?

  1. Having valves to control flow of blood

  2. Having narrow lumen

  3. Having muscular wall

  4. Having pigmented wall to give dark look
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Arteries carry blood from the ventricles (pumping chambers) of the heart out to the capillaries in organs and tissue. The smallest arteries are called arterioles.Veins drain capillaries in the tissues and organs and return the blood to the heart. The smallest veins are the venules.
Veins have a unique structural feature not present in arteries. They are equipped with one-way valves that prevent the backflow of blood.

So, the correct answer is option A.

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

An artery can be distinguished from a vein in having

  1. Thicker wall

  2. Oxygenated blood

  3. More haemoglobin

  4. Both A and B
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation
  • An artery carries oxygenated blood from the heart to different parts of the body. It has thick walls that allow it to withstand the high pressure of the blood.
  • Veins carry the deoxygenated blood from the different parts of the body to the heart which is further carried by the pulmonary artery for oxygenation. The veins have thin and elastic walls.
So, 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

Arteries are the

  1. Blood vessels which carry only oxygenated blood

  2. Blood vessels which carry only deoxygenated blood

  3. Blood vessels which carry blood from the heart to different organs of the body

  4. Blood vessels which carry blood from different organs of the body to the heart
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
Arteries carry oxygenated blood away from the heart to the tissues, except for pulmonary arteries, which carry blood to the lungs for oxygenation (usually veins carry deoxygenated blood to the heart but the pulmonary veins carry oxygenated blood as well.
So, the correct option is 'Blood vessels which carry blood from the heart to different organs of the body'.
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

Deoxygenated blood

  1. Flows to lungs from the left side of the heart.

  2. Flows to lungs from the right side of the heart.

  3. Flows to right side of the heart from the lungs.

  4. Flows to left side of the heart from the.lungs.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
Deoxygenated blood leaves the heart, goes to the lungs, and then re-enters the heart. Deoxygenated blood leaves through the right ventricle through the pulmonary artery. From the right atrium, the blood is pumped through the tricuspid valve (or right atrioventricular valve), into the right ventricle.
So, the correct option is 'Flows to lungs from the right side of the heart'
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

In which of the following ways do the veins differ from the arteries in mammals?

  1. Thicker walls

  2. Deeply present

  3. Carry blood away from heart

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

Veins have thin walls as compared to arteries and are superficially located. They carry deoxygenated blood towards the heart and have valves which prevent blood from going backward. Arteries are elastic and thick because they need to transport high-pressure blood while in veins blood flows in low pressure. 

So, 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

Blood vessels which carry blood from different organs of the body to the heart

  1. Veins

  2. Arteries

  3. Capillaries

  4. None of the above
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation
  • These are blood vessels that take blood back to the heart,  this blood contains less oxygen and is rich in waste products that are to be excreted or removed from the body. Veins become larger as they get closer to the heart. The superior vena cava is the large vein that brings blood from the head and arms to the heart, and the inferior vena cava brings blood from the abdomen and legs into the heart.
So, the correct option is 'Veins'.

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

Blood vessel carrying blood from the lungs to the heart is

  1. Pulmonary artery

  2. Pulmonary vein

  3. Coronary artery

  4. None of the above
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
A blood vessel carrying blood from the lungs to the heart is pulmonary vein. There are four pulmonary veins, two from each lung that drains into the left atrium of the heart. Pulmonary veins are responsible for carrying oxygenated blood from the lungs back to the left atrium of the heart. This differentiates the pulmonary veins from other veins in the body, which are used to carry deoxygenated blood from the rest of the body back to the heart.
So, the correct answer is 'Pulmonary vein'.
Multiple choice evs transportation in living organisms circulatory system and organs blood and blood vessels circulatory system blood pressure

When the right ventricle contract the blood goes into

  1. Aorta

  2. Brain

  3. Pulmonary artery

  4. None
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

During ventricular systole. The pressure increases in the ventricles, thus forcing the oxygenated blood from left ventricle into systemic aorta and deoxygenated blood from right ventricle into pulmonary aorta.

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

Capillary is defined as.

  1. That connects the artery and vein

  2. That connects the artery with lymphatic vessel

  3. That connects arteriole with venule

  4. That connects venule with lymph vessel
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Capillaries are microscopic vessels that form a network connecting arterioles (small arteries) to venules (small veins). This connection allows for the exchange of materials between the blood and the surrounding tissues.

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

Maximum amount of oxygen is lost from blood in.

  1. Arteries of body

  2. Capillaries surrounding the alveoli

  3. Left auricle of heart

  4. Capillaries surrounding the tissues
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Oxygen is delivered to body tissues through systemic capillaries. As blood passes through these capillaries, oxygen dissociates from hemoglobin and diffuses into the cells, resulting in a significant loss of oxygen from the blood.