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 types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Which is incorrect?

  1. Veins are typically larger in diameter than arteries

  2. Because of their small size, blood flows more rapidly in capillaries than in other parts of circulatory system

  3. 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 circulatory system.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Blood flows slowest in the capillaries because the total cross-sectional area of the capillary bed is much larger than that of arteries or veins, which is necessary for efficient exchange of nutrients and gases.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

In closed circulatory system 

  1. The cells and tissues are directly bathed in the blood pumped out by heart

  2. Arteries and veins are lacking

  3. The capillaries are largest blood vessels and closed at their ends

  4. Blood circulates through a series of vessels of varying diameters
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

  • Closed circulatory system has blood enclosed all the time within the vessels. In this system, blood is pumped by the heart through vessels.
  • It is more structured and controlled.

So, the correct option is 'Blood circulates through a series of vessels varying diameters'

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Choose the correct answer from the alternatives given.
Which of the following is the part of a closed, but not an open, circulatory system?

  1. Heart

  2. Haemocoel

  3. Capillary beds

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

In an open circulatory system, the blood is not confined within blood vessels. The blood bathes the organs and tissues directly. Because of this the blood and the interstitial fluid have no distinction. Thus, the term hemolymph is used. The hemolymph is pumped by the heart through the vessels into the sinuses and then to the surrounding cells where the exchange of materials occur. The hemolymph is taken back to the heart through the ostia that close via the valves during heart contraction.

So, the correct option is 'Capillary beds'.

Multiple choice types of circulatory system circulatory pathways transportation in plants and circulation in animals body fluids and circulation biology

Choose the correct answer from the alternatives given.
In the sinuses of an open circulatory system,-blood is not segregated from:

  1. urine

  2. interstitial fluid

  3. digestive cavity

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

The open circulatory system is common to molluscs and arthropods. Open circulatory systems (evolved in crustaceans, insects, mollusks and other invertebrates) pump blood into a hemocoel with the blood diffusing back to the circulatory system between cells. Blood is pumped by a heart into the body cavities, where tissues are surrounded by the blood. So, the blood is not segregated from interstitial fluid.

So, the correct option is 'Interstitial fluid'.

Multiple choice evs circulation of blood circulatory system and organs basics of blood and heart transportation in living organisms

When the muscles of the heart contract?

  1. Blood is pumped from the right ventricle into the lungs.

  2. Blood flows from the lungs into the left auricle.

  3. Blood is pumped into the right auricle from all over the body.

  4. None of the above.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

During ventricular systole, the deoxygenated blood from the right ventricle enters the pulmonary trunk, which carries blood to lungs for oxygenation. Thus option A is the correct answer. 

Multiple choice evs circulation of blood circulatory system and organs basics of blood and heart transportation in living organisms

Which of the following statements is false?

  1. Oxygenated blood is pumped to all other parts of the body from left ventricle.

  2. Gaseous exchange in the alveoli happens through capillaries.

  3. Blood-from the right side of the heart enters into left side through right auricle and left auricle.

  4. Lungs oxygenate the deoxygenated blood.
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The pulmonary artery arises from the right ventricle and carries deoxygenated blood to lungs for oxygenation. Lungs oxygenate the deoxygenated blood. This oxygenated blood is pumped to all parts of the body. Thus option C is the correct answer. 

Multiple choice evs circulation of blood circulatory system and organs basics of blood and heart transportation in living organisms

.......... pumps deoxygenated blood to the lungs.

  1. Right auricle

  2. Right ventricle

  3. Left auricle

  4. Left ventricle
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

During ventricular systole, the deoxygenated blood from the right ventricle enters the pulmonary trunk, which carries blood to lungs for oxygenation. Thus option B is the correct answer. 

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

Blood from the left ventricle is pumped to

  1. Lungs

  2. Left auricle

  3. Right ventricle

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

The left ventricle is the thickest of the heart's chambers and is responsible for pumping oxygenated blood to tissues all over the body. By contrast, the right ventricle solely pumps blood to the lungs.

So, the correct option is 'All parts of the body'.

Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

The blood with no oxygen is received in the 

  1. Left atrium

  2. Left ventricle

  3. Right atrium

  4. Right ventricle
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
The heart is the pumping organ of the body. It consists of four chambers i.e., the right auricle, left auricle, right ventricle and left ventricle. The right auricle receives the deoxygenated blood from the body and pumps it to right ventricle which in turn pumps it to the pulmonary artery. Whereas left auricle receives blood from lungs and pumps it to left ventricle from where it is pumped to the whole body through the aorta. Thus, the correct answer is option C.
Multiple choice evs transportation in living organisms circulatory system and organs basics of blood and heart circulatory system

In order for the blood to flow from right ventricle to left ventricle in mammalian heart, it must flow through

  1. Right ventricle, pulmonary arteries, lungs, pulmonary veins, left atrium

  2. Right ventricle, pulmonary veins, lungs, pulmonary arteries, left atrium

  3. Right ventricle, right atrium, lungs, pulmonary veins, left atrium

  4. Right ventricle, systemic aorta, lungs, pulmonary veins, left atrium.
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Blood flows from the right ventricle into the pulmonary arteries to reach the lungs for oxygenation. After gas exchange, it returns via the pulmonary veins to the left atrium before entering the left ventricle.

Multiple choice biology the respiratory system factors affecting breathing exchange of gases transport of respiratory gases

Ischemia is insufficient blood flow to tissues which can result in 

  1. Asphyxiation

  2. Hypoxia

  3. Anemia

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

Ischemia, meaning insufficient blood flow to a tissue, can also result in hypoxia. This is called as 'ischemic hypoxia'. This can include an embolic event, a heart attack that decreases overall blood flow, or trauma to a tissue that results in damage. An example of insufficient blood flow causing local hypoxia is gangrene that occurs in diabetes. 

Therefore, the correct answer is option B.

Multiple choice biology human brain and sense organs the brain nervous system in humans central nervous system

Choose the correct answer from the alternatives given.
To which of the following organ/blood is supplied by the internal carotid artery?

  1. Kidney

  2. Liver

  3. Heart

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

The brain forms only 2% of the body but uses up to 20% of the oxygen. It is given the top priority during the distribution of oxygen-rich blood. The internal carotid arteries and vertebral arteries carry oxygen-rich blood from the heart to the brain. 

So, the correct option is 'Brain'.

Multiple choice bio-chemistry human body and organ system role of blood in transport function of blood blood and lymph body fluid

How blood maintains water balance in the body ?

  1. By regulating the pH of the body

  2. By bringing constant exchange of water between circulating blood and tissue fluid

  3. By transporting the excretory material

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

Blood maintains water balance in the body by bringing constant exchange of water between circulating blood and tissue fluid. Regulating pH and transportation of excretory material are other functions performed by blood.