Tag: circulatory system

Questions Related to circulatory system

Ventricular diastole takes place due to activity of

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

  1. Tissue

  2. Organ

  3. Organ system

  4. Cell organelle.

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Correct Option: A

Iter (Aqueduct of Sylvius) is found between

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

  1. Third and fourth ventricles

  2. Two lateral ventricles

  3. Lateral ventricles and third ventricle

  4. Rhinocoel and lateral ventricles

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Correct Option: A

Choose the correct answer from the alternatives given.
The heart sound dup is produced when:

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

  1. mitral valve is opened

  2. mitral valve is closed

  3. tricuspid valve is opened

  4. semilunar valve at the base of aorta gets closed

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Correct Option: D
Explanation:

In a healthy individual, there are two normal heart sounds called lub and dub. Lub is the first heart sound. It is associated with the closure of the tricuspid and bicuspid valves at the beginning of systole. The second heart sound dub is associated with the closure of the semilunar valves at the beginning of diastole.

So, the correct option is 'semilunar valve at the base of aorta gets closed'.

Choose the correct answer from the alternatives given.
Blood enters the heart because muscles of:

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

  1. atria relax

  2. ventricles relax

  3. atria contract

  4. ventricles contract

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Correct Option: A
Explanation:

Human blood passes from the inferior vena cava into the diastolic right atrium of the heart because of a pressure differential between the atrium and the vena cava. This negative pressure gradient is created by atrial diastole and pulls blood to the atrium which is then pumped to the ventricles by contraction.

So, the correct answer is atria relax.

Choose the correct answer from the alternatives given.
In normal heart action:

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

  1. right atrium and ventricle contract, followed by the contraction of the left atrium and ventricle

  2. two atria contract together, then the two ventricles contract together

  3. right atrium and left ventricle contract, followed by the contraction of the left atrium and right ventricle

  4. all four chambers of the heart contract and then relax simultaneously

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Correct Option: B
Explanation:

Due to one complete cardiac cycle, the two atria contract during the first 0.1 seconds, followed by ventricular systole for 0.3 seconds and finally joint diastole for 0.4 seconds. 

So, the correct option is 'Two atria contract together, then the two ventricles contract together'.

In which of the following points pulmonary artery is different from pulmonary vein?

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

  1. Its lumen is broad.

  2. Its wall is thick.

  3. It has valves.

  4. It does not possess endothelium

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Correct Option: B
Explanation:
The pulmonary artery carries deoxygenated blood from the heart to the lungs while the pulmonary vein carries oxygenated blood from the lungs to the heart. A pulmonary artery has a smaller lumen and thicker walls as compared to a pulmonary vein.
Thus, the correct answer is 'Its wall is thick.'

Given below are four statements (i-iv) regarding human blood circulatory system.
i. Arteries are thick-walled and have narrow lumen as compared to veins.
ii. Angina is acute chest pain when the blood circulation to the brain is reduced.
iii. Persons with blood group AB can donate blood to. any person with any blood group under ABO system.
iv. Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?

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

  1. i and iv

  2. i and ii

  3. ii and iii

  4. iii and iv

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Correct Option: A
Explanation:

i. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

ii. Angina Pectoris is a pain in the chest due to deprived oxygen the heart muscle experience constricting pain. This is not a fatal condition and the pain passes off quickly.
iii. Persons with blood group AB is a universal recipients. It has both the antigens A and B but no bodies.
iv.  During clot, Thromboplastin helps in the formation of an enzyme prothrombinase. This enzyme inactivates heparin and it also converts the inactive plasma protein prothrombin into its active form, thrombin. Both changes require calcium ions.
So, the correct answer is 'i and iv'.

Which of the following statements is incorrect?

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

  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.

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Correct Option: B
Explanation:

A. Arteries have thick, elastic walls and narrow lumen while veins have thinner, scarcely elastic walls and wide lumen.

B. Arteries branch out into smaller and thinner blood vessels called arterioles. these divide into still smaller vessels to provide blood to all the cells. The thinnest blood vessels are called capillaries. The flow of blood is very slow in capillaries.
C. The walls of arteries are a muscular and elastic coat. It consists of unstriated muscle fibres with some yellow elastic fibres are arranged in a circular manner. It holds the blood vessel open. This layer determines the amount of supply of blood to an organ and it maintains the blood pressure.
D. Veins bring back blood from the tissues and organs to the heart. The blood in veins flows under less pressure than that in arteries. Therefore, veins can accommodate more blood.
So, the correct answer is 'Because of their small size, blood flows rapidly in capillaries than in other parts of circulatory system'.

State the following statement true or false:


Arteries have openings

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

  1. True

  2. False

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Correct Option: B
Explanation:

Arteries do not have openings, while openings present in veins are called as valves. Blood after being pumped into arteries are under higher pressure than blood flowing in veins so to prevent backward flow of blood in veins valves are present.  Valves in veins also aid in the return of blood from the extremities to the heart.

So the correct answer is 'False'.

Splenic artery arises from?

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

  1. Anterior mesenteric artery

  2. Coeliac artery

  3. Posterior mesenteric artery

  4. Intestinal artery

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Correct Option: B
Explanation:
The splenic artery  is the blood vessel that supplies oxygenated blood to the spleen. It branches from the celiac artery, and follows a course superior to the pancreas. It supplies oxygenated blood to the arteries.
So, the correct option is 'Coeliac artery'.