Tag: evs

Questions Related to evs

Number of major vessels pouring blood in right atrium is

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

  1. 1

  2. 2

  3. 3

  4. 4.

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Correct Option: C

Which of the following vessels has more nutrients than others?

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

  1. Vein arising from liver

  2. Superior Vena cava

  3. Vein arising from muscles

  4. Vein arising from Kidney

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Correct Option: A

Choroid plexus is network of

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

  1. Muscle fibres

  2. Lymph capillaries

  3. Blood capillaries

  4. Nerves

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Correct Option: C

The atria and ventricles are separated by deep transverse groove called

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

  1. Patent foramen ovale

  2. Mediastenum

  3. Auricular appendix

  4. Coronary sulcus.

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Correct Option: D

Why do veins have thin walls as compared to arteries?

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

  1. Veins collect the blood from different organs and bring it back to the heart

  2. The blood in the vein is in low pressure than artery

  3. The blood in the vein is in high pressure than artery

  4. Both A and B

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Correct Option: D
Explanation:

Arteries carry blood from the heart to various organs of the body under high pressure so they have thick and elastic walls. Veins collect the blood from different organs and bring it back to the heart. The blood is no longer under pressure so, the walls are thin with valves to ensure that blood flows only in one direction.

So, the correct answer is option D.

Which of the following statements about blood vessels is true?

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

  1. Arterial walls are generally thicker and contain more elastic tissue than venous walls

  2. Blood flows most rapidly through capillaries

  3. Blood pressure in arteries is always lower than in veins

  4. Venous walls are generally the strongest of all blood vessels and veins may contain valves

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Correct Option: A
Explanation:

In arteries the tunica media contains smooth muscle cells & elastic tissue, is thicker than that of veins so it can control and maintain blood pressure.

So, the correct option is 'Arterial walls are generally thicker and contain more elastic tissue than venous walls'.

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

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

  1. Capillaries

  2. Arteries

  3. Veins

  4. Arterioles

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Correct Option: A
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'.

Choose the correct answer from the alternatives given.
Capillaries are structurally suited for the exchange of substances because:

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

  1. their walls are composed of only one layer of squamous cells

  2. velocity of blood flow is slow

  3. they form networks that increase the surface area for diffusion

  4. all of the above

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Correct Option: A
Explanation:

Capillaries are any of the minute blood vessels that form networks throughout the bodily tissues; it is through the capillaries that oxygen, nutrients, and wastes are exchanged between the blood and the tissues. The velocity of blood is slowest as it reaches capillaries making the easy exchange of substances. Their minimal thickness because of their single layer of squamous cells also helps in this. 

So, the correct option is 'their walls are composed of only one layer of squamous cells'. 

State whether the following statements are true or false.
Veins generally have thicker walls than arteries.

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:

Veins are flattened with thin walls and hence have a wide lumen. Arteries are round with relatively thick walls. So, they have a narrow lumen. 

So, the correct option is 'False'.

Vessels that take blood to the heart from the body are called-

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

  1. Arteries

  2. Veins

  3. Capillaries

  4. None

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Correct Option: B