Tag: blood and blood vessels

Questions Related to blood and blood vessels

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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
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

Show answer
Correct Option: B

Acromion process is found in 

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

  1. Coxal bone

  2. Scapula

  3. Sternum

  4. Clavicle

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Correct Option: B
Explanation:

The acromial vein is actually a part of a greater network of veins located in the shoulder, near the acromion process in the scapula (shoulder blade). So the correct option is ' Scapula'.

Find the incorrect answer from the following?

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,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

Show answer
Correct Option: B
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'.

Pulmonary artery differs from pulmonary vein in having

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

  1. Thick wall

  2. Thin wall

  3. Valves

  4. Both (B) and (C)

Show answer
Correct Option: D
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.

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.

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

  1. A and B

  2. A and C

  3. C and D

  4. D only

Show answer
Correct Option: D
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.