QUESTION 1 In which direction are the main gases moved by the cardiovascular sys

Question

QUESTION 1

In which direction are the main gases moved by the cardiovascular system?

Both oxygen and carbon dioxide are moved from the lungs to the cells.

Both oxygen and carbon dioxide are moved from the cells to the lungs.

Oxygen is moved from the lungs and carbon dioxide is moved to the lungs.

Carbon dioxide moves from the lungs, and oxygen moves to the lungs.

QUESTION 2

Cells account for about what percentage of the total volume of blood?

75%

25%

100%

45%

10%

QUESTION 3

Veins always carry blood:

toward the lungs

toward the arteries.

toward the capillaries.

toward the heart.

QUESTION 4

What unique problems do multi-cellular organisms face?

Having too much surface area compared to their volume.

Finding nutrients and water.

Transporting substances (e.g. nutrients and wastes) around to all their different cells inside themselves.

All of the above are true.

None of the above is true.

QUESTION 5

Which blood vessels have the thinnest walls?

arteries

veins

ventricles

aorta

capillaries

QUESTION 6

Roughly what percentage of the total blood is made up of plasma?

55%

35%

25%

75%

45%

QUESTION 7

Which of the following is a true statement about mature red blood cells?

They are made in the heart.

They have a lot of mitochondria to supply them with enough ATP to keep up with their high level of activity.

They cannot make proteins because they have no nuclei.

All of the above are true.

None of the above is true.

QUESTION 8

Blood flow from the heart, to the lungs, and back to the heart is known as the:

pericardial circulation.

coronary circulation.

systemic circulation.

pulmonary circulation.

Aortic circulation.

QUESTION 9

Which type of blood vessel carries blood away from the heart?

bronchi

capillaries

atria

arteries

veins

QUESTION 10

A. = right atrium B. = left atrium C. = pulmonary artery D. = aorta E. = right ventricle F. = left ventricle Using the abbreviations in the above list, which of the sequences below has the correct order of blood flow?

D, lungs, A, E, C, body, B, F

B, F, C, lungs, A, E, D, body

E, C, lungs, B, F, D, body, A

body, A, B, E, F, C, D, lungs

D, B, F, body, C, A, E, lungs

QUESTION 11

A heart attack is caused by...

the failure of a one-way valve within the heart.

A build up of cholesterol on the valves within the heart.

a blockage of a coronary blood vessel.

a blockage of a blood vessels within the pulmonary circulation.

A build up of cholesterol in the blood vessels of the pulmonary circulation.

a.

Both oxygen and carbon dioxide are moved from the lungs to the cells.

b.

Both oxygen and carbon dioxide are moved from the cells to the lungs.

c.

Oxygen is moved from the lungs and carbon dioxide is moved to the lungs.

d.

Carbon dioxide moves from the lungs, and oxygen moves to the lungs.

Explanation / Answer

QUESTION 1

Ans:

Direction of the main gases moved by the cardiovascular system: c. Oxygen is moved from the lungs and carbon dioxide is moved to the lungs.

Explanation:

- One of the main jobs of the cardiovascular system is to deliver oxygen to the body.

- The exchange of oxygen and carbon dioxide occurs in our lungs.

- The pressure of O2 in our capillaries as it travels through our lungs is lower than the pressure of pressure of O2 in our lungs.

- Since high pressure gases want to travel into areas of low pressure, O2 naturally moves from our lungs into our blood.

- The reverse is true for CO2.

- The pressure of CO2 in our capillaries is higher than the pressure of CO2 in our lungs, so CO2 naturally travels from our blood and into our lungs.

- Hence, correct option is c.

QUESTION 2

Ans:

Cells account for about pecentage of the total volume of the blood: d. 45%.

Explanation:

- The blood that runs through the veins, arteries and capillaries is known as whole blood, a mixture of about 55% plasma and 45% blood cells.

- Hence, correct option is: d. 45%.

QUESTION 3

ANS:

Veins always carry blood: d. toward the heart.

Explanation:

- Veins carry blood from the tissues of the body back to the heart.

- Henc, correct option is: d.

QUESTION 4

Ans:

Unique problem do multi-cellular organism face is: c. Transporting substances (e.g. nutrients and wastes) around to all their different cells inside themselves.

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