1. Which of the following is the correct sequence of blood flow? a. heart --> at

Question

1. Which of the following is the correct sequence of blood flow?

a. heart --> atery --> arteriole --> capillary --> vein --> venule --> heart

b. heart --> vein --> venule --> capillary --> arteriole --> artery --> heart

c. heart --> artery --> arteriole --> capillary --> venule --> vein --> heart

d. heart --> artery --> venule --> capillary --> arteriole --> vein --> heart

e. heart--> artery --> capillary --> arteriole --> venule --> vein --> heart

2. What are the functions of the elastic fibers that are found in the walls of ateries? (there may be more than one answer)

Select one or more:

a. they allow the artery to stretch and then recoil back to its original shape as blood is forcegully pumped from the heart into the arteries

b. they allow arteries to lengthen as the volume of blood in the arteries increase

c. they help maintain a steady blood pressure during the different phases of heart contraction

d. they smooth out the walls of the arteries to prevent turbulent blood flow

3. Which of the following are functions of the lymphatic system? (there may be more than one answer)

Select one or more:

a. help fight infections and cancer

b. allows excess interstitial fluid (fluid found between the cells in your tissues) to get dumped back into your blood

c. brings large molecules from fat digestion into the bloodstream so that they can be processed and stored

d. all of the above are functions of the lymphatic system

4. Which of the following blood vessels bring newly oxygenated blood from the blood vessels in the lungs back to the heart so that the heart can pump it to the rest of the body?

Select one:

a. aorta

b. inferior vena cava

c. pulmonary vein

d. pulmonary artery

5. Which of the following mechanisms help blood fight gravity so that, for instance, it can return from blood vessels in your feet back into your heart? (there may be more than one answer)

Select one or more:

a. breathing allows the pressure in your chest to decrease and allow blood to flow up towards your heart

b. as you walk, the skeletal muscles in your legs contract and squeeze the veins; since veins have valves, blood flows up and doesn't backflow back down

c. the force of blood flowing out of the heart and into the arteries pushes all of the blood along, causing blood to return to the heart

d. precapillary sphincters open to allow blood to flow back towards the heart

6. The tricuspid and bicuspid/mitral valves prevent backflow of blood from the atria into the ventricles.

Select one:

True

False

7. The following sequence represents the correct order of blood flow through the heart:

inferior and superior vena cava --> right atrium --> right ventricle --> pulmonary artery --> lungs --> pulmonary vein --> left atrium --> left ventricle --> aorta

Select one:

True

False

8. Capillaries are as wide as one red blood cell.

Select one:

True

False

9. The purpose of the coronary arteries is to bring oxygenated blood to the walls of the heart so that the muscles in the heart walls can contract.

Select one:

True

False

10. Vasodilation refers to the narrowing of blood vessels.

Select one:

True

False

Explanation / Answer

Q1. Answer :c

Heart--> artery--> arteriole--> capillary-->venule-->vein--> heart

Q2. Answer: a

The elastic fibres stretch and help the arteries to change into their original shape when the pressure is lifted off.

Q3. Answer:d All the options.

The lymphatic system has lymphocytes which fight various infection in our body and filter out blood for pathogens. It also balances out the amount of tissue fluid present. Fats are directed for digestion.

Q4. Answer: c

Pulmonary vein the is the blood vessel which brings the freshly oxygenated blood to the heart and only vein which supplies oxygen-filled blood.

Q5. Answer: b

Q6. Answer: False

Tricuspid and Bicuspid valves are present between the atria and ventricles and allow the blood to flow only from the atria into the ventricles and prevent the backward flow.

Q7. Answer: True

Q8. Answer: True

Capillaries are the tiniest blood vessels which directly supply the blood to the underlying tissues or cells. These are as wide as 5to 10 micrometres.

Q9. Answer: True

Coronary arteries supply the oxygen-rich blood to the wall of the heart.

Q10. Answer: False

Vasodilation means an increase in the diameter of the blood vessel to increase the flow of the blood.This usually occurs during an injury where the blood vessels near the site dilate to increase the flow.

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