Question

The velocity and pressure of blood is slowest and lowest in the capillary beds. Which of the following is not an accurate description of the benefits of slow, low pressure blood in the capillary beds?
- Lower pressure in the capillary bed helps to increase pressure in the venous circulation.
- Lower pressure reduces the chance of injury to delicate capillary vessels.
- Lower pressure on the venous end of the capillary bed allows for greater reabsorption of fluid back to the plasma.
- Slower blood flow through capillaries allows more time for diffusion to take place in the capillary bed.

Answer 1

Answer:

The statement that is not accurate is A. Lower pressure in the capillary bed helps to increase pressure in the venous circulation.

Explanation:

Capillaries can be described as essential blood vessels which connect arteries to the veins. Apart from transportation of blood, they are involved in the exchange of gases, essential nutrients and wastes from the tissues.

The walls of the capillary are very thin. Hence, the blood pressure in the capillaries should be low to avoid the capillaries from bursting.

The slow blood pressure and thin walls of the capillaries make it ideal for the diffusion of gases; oxygen and carbon dioxide mainly.

Hence, all other options are correct except option A.

Answer 2

The statement 'lower pressure in the capillary bed helps to increase pressure in the venous circulation' is NOT an accurate description of the benefits of low-pressure blood in the capillary beds.

• Capillaries refer to the small blood vessels that connect arteries and veins.

• In the capillaries, the blood pressure decreases (but blood velocity increases).

• The blood in the capillaries moves in a slow way in order to properly allow fluid and nutrients to flow between blood and tissues.

• The movement of fluid (plasma) from a high-pressure area to a low-pressure area in the capillaries is called reabsorption.

• The low pressure in the capillaries is fundamental for increasing the process of reabsorption.

In conclusion, the statement 'lower pressure in the capillary bed helps to increase pressure in the venous circulation' is NOT an accurate description of the benefits of low-pressure blood in the capillary beds.

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