Question

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The net filtration pressure in capillaries is equal to the hydrostatic pressure of the blood

-plus the hydrostatic pressure of the tissue fluid outside.
-minus the hydrostatic pressure of the tissue fluid outside.
-and decreases along the length of the capillaries.
-and is constant along the length of the capillaries.

Answer 1

Step-by-step explanation:

The net filtration pressure in capillaries is equal to the hydrostatic pressure of the blood plus the hydrostatic pressure of the tissue fluid outside. Therefore, the correct options are:

- The net filtration pressure in capillaries is equal to the hydrostatic pressure of the blood plus the hydrostatic pressure of the tissue fluid outside.

- The net filtration pressure in capillaries decreases along the length of the capillaries.

Step-by-step explanation:

1. The net filtration pressure in capillaries is the force that drives the movement of fluid across the capillary walls. It is determined by the difference between the hydrostatic pressure of the blood inside the capillaries and the hydrostatic pressure of the tissue fluid outside the capillaries. This pressure difference is essential for the filtration of fluid and nutrients from the capillaries into the surrounding tissues.

2. The hydrostatic pressure of the blood inside the capillaries pushes fluid out of the capillaries, while the hydrostatic pressure of the tissue fluid outside the capillaries opposes this movement. The net filtration pressure is the algebraic sum of these two pressures.

3. As the blood flows from the arteriole end to the venule end of the capillary, there is a gradual decrease in the hydrostatic pressure of the blood. This decrease is due to factors such as resistance in the capillary bed and the loss of fluid volume through filtration. Consequently, the net filtration pressure also decreases along the length of the capillaries.

In summary, the net filtration pressure in capillaries is equal to the hydrostatic pressure of the blood plus the hydrostatic pressure of the tissue fluid outside, and it decreases along the length of the capillaries.

Answer 2

The net filtration pressure in capillaries is the hydrostatic pressure of blood minus the tissue fluid's hydrostatic pressure, which changes along the length of the capillaries due to hydrostatic and osmotic pressures.

Step-by-step explanation:

The net filtration pressure (NFP) in capillaries is equal to the hydrostatic pressure of the blood minus the hydrostatic pressure of the tissue fluid outside. NFP changes along the capillary bed and is influenced by hydrostatic pressure and osmotic pressure. At the arteriolar end, hydrostatic pressure in the capillaries is higher, facilitating the movement of fluid into tissues. As the blood moves towards the venous end, hydrostatic pressure decreases, while colloid osmotic pressure due to plasma proteins in the blood remains relatively constant. The interaction between hydrostatic pressure and osmotic pressure affects fluid movement, with excess fluid being carried away by the lymphatic system, thereby preventing tissue swelling.