Hydrostatic pressure

Definition

Hydrostatic pressure is the pressure exerted by a fluid due to the force of gravity. In the human body, it plays a crucial role in the movement of fluids across capillary walls.

5 Must Know Facts For Your Next Test

1. Hydrostatic pressure is higher at the arterial end of capillaries and lower at the venous end.
2. It drives fluid out of capillaries into interstitial spaces, contributing to tissue perfusion.
3. Opposing hydrostatic pressure is oncotic pressure, which pulls fluid back into capillaries.
4. Changes in hydrostatic pressure can impact blood volume and blood pressure regulation.
5. Edema can result from an imbalance between hydrostatic and oncotic pressures.

Review Questions

• How does hydrostatic pressure contribute to fluid movement in capillaries?
• What factors can cause changes in hydrostatic pressure within the circulatory system?
• Explain the relationship between hydrostatic and oncotic pressures.

Related terms

Oncotic Pressure:

The osmotic pressure exerted by proteins in blood plasma that pulls water into the circulatory system.

Capillary Filtration: The process where fluid moves out of capillaries due to hydrostatic pressure.

Edema:

A condition characterized by excess fluid accumulation in tissues, often due to imbalances in hydrostatic and oncotic pressures.