Question

Question 4

In capillary beds, there is mass movement of fluids and molecules into and out of capillary beds. For movement of fluids, simple diffusion is not sufficient and two pressure-based mechanisms are utilized.

1. Describe the action of the competing forces driving filtration of fluids in a capillary bed.
2. Describe the action of the competing forces driving reabsorption of fluids in a capillary bed.
3. Predict how physiological changes in the capillary beds in response to an increase in body temperature restores homeostasis.

Answer 1

A The mass movement of fluids and molecules into and out of the capillary bed requires a more efficient transport mechanism than simple diffusion. This mass movement is referred to as bulk flow it consists of two pressure driven mechanisms which are

1 volumes of fluid move from a higher pressure area in capillary bed to lower pressure area in the tissue through filtration

2 the movement of fluid from high pressure area in tissues to low pressure area in capillaries is called reabsorption

the two types of pressure that is needed to drive these two movements are - hydrostatic pressure and osmotic pressure

B the movement of fluid from high pressure area in tissues to low pressure area in capillaries is called reabsorption

the two types of pressure that is needed to drive this movement is - hydrostatic pressure and osmotic pressure

the primary force that that drives fluid transport between capillaries and tissues are known as hydrostatic force,capillary hydrostatic pressure is the pressure that is responsible in driving out the fluid from capillaries into the tissues.whereas osmotic pressure draws back the fluid in.