Net Filtration Pressure and Hydrostatic Forces

This tutorial explains the forces of filtration in the glomerulus, focusing on hydrostatic and oncotic pressures. It describes how these forces drive fluid and solutes across capillary membranes into Bowman's capsule. The tutorial also covers the calculation of net filtration pressure, using specific pressure values to illustrate the process. The importance of these forces in capillary circulation is highlighted, with a focus on their role in fluid movement and filtration.

What is the primary function of the forces of filtration in the glomerulus?

• To decrease blood volume

• To increase blood pressure

• To drive fluid and solutes out of the blood into Bowman's capsule

• To absorb nutrients into the blood

Which analogy is used to explain hydrostatic pressure?

• A sponge absorbing water

• A balloon with a small hole

• A dam holding back water

• A vacuum cleaner

What is the role of oncotic pressure in the glomerulus?

• To increase blood flow

• To push fluid out of the capillaries

• To pull fluid back into the capillaries

• To decrease blood pressure

Which force is responsible for moving fluid back into the capillaries from Bowman's capsule?

• Atmospheric pressure

• Hydrostatic pressure of blood

• Oncotic pressure

• Hydrostatic pressure of filtrate

Which force is not present in the opposite direction due to the absence of proteins in the filtrate?

• Oncotic pressure

• Hydrostatic pressure of blood

• Hydrostatic pressure of filtrate

• Atmospheric pressure

What is the net filtration pressure in a healthy adult?

• 20 mm of mercury

• 5 mm of mercury

• 10 mm of mercury

• 15 mm of mercury

What is the hydrostatic pressure of blood in the glomerular capillaries?

• 55 mm of mercury

• 65 mm of mercury

• 45 mm of mercury

• 30 mm of mercury

How is the net filtration pressure calculated?

• By adding all pressures together

• By subtracting the sum of hydrostatic pressure of filtrate and oncotic pressure from hydrostatic pressure of blood

• By multiplying all pressures

• By dividing hydrostatic pressure of blood by oncotic pressure

What is the hydrostatic pressure of the filtrate in Bowman's capsule?

• 20 mm of mercury

• 15 mm of mercury

• 25 mm of mercury

• 10 mm of mercury

What is the oncotic pressure in the glomerular capillaries?

• 30 mm of mercury

• 35 mm of mercury

• 20 mm of mercury

• 25 mm of mercury