Anatomy and Physiology Quiz 1

What are the key the differences between channel facilitated diffusion and carrier facilitated diffusion?

Channel facilitated diffusion involves the use of specific protein channels in the cell membrane to allow ions or polar molecules to pass through, while carrier facilitated diffusion involves carrier proteins that undergo conformational changes to transport substances across the membrane.

What is the difference between osmotic and hydrostatic pressure?

Osmotic pressure is the pressure required to prevent water movement across a semipermeable membrane due to solute concentration differences, while hydrostatic pressure is the pressure exerted by a fluid at equilibrium due to the force of gravity

What is an example of osmotic pressure in the body?

An example of osmotic pressure in the body is the movement of water into red blood cells when surrounding fluid is hypotonic, leading to swelling.

What is an example of hydrostatic pressure in the body?

An example of hydrostatic pressure in the body is the pressure exerted by blood against the walls of blood vessels, which helps maintain circulation and nutrient delivery.

Why does cell volume of cytosol and interstitial fluid remain relatively constant?

• because osmotic pressure of the cytosol is the same as the osmotic pressure of the interstitial fluid outside cells

• Because the osmotic pressure on both sides of the plasma membrane (which is selectively permeable) is the same, cell volume remains relatively constant.

What are the sources of cellular energy for active transport?

In what ways are endocytosis and exocytosis similar and different?

Both are forms of vesicular transport used by cells to move materials in and out. Endocytosis involves the engulfing of substances into the cell, while exocytosis involves the expulsion of materials from the cell.