Topic 3: Mass Transport in animals

Question 1

What is tissue fluid?

Answer 1

Its the fluid that surrounds the cells in tissues, formed from blood plasma that has left the capillaries.

Question 2

What is the tissue fluid made out of?

Answer 2

-Oxygen
-Glucose
-Water
-Mineral ions
-Carbon dioxide
-Urea

Question 3

At what end of the capillary is tissue fluid formed?

Answer 3

Arterial end

Question 4

How is tissue fluid formed?

Answer 4

The hydrostatic pressure is greater than the osmotic pull, so the plasma is forced out of the capillary down a hydrostatic pressure gradient.

Question 5

How is hydrostatic pressure created?

Answer 5

As blood is pumped along the arteries into arterioles and then into the capillaries.

Question 6

What is the net movement of water in the arteriole end?

Answer 6

Water moves out.

Question 7

Where does the tissue fluid return to the capillary?

Answer 7

At the venule end of it.

Question 8

How is the tissue fluid able to return back to the capillary?

Answer 8

The osmotic pull is greater than the hydrostatic pressure, so fluid is drawn back into the capillary down the water potential gradient.

Question 9

Why does the hydrostatic pressure decrease in the venule end?

Answer 9

-Due to a loss of plasma volume
-Due to frictional resistance between blood and capillary walls.

Question 10

Why is the osmotic pressure greater at the venule end?

Answer 10

The dissolved proteins in the blood lower the water potential, creating a water potential gradient.