Tissue Fluid And Lymph

Question 1

How is tissue fluid formed?

Answer 1

• water and small molecules exit via arterial end of capillary
• water and small molecules enter via venous end of capillary

Question 2

What is tissue fluid?

Answer 2

Water based fluid around cells

Question 3

What is osmotic pressure?

Answer 3

Pressure generated by movement of water molecules down the concentration gradient

Question 4

What is hydrostatic pressure?

Answer 4

Pressure of fluid

Question 5

Why is the hydrostatic pressure higher in the arterial end compared to venous end?

Answer 5

• reduction of blood volume at arterial end due to water molecules leaving capillary
• friction of capillary walls slows blood down

Question 6

Why is the osmotic pressure at the venous end higher than at the arterial end?

Answer 6

Tissue fluid leaves capillaries at arterial end so remaining solutes are more concentrated and water concentration is reduced

Question 7

What percentage of tissue fluid enters back into the blood?

Answer 7

90%

Question 8

What happens to the remaining 10% excess tissue fluid?

Answer 8

Returned to the blood by the lymphatic system and is now called lymph

Question 9

What is the lymphatic system?

Answer 9

Extensive network of blunt ended vessels and nodes

Question 10

What is the role of the spleen?

Answer 10

Contains emergency supply of blood and white blood cells