tissue fluid 4.6

Question 1

why blood plasma has a higher protein count than tissue fluids

Answer 1

proteins too large to pass out of the capillary

Question 2

why blood plasma has higher oxygen concentration than tissue fluid

Answer 2

tissue fluid has less oxygen because it is respired by the cells

Question 3

State how tissue fluid is formed.

Answer 3

high hydrostatic pressure forces fluid out of the capilleries

Question 4

Explain how tissue fluid is returned to capillaries

Answer 4

more protein in plasma than tissue fluid
plasma proteins are too large to pass out of capillary
oncotic pressure generated by proteins
fluid enters because oncotic pressure is greater than hydrostatic pressure

Question 5

Compare and contrast the transport of fluid in a vein with its transport in a lymph vessel

Answer 5

both: low pressure, valves, muscles squeezing to move fluid
faster flow in veins
heart causes mass flow in veins
flow to heart in veins but gland in lymph

Question 6

Explain why the production of tissue fluid is vital for cells in the human body.

Answer 6

supplies oxygen
removes CO2
therefore respiration can occur
and pH is controlled

Question 7

Describe what happens to the tissue fluid that is not reabsorbed into the blood capillary.

Answer 7

enters lymphatic vessels
returns to blood

Question 8

Lymphatic ducts remove proteins that are secreted by cells.
Explain how a blockage of a lymphatic duct could lead to lymphoedema.

Answer 8

proteins accumulate in tissue fluid
therefore oncotic pressure changes
therefore less fluid removed by cappileries