Unit 3 - Tissue fluid Flashcards Preview

LGS A-Level OCR Biology > Unit 3 - Tissue fluid > Flashcards

Flashcards in Unit 3 - Tissue fluid Deck (17)
Loading flashcards...
1
Q

What is lymph?

A

Modified tissue fluid that is collected in the lymph system

2
Q

What is tissue fluid?

A

A liquid produced from the circulatory system which contains dissolved nutrients

3
Q

What is the function of tissue fluid?

A
  • Transports substances to the tissues and returns waste products of the cells back to the circulatory system
  • bathes cells which protects cells
  • allows the cells to take up the products needed
4
Q

Give 3 examples of substances found dissolved in tissue fluid

A

Glucose
Amino Acids
Oxygen
Carbon Dioxide

5
Q

What is the lymphatic system?

A
  • system that contains drainage vessel for excess tissue fluid
  • fluid in vessels known as lymphatic fluid
6
Q

What are the functions of lymph nodes?

A

Involved in immune response and contain lymphocytes

7
Q

What happens to excess tissue fluid?

A

Drains into lymph vessels

Some tissue fluid returns to capillaries

8
Q

What is the function of pores in capillaries?

A
  • allows tissue fluid to leave capillaries

- do not allow blood cells or large proteins out of the blood

9
Q

What is hydrostatic pressure?

A

The pressure created by water in an enclosed system

10
Q

What is oncotic pressure?

A

The pressure caused by the tendency of water to move into blood by osmosis as a result of plasma proteins

11
Q

Why does hydrostatic pressure fall as blood and tissue fluid move through the capillaries?

A

-due to increased distance from the heart and branching of the arterioles into many capillaries

12
Q

Why does oncotic pressure stay the same throughout the capillaries?

A

The plasma proteins in the blood which generate the pressure are too large to fit through capillary pores

13
Q

Why does tissue fluid move in and out of capillaries?

A

Due to opposing blood pressures

14
Q

In what direction does tissue fluid move at the arteriole end of the capillary?

A

Out of the capillary

15
Q

Why is tissue fluid forced out of the capillary at the arteriole end?

A
  • The Hydrostatic pressure is greater than the oncotic pressure so tissue fluid is forced out of the blood
  • down a pressure gradient
16
Q

In what direction does tissue fluid move at the venous end of the capillary?

A

Drawn into the capillary

17
Q

Why is tissue fluid drawn into the capillary at the venous end?

A

The oncotic pressure is greater than the hydrostatic pressure so tissue fluid is drawn into the blood
-down a pressure gradient