7.6 - Blood, Tissue Fluid & Lymph Flashcards
The composition and functions of blood How tissue fluid forms from plasma The composition and role of lymph (15 cards)
What is blood?
Fluid that transports substances around circulatory system
What does blood consist of?
4 things
- Plasma - Mostly water, transports substances in solution.
- Red blood cells - Carry oxygen.
- White blood cells - Immune cells.
- Platelets - Involved in clotting.
What are the functions of blood?
Transports:
- oxygen
- carbon dioxide
- nutrients
- waste
- hormones
- food
- clotting factors
What is tissue fluid?
Fluid filling spaces between cells (interstitial space)
What is the function of tissue fluid?
- Site of diffusion between blood and body cells providing cells with nutrients and oxygen while removing waste products
- Helps fight infection as it forms part of the immune response.
How does tissue fluid differ from plasma?
3 ways
- No red blood cells
- fewer proteins
- fewer white blood cells
How is tissue fluid formed?
From blood flowing through capillaries
What happens at the arteriole end of capillaries?
High hydrostatic pressure forces fluid out
What happens at the venule end of capillaries?
4 key things
- Hydrostatic pressure lower
- oncotic pressure higher
- water potential lower
- tissue fluid moves back in
What is lymph?
Fluid that flows around lymphatic system
How does lymph differ from tissue fluid?
3 ways
- Less oxygen and nutrients
- more fatty acids
- more lymphocytes
How is lymph formed?
- Some tissue fluid doesn’t re-enter capillaries from tissue fluid.
- This fluid instead drains into lymph vessels (lymph capillaries) forming lymph.
How is lymph transported?
Through what AND how
Through lymphatic system via muscle contractions
What filters pathogens from lymph?
Lymph nodes
Where does lymph eventually return to?
Blood
