blood; tissue fluid; lymph Flashcards
(14 cards)
1
Q
What are platelets?
A
- Fragments of large cells called megakaryocytes
2
Q
What substances are carried in the plasma?
A
- glucose and AAs
- mineral ions
- hormones
- large plasma proteins (incl. albumin which maintains osmotic potential)
- fibrinogen
- globulins
3
Q
how is TF formed?
A
- Hydrostatic pressure exceeds oncotic pressure at the arterial end.
- Substances dissolved in plasma forced out of the fenestrations.
- Fluid fills spaces between the cells.
4
Q
What is oncotic pressure?
A
Oncotic pressure is the tendency of water to move into the blood by osmosis.
5
Q
What percentage of tissue fluid is reabsorbed?
A
90%
6
Q
Where does the remaining 20% of tissue fluid go?
A
drains into the lymph capillaries.
7
Q
How can the lymph capillaries be described?
A
- blind-ended
8
Q
What can be said about the composition of lymph relative to plasma and TF?
A
- Less oxygen and fewer nutrients
9
Q
How do FAs enter lymph?
A
- Through the villi of the small intestine.
10
Q
How is fluid in lymph vessels moved?
A
By the contraction/squeezing of body muscles
11
Q
In what way are lymph vessels similarly structured to veins?
A
both have valves
12
Q
How does lymph return to the blood?
A
- left and right subclavian veins
13
Q
What is the function of lymph nodes?
A
- intercept bacteria and other debris from lymph, which are ingested by phagocytes found in the nodes.
- lymphocytes are present and can produce anitbodies
14
Q
A
