pls help- URGENT!!!

[twinkle]

hey there just wanted 2 knw if sum1 out der cud jst help wit a few questions

1. what happens 2 mucus wen it is swallowed?

2. How does the skin repair itself?
* i know the blood clots at the surface of a cut and leucocytes start to form a scab, but what else happens-

3. how does the lymphatic system work?
* i think this is specifically along the lines of producing antibodies etc.

thnx so so much!!

[unscientific]

I think the mucus is converted to saliva..as mucus is present in saliva to aid in peristalsis.

For the lymphatic system, it is a complex network of lymphoid organs, lymph nodes, lymph ducts, lymph tissues, lymph capillaries and lymph vessels that produce and transport lymph fluid from tissues to the circulatory system. The lymphatic system is a major component of the immune system.. It has 3 major functions:

removal of excess fluids from body tissues, absorption of fatty acids and subsequent transport of fat through the lacteal ( present in the ileum )
I guess thats all

Apologies as i forgot about the skin..I cant remember what I learnt about it though im sure i learnt about it before.

Cheers

[unscientific]

Ok i found the page of the bio book..
It says that blood exposed to air will soon clot due to oxidation. As we have a wound, bacteria is present. Therefore, the body's reaction is to send phagocytes to kill bacteria at the " battlefield " aka the wound area.
The lynphocytes in the blood soon produce antibodies which act as antioxins which neutralize the poisonous effect of the toxins. They help to kill bacteria too.
For the clotting of blood, it does not happen normally due to an anti-clotting substance heparin which is produced in the liver. When thrombokinase is released, it neutralises the action of heparin so that the clotting takes place. Serum is left behind when the blood clots.


------Summary--------

produce
(1) Wound ------------------> thrombokinase ( enzyme )

thrombokinase
(2) Prothrombin -------------------> thrombin ( active)
(Inactive) Ca2+ ions

thrombin
(3) Fibrinogen ------------------------> insoluble fibrin threads ( blood clot )

Hope this has helped u

[el diablo]

doesn't the mucus hjelp in neutralising bacteria?

[twinkle]

thanx so mush unscientific!

reaaly cool learnin all dat

tata