homeostasis

[monokekie]

i have two questions here:

1, what do the tight junctions between epithelial cells do?
2, why do endotherms keep their body temperatures at their high thermoneutral zone despite the fact that the temperatures compatible with life is about 0-40 degrees? is it because of the enzyme activities that run the best at their optical temperatures?

[ed_saifa]

Tight junctions prevent toxic materials from penetrating the tissue. 

[akira88]

For your second question, yes that's true. The biochemical processes that happen in the cell occur the most effectively at those temperatures, meaning optimum activity

[happyhappyland]

The higher the temperature, the more collisions the enzyme and subtrate molecules will have to form enzyme-substrate complex and catalyst reactions.

[monokekie]

thank you!````:)

[akira88]

thank you!````:)

No problem

[TrueLight]

i have two questions here:

1, what do the tight junctions between epithelial cells do?
2, why do endotherms keep their body temperatures at their high thermoneutral zone despite the fact that the temperatures compatible with life is about 0-40 degrees? is it because of the enzyme activities that run the best at their optical temperatures?

also regarding q1...tight junctions hold the epithelial cells together so that it acts as a barrier to entry from the environment... tight junctions are disrupted between epithelial cells during inflammation where neutrophils and the like squeeze through them to get to the site of infection.

[monokekie]

i have two questions here:

1, what do the tight junctions between epithelial cells do?
2, why do endotherms keep their body temperatures at their high thermoneutral zone despite the fact that the temperatures compatible with life is about 0-40 degrees? is it because of the enzyme activities that run the best at their optical temperatures?

also regarding q1...tight junctions hold the epithelial cells together so that it acts as a barrier to entry from the environment... tight junctions are disrupted between epithelial cells during inflammation where neutrophils and the like squeeze through them to get to the site of infection.

THANKS!!!