Monday 3 September 2012

CLARIFYING QNS:)

1) Does diffusion occur instantly?

Diffusion - matter are made up of particles that are always moving. Thus, answer is no.

2) Difference between ingestion & digestion?

Ingestion - process of "eating" of taking in nutrients.
Digestion - mechanical, chemical

*similarity: occur at the same time.

3) What does it mean for intestine to be convoluted

** increase surface area to volume ratio

4) What is the difference between bile & bile salts?

In our level, we can use both. Bile salts is in bile:)

5) Function of semi-lunar valve and tricuspid valve?

Tricuspid Valve (Right Hand Side) --> preventing the back-flow of blood from the right ventricle to the right atrium of the heart

6) Heavy smoking affect heart?

nicotine--> hardening of vessels
cholestrol gets trap in the vessels.

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