physio/biochem questions ???

[cutedoc12]

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can anyone explain the following questions...

1.compared to skeletal muscle contraction smooth ms contraction....can be maintained for a longer time.

2.a number of catabolic pathways are allosterically inhibited by an increase in the concentration of......ATP.

3.both systemic and pulmonary circulation have the same
pulse pressure
flow rate

4.the maximum urine concentration that can be produced is MOST closely related to .....length of the loop of henle

5.pieces of dog parotid gland and pancreas are transplanted under the skin of the donor animal.after re-establishment of the circulation ingestion of food will result in secretion from which of following ?
parotid and pancreatic transplants
the fragment of pancreas only
the fragment of parotid only
neither fragment

6. the continous flow of blood in arteries during diastole is made possible by ......energy stored in arteries during systole.[

 

[rox]

3. Bloof flow rate(Q) to both circulations is equal naturally...PP for the systemic circulation = 120-80 while for the pulmonary circulation euals something like 25-10=15.

4. The deeper the more concentrated becomes the surrounding of the loops.

 

[cutedoc12]

soooo many viewers and only one reply ?????

 

[dontwantaids]

2. catabolic pathways generally tend to add atp to the system (e.g. glycolysis, a catabolic pathway for glucose, produces 8 atps per mole of glucose). so when atp is present in sufficient ammount, it will tend to decrease further production of atp, allowing biomolecules to be stored for future use (when the supply of atp becomes short). On the other hand, high level of AMP or ADP (produced by anabolic pathways) indicate low energy status, and will allosterically inhibit anabolism. This is negative feedback, and thats how most systems of our body function

 

[instigata]

1.compared to skeletal muscle contraction smooth ms contraction....can be maintained for a longer time.


The ATPase activity in the Skeletal muscle works at a rate about 10 times that of the ATPase found in sm.

I think there may be another reason, but from what I remember this is the primary reason for the difference.

 

[cutedoc12]

thanx a lot to all who replied.....

 

[eatkabab]

can anyone explain the following questions...


5.pieces of dog parotid gland and pancreas are transplanted under the skin of the donor animal.after re-establishment of the circulation ingestion of food will result in secretion from which of following ?
parotid and pancreatic transplants
the fragment of pancreas only
the fragment of parotid only
neither fragment
.[

what on earth is this one?! I can't find this experiment in any text anywhere?!! those bastards

 

[coralis]

Parotid secretions are induced by CN IX. No response to hormones
Pancreatic secretions are induced by hormones.

Thus after sub-dermal transplant and re-establishment of circulation, only the pancreas would be stimulated.

 

[coralis]

For question 6 there is a section in BRS physio 4th edition, pg 99 on coronary circulation that states: during systole, mechanical compression of the coronary vessels reduces blood flow. After the occlusion is relived --> by reactive hyperemia blood flow will increase in order to repay the perceived O2 debt.