3 bio questions

[Keroro]

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when your muscle is relaxed, it is experiencing a state of


A. non contraction whatsoever
B. partial contraction called tonus
C. Isometric contraction frequencies
D. Isotetric contractions
E. Tetanus




-> answer is B


but why?
so our muscle never relaxes completely?
always have a partial contraction called tonus?



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a large amount of which of the following will decrease membrane fludity?

A. unsaturated fatty acid.
B. cholesterol
C. saturated fatty acid.
D. A and B
E. B and C


-> answer is E

but why large amount of unsaturated fatty acid do not decrease the membrane fluidty?


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the force manily responsible for the ultrafiltrate formed from a capillary is

A. osmotic pressure
B. hydrostatic pressure caused by the pumping of the heart
C. pressure seen also in veins
D. more than one of the above
E. none of the above

-> answer is B




but what is "ultrafiltrate" formed froma capillary?

and how hydrostatic pressre is responsible for that?






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studying bio is like pouring water into broken jar ..

help me!

 

[hoabangkhuang]

hey seriously where u get these kind of questions?

 

[Keroro]

i got a cd from superdatprep.com

 

[Envision]

yes, your muscles never fully relax. during contractions, your muscles will display "active" tension. during relaxation, your muscles will still have passive tension, which is simply the slight pull of the muscles in their resting state. as for the other question, im not sure.

 

[tinman831]

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a large amount of which of the following will decrease membrane fludity?

A. unsaturated fatty acid.
B. cholesterol
C. saturated fatty acid.
D. A and B
E. B and C


-> answer is E

but why large amount of unsaturated fatty acid do not decrease the membrane fluidty?


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Unsaturated fatty acids have double bonds in the tails that reduce the packing together of fatty acid molecules. This causes the membrane to be less stable and more fluid.

 

[allstardentist]

Unsaturated fatty acids have double bonds in the tails that reduce the packing together of fatty acid molecules. This causes the membrane to be less stable and more fluid.

👍 👍

 

[tinman831]

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the force manily responsible for the ultrafiltrate formed from a capillary is

A. osmotic pressure
B. hydrostatic pressure caused by the pumping of the heart
C. pressure seen also in veins
D. more than one of the above
E. none of the above

-> answer is B




but what is "ultrafiltrate" formed froma capillary?

and how hydrostatic pressre is responsible for that?






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I think ultrafiltrate is due to the semipermeability of the capillary wall. Hydrostatic pressure caused by the beating of the heart forces water and small solutes from the blood across the wall of the capillary forming an ultrafiltrate. The larger MW items are retained in the blood.