Biology; Chemistry; Physics: Post your doubts here!

[funky brat]

though there is something known as sphincters in cappilaries I think but we were supposed to ignore them probably

But why?
How do we know what the examiners are trying to ask? They must keep everything in consideration when they make an MCQ.

 

[funky brat]

it is but very rarely
I have only found it wrong twice

Would you like to mention where it was wrong?

 

[Faizan Muhammmad]

But why?
How do we know what the examiners are trying to ask? They must keep everything in consideration when they make an MCQ.

ussually happened long ago
this oct/nov a chm question was conflictory they cancelled it

 

[Faizan Muhammmad]

Would you like to mention where it was wrong?

once in physics left hand rule was wrongly applied
once in EM a numerical answer was wrong
both early papers

 

[Dark Destination]

ussually happened long ago
this oct/nov a chm question was conflictory they cancelled it

Chemistry?
Which one?

 

[funky brat]

ussually happened long ago
this oct/nov a chm question was conflictory they cancelled it

Okay.
Do arteries and arterioles constrict only? Why can't capillaries?

 

[***amd***]

Okay.
Do arteries and arterioles constrict only? Why can't capillaries?

coz capillaries have single celled walls. they r not muscular.

 

[Faizan Muhammmad]

Chemistry?
Which one?

p1 q19 in one variant and 39 in other i think
eutrophication one

 

[Faizan Muhammmad]

Okay.
Do arteries and arterioles constrict only? Why can't capillaries?

how will they just one cell thick

 

[Dark Destination]

p1 q19 in one variant and 39 in other i think
eutrophication one

Okay.

 

[Awesome12]

coz capillaries have single celled walls. they r not muscular.

Wait a minute, so it means that at the surface of the skin, the arterioles are dilating/constricting rather than the capillaries?

 

[Dark Destination]

coz capillaries have single celled walls. they r not muscular.

Nice, maths master.

 

[funky brat]

p1 q19 in one variant and 39 in other i think
eutrophication one

Yeah, eutrophication one. I saw one MCQ that was removed too.

 

[funky brat]

Wait a minute, so it means that at the surface of the skin, the arterioles are dilating/constricting rather than the capillaries?

Yeah, definitely. They send in less/more blood that passes through the capillaries. Capillaries do nothing, they sit back and relax and confuse kids.

 

[♣♠ Magnanimous ♣♠]

Wait a minute, so it means that at the surface of the skin, the arterioles are dilating/constricting rather than the capillaries?

wiki says --> Vasodilation (or vasodilatation) refers to the widening of blood vessels.[1] It results from relaxation of smooth muscle cells within the vessel walls, in particular in the large veins, large arteries, and smaller arterioles

 

[***amd***]

Wait a minute, so it means that at the surface of the skin, the arterioles are dilating/constricting rather than the capillaries?

oyeeeeeeeeeeee!!!!!!! capillaries have a v narrow lumen, even sometimes RBCs have to bend to pass through them. so why would they be felt on the skin?
and yes y are right, its artrioles which contract and cause pulse.

 

[Faizan Muhammmad]

oyeeeeeeeeeeee!!!!!!! capillaries have a v narrow lumen, even sometimes RBCs have to bend to pass through them. so why would they be felt on the skin?
and yes y are right, its artrioles which contract and cause pulse.

now wait a minute
heart caused pulse

 

[***amd***]

cam some1 tell me some examples of Hallucinogens?

 

[♣♠ Magnanimous ♣♠]

oyeeeeeeeeeeee!!!!!!! capillaries have a v narrow lumen, even sometimes RBCs have to bend to pass through them. so why would they be felt on the skin?
and yes y are right, its artrioles which contract and cause pulse.

wiki too says -->

• Yes. Capillaries do constrict known as vaso constriction. This is when the body gets cold therefore the capillaries constrict so that no heat is lost through the skin. Capillaries also dilate, this is when the body is too warm. They dilate which means the blood comes to the surface and heat is lost by diffusion through the skin and into the atmosphere.

 

[***amd***]

now wait a minute
heart caused pulse

yes but it is carried on by the muscular walls of artries. u know, like, they are much into body building

 

[funky brat]

cam some1 tell me some examples of Hallucinogens?

Do you need to know the names? Has it been asked anywhere in the papers?