DAT bio question~

[ippie]

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which of the following factors will not influence the amount of oxygen delivered to body tissues?

a. surface area of the red blodd cells
b. blood pressure
c. surface area of the alveoli
d. rate of respiration

what's the difference between positive breathing and negative breathing?

 

[vize]

I would say the first answer to your question is B, blood pressure. Not sure though.. and isn't positive and negative breathing just inhaling and exhaling? heh

 

[RozhonDDS]

a

 

[vize]

Oops, yeah, you're right! Decreasing the surface area of red blood cells would decrease the amount of oxygen exchanged by the hemoglobin!

 

[Notoriousjae]

A seems right.

 

[SF85tea]

i would say the answer is A because only red blood cells transport the oxygen directly to tissue. every others are indirect

 

[bluesdeluxe]

Can anyone explain why this is right?

I want to say surface area has nothing to do with oxygen binding....I want to recall that O binds to Fe atoms in a specific way within hemoglobin and therefore it's the binding properties of Fe and not the physical surface area (is it 4 oxygens to one Fe?).

Seems to be if you decrease the lungs surface area to zero, no oxygen would be transfered...surface area in lungs does affect oxygen gettting to cells

Same goes for blood pressure....if it drops to zero no gas exchange

and rate of resp seems like if it's zero no exchange

This leaves A as a decent answer. Anyone know if my thinking is right?

 

[MansonTiles]

it says which DOES NOT influence....and the answer is B.

blood pressure has no efect on how much O2 gets delivered.
pretty sure its B, the rest all DO influence.

 

[hpets]

i thought RBCs were shaped in their little indented way to increase surface area to make it a better O carrier...so wouldn't surface area matter? Is B the answer?

 

[bluesdeluxe]

It seems to me that as blood pressure increases, less oxygen bound blood is able to travel through the circ system and therefore less oxygen is delivered. Isn't this the reason people with Hyperextention are often left out of breath?

I'm not sure that a person with good genetic coding for hemoglobin can in fact increase or decrease the surface area of their blood. Seems like that is something fairly set in genetic stone. Obviously smoking and lung problems can decrease the surface area of the lungs....seems like it has to be A

 

[Chga]

what about sickle cell... 😕

 

[FatalExtraction]

i would think it's B...hemoglobin is a protein complex - theres a difference between anemias which are a consequence of this complex in blood cells that aren't able to bind O2 as efficiently vs. having a surface area which enables an RBC to maximize its area of gas exchange with nearby tissues...blood pressure on the other hand (which if i remember correctly is just the pressure exerted on the walls of the arteries by the blood) wouldn't directly affect one's tissues acquiring enough oxygen...it would be the amount of blood sent to the tissues that would determine this

that's how i would come to my answer which makes sense to me...but if it's wrong then could someone explain it to us? thanks =)

 

[bobu]

hi all,
i am new here. I think the answer is B. It can not be A b/c that is what happen with person has sickle cell. for second part, not on my head now. love to hear some one tell
thanks
Grad Spr 2007
GPA 3.2
SC 3.57

 

[Orthodox Bear]

answer is b

 

[bobu]

common sense is that if you want to bind on st, you need place to bind . you right about O bind to Fe. but where are those Fe located. is it on the blood cell 's suface?
It must be the max O can be carried by the hemoglobin and also the anount of blood come to tissuses.

very simple, you do not have to make complicate for these question
thanks

 

[ippie]

I am the person who posted this bio question.
The answer is B.
However, I still don't know why blood pressure has nothing to do with amount of oxygen carried. The high blood pressure means the high blood volume. The high blood volume contains great amount of RBC. The great amount of RBC can carry the great amount of oxygen. Am I wrong?
Can anybody explain on what point I am wrong?