AAMC Self Assessment Bio Question (included)

[nabilesmail]

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Pretty much they ask which animal will have the densest bones?

I eliminated reptiles and birds, the remaining choices were land mammals and aquatic mammals.

I figured that whales dive really deep and all the water pressure must be tough on the bones! But apparently land mammals have stronger bones

there answer has to do with partial gravity in water or something


2nd question- Which of the following would NOT increase oxygenation of blood in the pulmonary circulation?

A) rate/depth of breathing
B)Hemoglobin conc. in blood
C)blood pressure in pulmonary artery
d)surface area of alveoli

I chose B because I swear Ihad another question like this in another FL (not by AAMC) and I got it wrong because, Hemoglobin Conc. in the BLOOD is very LOW, the conc. in the RBC is where its at :/

 

[MedPR]

Pretty much they ask which animal will have the densest bones?

I eliminated reptiles and birds, the remaining choices were land mammals and aquatic mammals.

I figured that whales dive really deep and all the water pressure must be tough on the bones! But apparently land mammals have stronger bones

there answer has to do with partial gravity in water or something


2nd question- Which of the following would NOT increase oxygenation of blood in the pulmonary circulation?

A) rate/depth of breathing
B)Hemoglobin conc. in blood
C)blood pressure in pulmonary artery
d)surface area of alveoli

I chose B because I swear Ihad another question like this in another FL (not by AAMC) and I got it wrong because, Hemoglobin Conc. in the BLOOD is very LOW, the conc. in the RBC is where its at :/

Hb is in the blood. I'm confused why you're confused 🙁

 

[nabilesmail]

Hb is in the blood. I'm confused why you're confused 🙁

Hahaha, I'm confused because I had a similar question in an other source and I got it wrong because supposedly there is little hemoglobin in the actual plasma of blood, rather it is all inside the red blood cells

 

[uoguelph]

Well in terms of the bones, a whale for example can't be too heavy or else it won't float. The water also support's it's weight so the skeleton doesn't have to. It's just the way they evolved.

For your second question, the pulmonary artery is the only artery in the body that carries deoxygenated blood, if the blood pressure is too high the oxygen will not be able to bind to hemoglobin in the capillaries. This question is pretty tricky but that's what I think.

 

[uoguelph]

Hahaha, I'm confused because I had a similar question in an other source and I got it wrong because supposedly there is little hemoglobin in the actual plasma of blood, rather it is all inside the red blood cells

Yeap that's correct hemoglobin is an oxygen-transport metalloprotein located in erythrocytes, most of the erythrocyte's protein content is hemoglobin.

 

[Postictal Raiden]

Pretty much they ask which animal will have the densest bones?

I eliminated reptiles and birds, the remaining choices were land mammals and aquatic mammals.

I figured that whales dive really deep and all the water pressure must be tough on the bones! But apparently land mammals have stronger bones

there answer has to do with partial gravity in water or something


2nd question- Which of the following would NOT increase oxygenation of blood in the pulmonary circulation?

A) rate/depth of breathing
B)Hemoglobin conc. in blood
C)blood pressure in pulmonary artery
d)surface area of alveoli

I chose B because I swear Ihad another question like this in another FL (not by AAMC) and I got it wrong because, Hemoglobin Conc. in the BLOOD is very LOW, the conc. in the RBC is where its at :/

The second question could be done by process of elimination.

A and D can be eliminated for the obvious reasons (ie. increasing the rate of gas diffusion). Once you think of athletes and blood doping, you can eliminate B. That leaves C.

 

[sciencebooks]

Pretty much they ask which animal will have the densest bones?

I eliminated reptiles and birds, the remaining choices were land mammals and aquatic mammals.

I figured that whales dive really deep and all the water pressure must be tough on the bones! But apparently land mammals have stronger bones

there answer has to do with partial gravity in water or something


2nd question- Which of the following would NOT increase oxygenation of blood in the pulmonary circulation?

A) rate/depth of breathing
B)Hemoglobin conc. in blood
C)blood pressure in pulmonary artery
d)surface area of alveoli

I chose B because I swear Ihad another question like this in another FL (not by AAMC) and I got it wrong because, Hemoglobin Conc. in the BLOOD is very LOW, the conc. in the RBC is where its at :/

I think everyone's covered it, but the way I thought of it was... (1) Less dense bones would also them to raise in water. If they were really dense, they'd probably sink more... (2) POE also. A, B, and D out. The answer was C, right? Even when I do POE, I try to think if the one I'm down to is right and for C, the pulmonary artery has oxygenated.

 

[sciencebooks]

The second question could be done by process of elimination.

A and D can be eliminated for the obvious reasons (ie. increasing the rate of gas diffusion). Once you think of athletes and blood doping, you can eliminate B. That leaves D.

Hahaha, salaam, I like your "ibn" name. But you put D twice, 😉.

 

[Postictal Raiden]

Hahaha, salaam, I like your "ibn" name. But you put D twice, 😉.

oops, I meant C.

Salam 😉

 

[nabilesmail]

Ahh I see, thanks guys

 

[MedPR]

I think everyone's covered it, but the way I thought of it was... (1) Less dense bones would also them to raise in water. If they were really dense, they'd probably sink more... (2) POE also. A, B, and D out. The answer was C, right? Even when I do POE, I try to think if the one I'm down to is right and for C, the pulmonary artery has deoxyganted. Higher pressure would slow the flow (Bernoulli's effect from physics) to the lungs where it would be getting oxygenated.

Actually if the blood was flowing more slowly, there would be more time for gas exchange and the PO2 would probably increase.

 

[sciencebooks]

Actually if the blood was flowing more slowly, there would be more time for gas exchange and the PO2 would probably increase.

But wouldn't we consider the right side of the heart to contain deoxygenated blood that needs to get to the lungs where oxygenation *primarily* occurs? I guess you're right that more time = more diffusion and oxygenation in that sense, but less dramatic compared to the other options. Like wouldn't the fact that it couldn't get to the lungs (even with slight increase in gas exchange via diffusion) be more detrimental than anything (since it wouldn't get the oxygen in the lungs)?

 

[MedPR]

But wouldn't we consider the right side of the heart to contain deoxygenated blood that needs to get to the lungs where oxygenation *primarily* occurs? I guess you're right that more time = more diffusion and oxygenation in that sense, but less dramatic compared to the other options. Like wouldn't the fact that it couldn't get to the lungs (even with slight increase in gas exchange via diffusion) be more detrimental than anything (since it wouldn't get the oxygen in the lungs)?

I was trying to hint to you that Bernoulli's does not apply to blood.

http://forums.studentdoctor.net/showpost.php?p=6695606&postcount=3 is a good explanation of it.

 

[sciencebooks]

I was trying to hint to you that Bernoulli's does not apply to blood.

http://forums.studentdoctor.net/showpost.php?p=6695606&postcount=3 is a good explanation of it.

Okay, thanks! I remember this kind of dawning on me while studying before when I thought about the fact that capillaries are thinner and have lower pressure, but I never exactly understood the discrepancy. This clears it up. So basically in the blood, when the area increases in the capillaries, the velocity decreases but the pressure also decreases. (Doesn't follow Bernoulli's because of non-ideal conditions). Helpful thread, 🙂.