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biology questions

only one question for now actually ^^

if the partial pressure of oxygen in the blood leaving the lungs is about 12.5kPa and the haemoglobin is about 95 per ent saturated, what volume of oxygen is present in 1dm^3 of blood
anyone?
Reply 1
Avatar for Malsy
Malsy
OP
18
OK

More q's:

The concentration of oxygen in the atmosphere is about 20 per cent and the atmospheric pressure at sea level is approximately 100kPa
therefore the partial pressure of oxygen in the atmosphere is about 20kPa. Why is it less than this in the air reaching the alveoli?

b)

What is the percentage of oxygen in the atmosphere of 5500m where the patial ressure of oxygen in the atmosphere is about 10kPa

c)
at 5500 m altitude the partial pressure of the oxygen in the air reaching the alveoli is about 5.5kPa
what effect would this have on the percentage saturation of haemoglobin leaving the lungs

5

a)
explain how the cow and horse might have quite different amino acid sequences in their beta chains
(on the table it shows they have the same number of different amino acids)

b) what is the minimum number of base pair that there must be in alleles for the beta chains



ANY HELP APPRECIATED.

REP AVAILABLE.
Reply 2
Avatar for shungun
shungun
1
well for your forst question: each haemoglobin molecule can carry 4 oxygen molecules. and one mole of oxygen occupies 24dm^3 at RTP...so i guess you can calculate. the approximate volume of one erythrocyte is:
90*10^-17 m^3 so convert this to dm^3 and then assume only erythrocytes are present...

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