Enter your answer in the provided box. Hemoglobin, the...

Enter your answer in the provided box. Hemoglobin, the oxygen-transport protein, binds about 1.35 mL of oxygen per gram of the protein. The concentration of hemoglobin in normal blood is 150 g/L blood. Hemoglobin is about 95 percent saturated with O2 in the lungs and only 74 percent saturated with O2 in the capillaries. Calculate the volume of O2 released by hemoglobin when 143 mL of blood flows from the lungs to the capillaries. 7.15 mL

Transcript

00:04 All right, so we are told that hemoglobin, i'm going to abbreviate it as hemo, just to save the amount of writing i have to do, but hemoglobin binds 1 .35 milliliters of oxygen or o2 per gram of hemoglobin.

00:23 We're told that the blood concentration of hemoglobin is 150 grams per one meter of blood.

00:31 Now, we are also told that in the lungs, 95 % of the hemoglobin that is there is saturated with o2.

00:42 And in the capillaries, 74 % of the hemoglobin that's there is saturated with o2.

00:49 Now, if we have 143 milliliters of blood flowing from lungs to the capillaries, what is the volume of o2 lost? now the first thing i want to do is find out what volume of oxygen or o2 is present if hemoglobin is 100 % saturated.

01:13 So of all the hemoglobin that is in that 143 milliliters of blood is saturated with oxygen, how much do we have? and the way i'm going to do this is i'm going to use dimensional analysis, factor labeling, whatever you want to call it.

01:29 I'm going to start with a nice big line so i have some space to write.

01:34 And i like to start my dimensional analysis by figuring out what my goal is, what label do i want to end with or find.

01:44 In this case, i need to know the volume of o2 when we're fully saturated.

01:51 So i'm going to look for a conversion factor in here that involves the volume of o2.

01:57 And the first one i see is up here, that hemoglobin binds 1 .35 milliliters of oxygen per gram of hemoglobin.

02:09 So, i will start with that, that there is 1 .35, oh, not grams, 1 .35 milliliters of o2 for every one gram of hemoglobin.

02:30 So there's my first step.

02:33 Now eventually, i need to convert grams of hemoglobin into milliliters of blood because i want to know how much volume of oxygen is in this blood.

02:47 So the next conversion factor i'm going to use is that there is 150 grams of hemoglobin in one meter of blood.

03:00 So i can say i have 150 grams of hemoglobin in one liter of blood.

03:14 And now i have cancelled out grams of hemoglobin here and here.

03:22 Now i need to use the volume of blood that i'm given.

03:26 But this volume i'm given is in milliliters...

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