Life: The Science of Biology
11th Edition
ISBN: 9781319010164
Author: David E. Sadava, David M. Hillis, H. Craig Heller, Sally D. Hacker
Publisher: W. H. Freeman
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Chapter 48.4, Problem 1R
Summary Introduction
To review:
The significance of fully saturation of hemoglobin with oxygen at 100 mmHg partial pressure of oxygen (PO2) and return to heart in the venous blood at 40 mmHg PO2, reflecting 75% of saturation.
Introduction:
The partial pressure of the gas is defined as the part of the volume occupied by that particular gas in the mixture of the gases. In the atmosphere, the oxygen occupies 21% of the total gases present in the atmosphere. The PO2 at the sea level is nearly 159 mmHg. The hemoglobin is a protein that functions as the carrier of the oxygen in the body.
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Calculate the fractional saturation for hemoglobin when the partial pressure of oxygen is 80 mm Hg. Assume hemoglobin is 50% saturated with oxygen at a partial pressure of 24 mm Hg and that the Hill coefficient is 3.
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Chapter 48 Solutions
Life: The Science of Biology
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- Describe the relationship between the partial pressure of oxygen and the binding of oxygen to hemoglobin.arrow_forwardHow does hemoglobin help maintain the oxygen partial pressure gradient during gas transport in the body?arrow_forwardWhat effect does hyperventilation have on blood pH and why? What simple measure can be used to correct the pH imbalance and how does it work? What effect would hyperventilation have on hemoglobin O2 saturation in a normal healthy individual? What effect would a PaO2 of 60 mmHg have on hemoglobin O2 saturation and why? (explain in terms of the O2-Hb dissociation curve)arrow_forward
- The partial pressure of oxygen in the venous blood of a human at rest at sea level is approximately 40 torrs a.) Calculate the fractional saturation of hemoglobin under these conditionsb.) What percentage of the oxygen originally bound to hemoglobin in the alveoli remained unreleased?c.) Is the residual oxygen bound to hemoglobin under these conditions of any benefit? Explainarrow_forwardWhich hemoglobin has a higher affinity for O2 at the tissue pO2 of around 4 kPa?arrow_forwardAfter spending a day or more at high altitude (with an oxygen partial pressure of 75 torr), the concentration of 2,3- bisphosphoglycerate (2,3-BPG) in red blood cells increases. What effect would an increased concentration of 2,3-BPG have on the oxygen-binding curve for hemoglobin? Why would this adaptation be beneficial for functioning well at high altitude?arrow_forward
- Considering the quantity of hemoglobin in an erythrocyte and the oxygen-binding properties of hemoglobin, calculate how many molecules of oxygen one erythrocyte could carry?arrow_forwardUse the Hill Equation to determine the fractional saturation of hemoglobin in equilibrium with blood that has a partial pressure of 1.9 mmHg.arrow_forwardSuppose you visit the Dalai Lama in Dharamsala, India (elevation 1460 m),and you begin to ponder the “big questions,” such as “What is the fractionalsaturation of the Dalai Lama’s hemoglobin?”(a) Assuming the Dalai Lama’s hemoglobin has a Hill coefficient = 3.2,and a P50 = 31 mm Hg, calculate the change in fractional O2 saturationof his hemoglobin going from his lungs (where PO2 = 85 mm Hg) to hiscapillaries (where PO2 = 25 mm Hg).(b) Why do you suppose the Dalai Lama’s hemoglobin has a P50 higher thannormal (where “normal” = 27 mm Hg)?arrow_forward
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