What Is Life? A Guide to Biology
4th Edition
ISBN: 9781319065454
Author: Jay Phelan
Publisher: W.H. Freeman & Co
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Chapter 22, Problem 10MC
Summary Introduction
Introduction:
Humans get accustomed to the oxygen levels at higher altitudes due to the production of more diphosphoglyceric acid.
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All of the following are accurate statements about hemoglobin except a. hemoglobin carries oxygen on the Fe ion. b. hemoglobin carries carbon dioxide on the globin. c. hemoglobin carries only a small portion of the total carbon dioxide in the blood (less than 25%). d. hemoglobin releases oxygen at the level of the cell, making hemoglobin more saturated.
Which of the following factors would increase the amount of oxygen discharged by hemoglobin to peripheral tissues?
a. decreased amounts of DPG
b. increased tissue PO2
c. decreased pH
d. decreased temperature
e. all of the above
Which of the following causes an increase in hemoglobin’s 02 affinity?
A. An increase in the partial pressure of oxygen.
B. A decrease in ph
C. An increase in the concentration of 2,3 -BPG
D. An increase in the partial pressure of carbon dioxide
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What Is Life? A Guide to Biology
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- Hemoglobin: A. binds either oxygen or carbon monoxide on its heme group B. molecules can each bind 4 oxygen molecules C. both molecules can each bind 4 oxygen molecules and binds either oxygen or carbon monoxide on its heme group D. molecules can each bind 4 oxygen molecules, and has a higher affinity for carbon dioxide E. has a higher affinity for carbon dioxide than for oxygenarrow_forwardWhich of the following is true about the proximal histidine of hemoglobin? A. It forms a hydrogen bond with bound oxygen. B. It is bonded to the Fe2+ atom coordinated by heme C. It binds oxygen D. It is not consumed in myoglobinarrow_forwardfactors that affect the unloading (releasing ) of oxygen more quickly from hemoglobin include all the following except a. increased pressure of CO2 b. elevated chlorine ions c. increased temp d. lowered pHarrow_forward
- O2 bound to hemoglobin: a. acts the same as physically dissolved oxygen b. Comes off the hemoglobin (dissociates) more easily as you increase the oxygen partial pressure c. exerts a partial pressure d. Comes off the hemoglobin (dissociates) more easily as you increase the acidity (decrease the pH) e. all the options are correct 2. Air convection in mammals is driven by a smaller pressure gradient than blood convection because: a. Bronchioles have a greater resistance to flow than arterioles b. bronchioles tend to have a smaller radius than arterioles and capillaries c. air is easier to move with pressure gradients than blood d. air generally travels farther in your body than does blood e. air is heavier than blood 3. The rate of diffusion of gases is NOT determined by which of the following? a. The area of the surface across which diffusion is occurring b. The mechanical energy…arrow_forwardWhich of the following situations occurs if a person's blood becomes more alkaline? A. Hemoglobin molecules retain less oxygen per heme group under alkaline conditions than they do at neutral pH or under acidic conditions. B. Hemoglobin molecules give up oxygen more readily under alkaline conditions than they do under neutral pH or under acidic conditions. C. Hemoglobin molecules change shape and begin to lose oxygen molecules. D. Hemoglobin molecules retain oxygen more readily under alkaline conditions than they do at neutral pH or under acidic conditions. E. There is no change in hemoglobin's oxygen-binding affinity under alkaline conditions when compared to blood at neutral pH or under acidic conditions.arrow_forwardWhich of the following describe(s) a characteristic or function of hemoglobin?a. Hemoglobin consists of four chains of amino acids.b. A hemoglobin molecule contains four iron ions to carry oxygen.c. In addition to transporting oxygen, hemoglobin molecules carry carbon dioxide and hydrogen ions.d. Hemoglobin is a protein found in all formed elements.e. There are four hemoglobin molecules in each red blood cell.arrow_forward
- If the blood lacked red blood cells but the lungs were functioning normally, A. The arterial PO2 would be normal. B. The oxygen content of arterial blood would be normal. C. Both A and B would apply. D. Neither A nor B would apply Which of the following would be most affected by a decrease in the affinity of hemoglobin for oxygen? A. Arterial PO2 B. Arterial percent oxyhemoglobin saturation C. Venous oxyhemoglobin saturation D. Arterial PCO2arrow_forwardWhich of the following are true? A. Peripheral Chemo receptors for O2 in H+ ions are found in the carotid and aortic bodies. B. Peripheral chemoreceptors for O2 and H+ ions are found only in the carotid body. C. Peripheral chemoreceptors for O2 and H+ ions are found only in the aortic body. D. O2 and CO2 are monitored in the medulla Choose the correct answerarrow_forwardIn order for oxygen to be transported an arterial blood it can a. All answers are correct b. attached to hemoglobin and float freely in the plasma c.attached to bicarbonate d. attached to hemoglobin e.float freely in the plasmaarrow_forward
- The oxyhemoglobin dissociation (saturation) curve shifts to the right as the blood becomes more acidic. Under these conditions answer the following. At a P O2 = 40 mmHg the percent saturation of hemoglobin __________ and the content of oxygen bound to hemoglobin ____________. A. Decreases; decreases B. Increases; increases C. Increases; decreases D. Decreases; increases E. Does not change; does not changearrow_forwardWhich is/are false? a. Carbaminohemoglobin is hemoglobin bound to carbon dioxide b. In the lungs, the oxyhemoglobin saturation curve undergoes a 'left shift' c. At a PO2 of 10 mmHg, there is more deoxyhemoglobin in blood that oxyhemoglobin d. Higher temperatures and lower pH cause hemoglobin to bind more readily with oxygen than in conditions of lower temperatures and higher pHarrow_forwardCarbon Dioxide is carried in the blood by all the following means except: a. dissolved in plasma b. as bicarbonate c. as carbonic acid d. bound to hemoglobin e. all of these methods are used to transport carbon dioxide in bloodarrow_forward
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