Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 36, Problem 10TY
Summary Introduction

Introduction:

Hemoglobin is a molecule in red blood cells that carry the oxygen in the blood. It carries oxygen from the lungs to the whole body and returns carbon dioxide to the lungs.

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Which of the following statements about oxygen transport is TRUE. Increases in temperature and decreases in pH cause myoglobin to release oxygen to improve delivery to the hemoglobin in muscles. A molecule of myoglobin has higher oxygen binding capacity than a molecule of hemoglobin. Myoglobin has a higher oxygen affinity than does hemoglobin. Fetal hemoglobin has a lower affinity for oxygen than maternal hemoglobin, which makes it better suited to extract oxygen from the maternal circulation.
Myoglobin would be an inappropriate carrier of oxygen to peripheral tissues because: Myoglobin exists in the T, or deoxy state, in muscle tissue. Myoglobin would not release oxygen at the oxygen pressures found in muscle tissue. Myoglobin has lower affinity and would lose the oxygen to hemoglobin during transport. Myoglobin is only soluble in plasma. Two of the above.
Chemical and physical properties of gases are important factors in the evolution and physiology of cardiorespiratory systems. Which of the following statements about gases and cardiorespiratory systems is FALSE? When a frog sits in anoxic water, they can get enough oxygen by breathing air. Under these conditions, it makes sense to reduce the blood flow through the skin to reduce loss of oxygen from the blood to the water. When ancient fish began breathing air, they discovered that air was respiratory fluid that was richer in oxygen than was the water they breathed when submerged. When humans climb to high altitude, they breath more frequently to obtain sufficient oxygen and in doing so, get rid of too much carbon dioxide, causing an alkalosis (increase in blood pH). Because the ratio of oxygen to carbon dioxide is higher air than water, air breathing is linked to getting enough oxygen whereas water breathing is regulated to get rid of carbon dioxide.
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