Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

A healthy student from the coastal city of Boston enrolls at a college in Boulder, Colorado, a mile above sea level. An analysis of her blood in her first months at college would show:

a. decreased macrophage activity.

b. increased secretion of erythropoietin by the kidneys.

c. increased signaling ability of platelets.

d. anemia caused by malfunctioning erythrocytes.

e. increased mitosis of leukocytes.

Summary Introduction


Blood is the body fluid that contains blood cells suspended in blood plasma. It transports nutrients, gases, and salts within the body. It also maintains body homeostasis with the external environment. Types of blood cells are erythrocytes, leukocytes, and blood platelets.


Justification/explanation for the correct answer:

Option (b) is, increased secretion of erythropoietin with the help of kidneys cells. Kidney secretes erythropoietin hormones from kidney cells in response to a drop in the oxygen-carrying capacity of blood. A person moving to higher altitudes have a greater risk of blood loss and its ability to carry oxygen in a body. The negative feedback mechanisms stabilize the number of erythrocytes with oxygen carrying capacity of blood. Hence, option (b) is correct.

Explanation for the incorrect answers:

Option (a) is given as decreased macrophage activity. The macrophage cells are produced from the myeloid stem cells. They help in digestion of dead cells. The level of these cells remains the same in a person moving to higher sea level. So, it is an incorrect option.

Option (c) is given as increased signaling ability of blood platelets...

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