EBK HUMAN BIOLOGY
11th Edition
ISBN: 8220100545931
Author: MCMILLAN
Publisher: Cengage Learning US
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Textbook Question
Chapter 8, Problem 5SQ
Which of the following statements about red blood cells is false?
- a. They live about 120 days before being replaced.
- b. They lack a nucleus and other organelles when they are mature.
- c. They are replaced when the hormone EPO stimulates stem cells in bone marrow.
- d. They are replaced as part of a negative feedback loop in which kidney cells monitor blood oxygen levels
- e. All the above statements are true except b, because all cells require a nucleus in order to function properly.
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Which of the following sudden changes might be a result of an infection?
a. increase in the activity of white blood cells
b. decrease in the activity of antigens produced by the mitochondria
c. decrease in the amount of DNA present in the nuclei of cells
d. increase in the number of red blood cells
Cancer cells have a complex interaction with the cells of the immune system that are present in the stroma. The immune cells have the potential to destroy the tumor if it is recognized as aberrant tissue. Which one of the following statements correctly describes an interaction between cancer cells and the immune cells of the stroma?
A. Tumors stimulate formation of new blood vessels—angiogenesis—promoting tumor survival.
B. The tumor establishes an immunosuppressive environment by blocking white-cell activation.
C. Tumors invoke an inflammatory reaction that blocks entry of immune cells into the stroma.
D. Immune cells block tumor growth by providing signals that inhibit cancer cell proliferation.
A experiment in which cancer cells were injected into the vein leading to the liver demonstrated:
Select one:
a.
Very few cancer cells were trapped in the capillary bed of the liver
b.
Many cancer cells were trapped in the capillary bed but most of them were not able to escape the blood into the tissues.
c.
Most of the cancer cells were trapped in the capillary bed but only a small percentage formed macrometastases
d.
Many cancer cells were trapped in the capillary bed and most of these became macrometastases.
Chapter 8 Solutions
EBK HUMAN BIOLOGY
Ch. 8 - Prob. 1RQCh. 8 - What are the cellular components of blood? Where...Ch. 8 - Prob. 3RQCh. 8 - What is an agglutination response? How can it be...Ch. 8 - Prob. 5RQCh. 8 - Prob. 1SQCh. 8 - Prob. 2SQCh. 8 - Prob. 3SQCh. 8 - In the lungs, the main factor in boosting the...Ch. 8 - Which of the following statements about red blood...
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