Question

Question 11
4 pts
All of the following are examples of maintaining homeostasis except:
O A drop in body temperature triggers shivering which generates heat; an increase in body temperature triggers
sweating which releases heat.
© By opening and closing pores in their leaves, plants continuously exchange oxygen and carbon dioxide with
the atmosphere.
O A cancerous tumor continues to grow larger and then metastasizes, spreading to new areas of the body.
O Feelings of hunger and then fullness affect the length of time between meals and quantity of food you eat,
keeping your weight near a "set point."
0 A sensor detects CO 2 levels in the blood and triggers an increase or decrease in the rate of breathing.

Answer 1

In biology, homeostasis refers to the mechanisms by which biological systems maintain an internal state of steady conditions. The state of homeostasis is fundamental to ensure the survival of biological systems.

• All of the examples above are biological responses for maintaining homeostasis EXCEPT a cancerous tumor continues to grow larger and then metastasizes, spreading to new areas of the body.

• In cancer, the homeostasis of the system is lost and then cancer cells proliferate in an uncontrolled fashion, thereby leading to metastasis.

• Normal cells lose their homeostasis and convert into cancer cells by accumulating mutations that lead to the inactivation of tumor suppressor genes and/or activation of oncogenes.

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