Which of the following is NOT an example of homeostasis?
a
During rigorous exercise the heart rate increases to deliver more blood to the cells.
b
When body temperature rises, nerve impulses cause sweat glands to release more sweat.
c
As humans age, they become more susceptible to disease and cancer.
d
When blood glucose is high, the hormone insulin reduces blood glucose.
c
As humans age, they become more susceptible to disease and cancer.
To determine which of the options is NOT an example of homeostasis, let's first understand what homeostasis is. Homeostasis is the body's ability to maintain stable internal conditions regardless of external changes.
Now, let's analyze each option:
a) During rigorous exercise, the heart rate increases to deliver more blood to the cells. This is an example of homeostasis because the body is responding to the increased demand for oxygen and nutrients by adjusting the heart rate to maintain balance.
b) When body temperature rises, nerve impulses cause sweat glands to release more sweat. This is also an example of homeostasis. The body responds to high body temperature by promoting sweating, which helps to cool down and maintain a stable body temperature.
c) As humans age, they become more susceptible to disease and cancer. This option does not directly relate to homeostasis. Aging and increased susceptibility to diseases are more related to the natural processes of aging rather than the body's ability to maintain internal stability.
d) When blood glucose is high, the hormone insulin reduces blood glucose. This is an example of homeostasis. Insulin acts to regulate blood sugar levels by promoting the uptake of glucose into cells, thus restoring the balance.
Based on the explanations above, option c ("As humans age, they become more susceptible to disease and cancer") is the correct answer because it does not directly align with the concept of homeostasis.