Questions: Now that you have seen the process of homeostasis, which of the other processes below do you think are under homeostatic control? a) Nerve signaling b) Breathing patterns c) The formation of platelets at the site of an injury d) Blood pH level e) I am finished!

The answer is d) Blood pH level.

Explanation for each option:

a) Nerve signaling: This process is not directly under homeostatic control. While nerve signaling is crucial for many bodily functions, it is not a process that is regulated by homeostasis in the same way as physiological parameters like temperature or pH.

b) Breathing patterns: While breathing is influenced by homeostatic mechanisms, such as the need to maintain oxygen and carbon dioxide levels in the blood, the patterns themselves are not directly under homeostatic control. Instead, they are adjusted in response to homeostatic needs.

c) The formation of platelets at the site of an injury: This process is part of the body's response to injury and involves a cascade of events leading to blood clotting. While it is a regulated process, it is not typically described as being under homeostatic control.

d) Blood pH level: This is a classic example of a process under homeostatic control. The body maintains blood pH within a narrow range (around 7.35-7.45) through various mechanisms, including the respiratory and renal systems, to ensure proper cellular function.

e) I am finished!: This option is not relevant to the question as it does not describe a physiological process.

In summary, blood pH level is a process that is under homeostatic control, as the body actively regulates it to maintain a stable internal environment.