Question

fig. 3. homeostasis and the environment
fig. 4. positive and negative feedback
questions

1. what is homeostasis?
2. homeostatic mechanisms/regulation involves three (3) parts, list them below:

a.
b.
c.

1. define set - point -
2. what is the difference between positive and negative feedback mechanisms?
3. which type of feedback mechanism is most common in the body?
4. list one example of a negative feedback mechanism and how it functions:

Explanation:

1. Homeostasis is the ability of the body or a system to maintain a stable internal environment despite external changes.
2. The three parts of homeostatic mechanisms/regulation are a receptor (detects changes), a control center (processes information and determines response), and an effector (carries out the response).
3. A set - point is the normal or target value for a particular variable (e.g., body temperature) that the homeostatic system attempts to maintain.
4. Negative feedback mechanisms work to counteract changes and return a variable to its set - point. Positive feedback mechanisms amplify changes and move a variable further from its set - point.
5. Negative feedback mechanisms are most common in the body as they help maintain stability.
6. An example of a negative feedback mechanism is the regulation of blood glucose levels. When blood glucose rises, the pancreas secretes insulin, which promotes the uptake of glucose by cells, reducing blood glucose levels back to normal.

Answer:

1. The ability to maintain a stable internal environment.
2. a. Receptor

b. Control center
c. Effector

1. The normal or target value for a variable.
2. Negative feedback counteracts changes; positive feedback amplifies changes.
3. Negative feedback.
4. Blood glucose regulation: When blood glucose rises, insulin is secreted to lower it.