Homeostasis Lecture 2

Question 2

Homeostasis

Answer 2

Equilibrium state where the body’s internal environment is balanced. Being microscopically balanced to be in a macro state.

Question 3

Feedback Mechanisum

Answer 3

1. Stimuli
2. Receptors detect change
3. Input
4. Control Center
5. Output
6. Response

Question 4

Autoregulation Intrinsically

Answer 4

when internal structures adjust
Intercellular and intracellular
Between cells and in cells

Question 5

Extrinsic regulation

Answer 5

controlled via the nervous and endocrine

Question 6

Negative Feedback and Example

Answer 6

Commonly used throughout body
Reduces the orignal stimuli or change and shuts it off. Example) Blood Glucose levels Alpha and Beta Cells
1. Stimuli low blood glucose
2. Pancrease alpha cells create glucagon
3. Liver breaks glycogen into glucose
4. Glucose is released
Stimuli high glucose –> beta cells insulin –> increases cell permutability to glucose, and liver stores as glycogen and fats

Question 7

Positive Feedback

Answer 7

Not common
Amplifies the original stimuli , moves away from homeostasis. Example: Oxytocin and contractions
1. Hypo. release oxytocin
2. Muscles contract
3. head against cervix nerves triggers action potential
4. Nerves tell more contractions!

Question 8

Disturbances in Homeostasis

Answer 8

Increase risk of disease
Contributes to aging
control systems become less effective