Homeostasis, and Negative/Positive Feedback Processes

Question 1

Define homeostasis and explain what is meant by “internal environment” vs. “external environment”

Answer 1

homeostasis is the stability of the internal environment
- “internal environment” is inside the body
- “external” is what’s outside the body (past the epidermis/our barrier)

Question 2

What are the three main body fluid compartments?

Answer 2

• Intracellular Fluid
• Plasma (extracellular)
• Interstitial Fluid (extracellular)

Question 3

Free exchange of water and small soluble molecules occurs between which two compartments?

Answer 3

The plasma and interstitial compartment

Question 4

Define receptors (sensors)

Answer 4

Monitors –> responds to stimuli

Question 5

Define integrating centers

Answer 5

“control center” –> analyzes info that was detected by the sensor; determines what correct action to take

Question 6

Define set points

Answer 6

normal physiological parameters

Question 7

Define effectors

Answer 7

(cell, tissue, gland, or organ) generate a response

Question 8

What are the roles from those terms earlier in maintaining homeostasis?

Question 9

Explain how deviations from a set-point can trigger compensatory changes within the body.

Answer 9

the control center was analyze the problem or info to stimulate the effector to do it’s job, which is to compensate from the deviations.

Question 10

Explain what negative feedback is and describe how it can regulate the actions of the effector.

Answer 10

It is a loop that responds to the stimuli, in which it becomes analyzed to tell the effector how much compensation it is needed to maintain homeostasis (stability of the internal environment within the normal physiological parameters)

Question 11

diagram thermoregulation to maintain body temp. account for the mechanisms that cool us down when we are too hot and those that heat us up when we are too cold

Question 12

*diagram the regulation of blood glucose. account for the mechanisms that increase blood glucose levels when it is too low and that decrease blood glucose levels when it is too high.

Question 13

Define positive feedback loop and provide two detailed physiological examples of a positive feedback loop that can occur in the human body

Answer 13

has an “end” product in a process that stimulates the process. Does not restore homeostasis. and is a temporary process –> until the desire of result has been accomplished