Homeostasis

Question 1

What is the definition of homeostasis?

Answer 1

The provision of an internal environment that is optimal for cell function at any moment of time.

Question 2

Why is the homeostatic range?

Answer 2

Concentration of chemicals within the body → blood glucose (monitoring diabetic women is important)
Function of an organ
Number of a particular cell type

Question 3

What is the normal body temperature?

Answer 3

Body temperature has a narrow range 36.2-37.7 C

Question 4

What factors influence body temperature?

Answer 4

--> can fluctuate depending on BMI
→ level of activity
→ sleep and while awake: high temp at night can be a sign of TB
→ stages of life
→ Blood pressure

Question 5

What are the variations during the time of illness?

Answer 5

Increase in WBC count
Temperature will rise
Heart Rate
Homeostatic adaptation

Question 6

What is the feedback mechanism?

Answer 6

Detect disturbance to homeostasis
Assess the magnitude of the disturbance
Promote an appropriate response to redress homeostasis

Question 7

What are the components of the homeostasis?

Answer 7

Receptors
Homeostatic control centres e.g: the hypothalamus, the pancreas and body cells
Effectors

Question 8

Where is temperature regulated?

Answer 8

Temperature regulation centres in the hypothalamus alter the activities of effector organs that may be some distance from the centres.
Cells have control centres within the nucleus and organelles at as the effectors providing local regulations

Question 9

What do control centres involve?

Answer 9

When blood acidity exceeds its homeostatic range (acidosis-hydrogen ions).
Buffers- neutralise acidity
Respiration-rate and depth of breathing increases
Urinary mechanism-kidneys produce more acidic urine.