Physiological Homeostasis (week 1)

Question 1

Define homeostasis

Answer 1

An evolutionary development of metabolic wisdom that provides for internal constancy. Homeostasis is not steady state but a dynamic equilibrium

Question 2

Give examples of responses to physiological stimuli
In honeostastis

Answer 2

Increased heart rate during exercise
Fever when unwell
Increased urination after drinking

Question 3

Give examples of situational homeostasis

Answer 3

Eating when hungry
Wearing a hat in the sunshine
Holding your breath while swimming

Question 4

List some factors under homeostasis control

Answer 4

Nutrients
Gases
Waste products
pH
Salt and other electrolytes
Temperature
Volume and pressure

Question 5

Describe negative feedback loop

Answer 5

When the product of a reaction leads to a decrease in that reaction

Question 6

Give an example of a negative feed back loop

Answer 6

Sensor (skin hypothalamus) —> comparator (hypothalamus) —> effector (sweat glands leads to sweating) —-> variable (heat loss)

Question 7

Define positive feedback loop

Answer 7

When the product of a reaction leads to an increase in that reaction

Question 8

Give an example of positive feedback loop,

Answer 8

Come back later

Question 9

Describe principles of and the components of the physiological feedback loop

Answer 9

Stimulus
Receptor
Control centre
Effector
response

Question 10

What is feedforward, and give an example

Answer 10

Is an anticipatory change in physiological variable.

Salivation in anticipation of eating

Question 11

What does persistent deviations from homeostasis mean

Answer 11

Diseaseeeee