Nervous System 1

Question 1

what is Homeostasis?

Answer 1

The ability of the body to maintain a constant environment.

Question 2

4 components of homeostasis mechanism?

Answer 2

Receptors - detect changes in the body
Communicating Pathways - allow receptors to pass on messages from the control center to receptor
Control Centre- analyses change and decide a response
Effectors- tissues or organs that produce a response ( reverse initial change)

Question 3

what is negative feedback and importance

Answer 3

counteracts change to maintain homeostatic environment e.g. fall in blood pressure - baroreceptors detect- axons send message to control centre - increase in heart activity - rise in blood pressure

Question 4

what is positive feedback

Answer 4

more rare occasions e.g. childbirth, baby’s head on cervix - stretch receptors - control centre - oxytocin - uterus muscle contracts,