5.1.5 Plant And Animal Response

Question 1

State the difference between the periphel and the CNS

Answer 1

The CNS is the brain and the spinal cord, the PNS is all other neurones

Question 2

State and explain why many autonomic functions can also be controlled by the somatic nervous system

Answer 2

Breathing can be controlled, person can hold their breath underwater, not possible to breathe normally in this enviornment

Question 3

State the difference between the function of the anterior pituitary and postieror pituitary

Answer 3

Anterior pituitary produces hormones, posterior pituitary stores and secretes hormones produced by the hypothalamus

Question 4

Suggest and explain which part of the brain may be damaged if a pateint displays a lack of motor movement

Answer 4

Cerebellum

Responsible for muscualr movement, body posture and balance

Question 5

State the reflex arc which occurs when doctors test the knee jerk reflex

Answer 5

(Pressure) receptor -> sensory neurone -> relay neurone -> motor neurone -> extensor muscle

Question 6

State and explain how a reflex action can imorove an organisms chance of survival

Answer 6

An involuntary resposne that does not include the brain in the reflex arc, decreases reaction time

Question 7

Describe the similarties and difference in the structure and fucnfion of cardiac and involountary muscle

Answer 7

Similarities: both involountary/unconsciuos control, both uninucleated
Difference: cardiac- fibres branched
Involuntary: slower to contract