ANSWER

Chapter 2: Body CoordinationAnswerExercise 1

1. body coordination

2. (a) Nervous system (b) Endocrine system

3. (a) constant (b) detect (c) function

4.

Exercise 21.

Sensory neurone

motor neurone.

2. (a) (i) sensory (ii) sensory organs (iii) detect stimulus

(b) (i) muscle (ii) glands

(c) central nervous system

3. (a) A rapid and automatic reaction.

(b) (i) Knee jerk (ii) Withdrawal of hand from a hot object.

(c) For protection in critical situations.

(d)

StimulusHeat

Receptor Pain receptors in the finger

Part of the central nervous system involved Spinal cord

EffectorMuscles in the arm

Response Withdrawal of hand from the hot object

(e) (i) Heat, pain receptors

(ii) sensory, spinal cord

(iii) relay , motor

(iv) motor, muscles

(v) muscles , contract and relax

(vi) withdrawn from the hot object.

Nervous System

Central nervous system

peripheral nervous system s

brain

Spinal cord

Cranial nerves

Spinal nerves

The control centre of the nervous system

Nerves from the brain

Nerves from the spinal cord

Link receptor and effector with the central nervous system

Response

Central nervous system

Effector

Stimulus

Receptor