Nervous system (To improve)

Question 1

Neurones

Answer 1

• Transmit electrochemical signals called nerve impulses
• There are 3 types of neurones:
  1. Sensory neurones
  2. Relay neurones
  3. Motor neurones

Question 2

Synapse

Answer 2

The gap between neurones

Question 3

Sensory neurones

Answer 3

• Carry impulses from sense organs or receptors to the central nervous system

Question 4

Relay neurones

Answer 4

• Provide connections between sensory and motor neurones and between themselves

Question 5

Motor neurones

Answer 5

• Stimulate effectors
• Carry impulses from brain or spinal cord to effectors

Question 6

Voluntary vs Reflex action

Question 7

Reflex action

Answer 7

It is an immediate response to a specific stimulus without conscious control

Question 8

Reflex arc

Answer 8

It is a pathway by which impulses travel from receptor to effector

Question 9

Process of a reflex action

Answer 9

1. A receptor detects the stimulus
2. Nerve impulse is generated and travels along the sensory neurone to the spinal cord
3. In the spinal cord, nerve impulses are transmitted across a synapse to the relay neurone and then across another synapse to the motor neurone
4. Nerve impulse travel along the motor neurone to the effector
5. Effector muscle contracts