Nervous System

Question 1

Understand that the nervous system _______

Answer 1

enables humans to react to their surroundings and coordinate their behaviour

Question 2

Explain how the structure of the nervous system is adapted to its functions:

Answer 2

• Information from receptors passes along cells (neurones) as electrical impulses to the central nervous system (CNS).
• The CNS is the brain and spinal cord.
• The CNS coordinates the response of effectors which may be muscles contracting or glands secreting hormones.

Question 3

SRCER

Answer 3

Stimulus - Receptor - Coordinator - Effector - Response

Question 4

Explain how structures in a reflex arc relate to their function:
SRM

Answer 4

• Sensory neuron sends electrical impulses to a relay neuron, which is located in the spinal cord of the CNS
• Relay neurons connect sensory neurons to motor neurons.
• Motor neuron sends electrical impulses to an effector.

Question 5

Understand why reflex actions are important:

Answer 5

• Automatic ( they do not involve the conscious part of the brain)
• Rapid; protect from harm

Question 6

SRSRMER

Answer 6

STIMULUS
RECEPTOR
SENSORY NEURONE
RELAY NEURONE
MOTOR NEURONE
EFFECTOR
RESPONSE