Unit 3

Question 1

What does the CNS consist of?

Answer 1

Brain and spinal cord

Question 2

What does the spinal cord do?

Answer 2

transmits sensory information along sensory neurons from the PNS to the brain

transmits information from the brain to the PNS, activating motor neurons

Question 3

What does the PNS do?

Answer 3

Links the CNS to other parts of the body

Question 4

What are the divisions of the PNS?

Answer 4

Somatic NS, Autonomic NS

Question 5

What does the Somatic NS do?

Answer 5

Transports messages between sense organs and the spinal cord

Controls voluntary bodily movement via connections with the skeletal muscles

• Involves sensory (afferent) and motor (efferent neurons) SAME

Question 6

What is the process of the spinal reflex?

Answer 6

Pain receptors are stimulated
triggering sensory neurons to communicate with the spinal cord

Passes through interneuron in SC to motor neuron
to flex muscles to remove from object

Message also goes to the brain to register painful sensation

Question 7

What does the Autonomic NS do?

Answer 7

Controls involuntary bodily activities (digestion, heart rate)

Question 8

What is the Autonomic NS divided into?

Answer 8

Symphatetic NS, Parasympathetic NS

Question 9

What does the Sympathetic NS do?

Answer 9

initiates some responses and inhibits others to mobilise or immobilise the body as part of the fight-flight-freeze when threatened

Question 10

What does the parasympathetic NS do?

Answer 10

conserves bodily functions by restoring the body to homeostasis