2.13 and 2.14 Structure and function of the nervous system and reflex arc

Question 1

What do receptor cells convert?

Answer 1

.A stimulus into an electrical impulse

Question 2

What type of cell does an electrical impulse travel along?

Answer 2

Sensory neurons to CNS

Question 3

What occurs in the CNS?

Answer 3

Information is processed and an appropriate response is coordinated

Question 4

An electrical impulse is sent along what to effectors?

Answer 4

Motor neurones

Question 5

What do effectors do?

Answer 5

Carry out the response

Question 6

What are Automatic responses known as?

Answer 6

Reflexes

Question 7

What is the pathway that information travels down known as?

Answer 7

Reflex arc

Question 8

Give two examples of reflex arcs

Answer 8

.Pupils getting smaller to avoid damage from bright lights

.Moving your hand off a hot surface to prevent damage

Question 9

Give the pathway for the reflex arc

Answer 9

1. A stimulus is detected by receptors
2. Impulses are sent a long a sensory neurone
3. In the CNS the impulse passes to a relay neurone
4. Impulses are sent a long a motor neurone
5. The impulse reaches an effector resulting in an appropriate response

Question 10

What are synapses?

Answer 10

The gaps between two neurones

Question 11

What chemical is released into the synapse?

Answer 11

Neurotransmitter

Question 12

How does the neurotransmitter get across a synapse?

Answer 12

It diffuses

Question 13

What are some nerves surrounded by?

Answer 13

A myelin sheath

Question 14

What is the advantage of having nerves surrounded by Myelin?

Answer 14

Nerve transmission can travel faster

Question 15

What cells produce Myelin?

Answer 15

Schwann cells