Nervous System tracker

Question 1

Why is this a simple reflex arc?

Answer 1

There’s only 3 neurones involved

Question 2

advantages of simple reflexes

Answer 2

1. Rapid
2. Used for protection
3. Don’t have to learn them
4. They’re automatic

Question 3

Explain how synapses ensure impulses only travel in one direction.

Answer 3

1. There’s only synaptic vesicles in the presynaptic neurone
2. There’s only receptors on the post synaptic neurone.

Question 4

Labels?

Answer 4

A. vesicle
B. neurotransmitter
C. synaptic cleft

Question 5

The following statements are about events during an action potential

A. Potassium ions diffuse out across the neurone membrane.
B. Sodium ions diffuse in across the neurone membrane
C. Sodium ion channeis open.
D. Active transport of sodium and potassium ions restores resting potential.
E. Potassiurn ion channels open.
F. Hyperpolarisation of the membrane occurs.

1. Which of the events starts depolarisation?

Answer 5

D