Term 2 Chapter 4 Lesson 3

Question 1

2 Types of Neurotransmitters

Answer 1

Exhibitory

Inhibitory

Question 2

Resting Potential

Answer 2

-70 mv (No stimulus)

Question 3

What is a Reflex Arc

Answer 3

A nerve pathway that consists of the sensory neurons, interneurons, and motor neurons.

Question 4

What is a nerve impulse?

Answer 4

A nerve impulse is an electric charge travelling the length of the neuron.
Nerve impulse = Action potential

Question 5

What is a neurotransmitter?

Answer 5

The chemical that diffuses across the synapse and it causes channels to open on the neighboring cell and create a new action potential.

Question 6

What is a synapse?

Answer 6

The small gap between the axon and the dendrite of another neuron. A synapse is where vesicles release chemicals through exocytosis.

Question 7

What is a threshold?

Answer 7

The threshold is a minimum stimulus when a cell is depolarized and reached -55mv, at this point, the action potential occurs.

Question 8

What is the role of acetylcholine?

Answer 8

The transfer of acetylcholine simulates the muscles to move.

Question 9

Explain the action potential

Answer 9

When a neuron reaches its threshold, action potential occurs - sodium channels open and the sodium channels close; later, potassium channels open and potassium goes out of the neuron and the neuron reaches the resting potential (-70 mv)

Question 10

How might the reflex arc be completed before the brain interprets the event?

Answer 10

Even before the information reaches the brain, a single zaps back out from the spinal cord that tells the effectors, which are the muscles to move.