I have a few multiple choice questions from my coursework:

multiple choice please answer ALL below:

a. the transmission of nerve impulses along length of a neuron is due to the movement of:
1. neurotransmitters across the cell membrane
2. Na+ & K+ ions along the cell membrane
3. neurotransmitters through the membrane of the cell
4. Na+ & K+ ions through the membrane of the cell

b. which of the below options changes to an action potential shows a larger stimulus?
1. increase in wavelength
2. increase in frequency
3. increase in speed
4. increase in amplitude

c. what membrane voltage do neuronal voltage gated Na+ channels gain activation/become activated?
1. -50mV
2. -0mV
3. -70mV
4. +50mV
5. none of them

Hyperpolarization phase of the action potential is because of:

1. the opening of voltage-gated Ca2+ channels

2. prolonged opening of voltage-gated K+ channels

3. closure of resting Na+ channels

4. closing of Ca2+ channels

5. None of these options

What does the diagram attatched not represent?

1. the effectors in the diagram are muscle cells

2. cell B is an interneuron in the brain

3. cell c is a motor neuron

4. cell a becomes activated when the receptor gets a signal from it’s enviornment