Helpin biology please?

Question

<1. Creation and transmission of a nerve impulse depends primarily on the stimulus

A. increasing the neuron's permeability to sodium ions and thus allowing these ions to enter the neuron.

B. decreasing the neuron's permeability to sodium ions and thus allowing these ions to leave the neuron.

C. increasing the neuron's permeability to potassium ions and thus allowing these ions to enter the neuron.

D. decreasing the neuron's permeability to potassium ions and thus allowing these ions to leave the neuron.

2. A neuron will transmit an impulse when the strength of a stimulus is great enough to reach the

A. polarization level.

B. threshold level.

C. synapse.

D. axon.

3. Which of the following descriptions is NOT characteristic of action potentials?

A. They are produced by voltage-regulated gates .

B. They are conducted without a decrease in intensity.

C. They are produced when Na+ and K+ gates open at the same time

Answer 1

1. A

2. B

3. C, Na gates open before the K gates