Question

7.Which of the following can prompt an electrically gated ion channel in the cell membrane to open?

a)one additional ion entering the cell b)one ion leaving the cell c)activity of the sodium-potassium pump d)a change in the electrical potential of the membrane

10. If you have ever awoken from sleep to scribble down a brilliant idea, you can probably relate to Loewi, whose own sleep was interrupted with notes with an insight about ______.

a) action potential speed b) chemical transmission at the synapse. c) function of the sodium-potassium pump. d) synaptic structure

11.In at least (4) four sentences, describe two properties of the nervous system that disprove Dale’s principle.

Answer 1

Question 7

The change in the electrical potential of the cell causes an electrically gated ion channel in the cell membrane to open. Hence, option d is correct.

Question 10

Loewi own sleep was interupted with the notes with an insight about chemical transmission at the synapse. Hence, option b is correct.

Question 11

The two properties of the nervous system that disprove Dale's principle are:

I. The given neuron releases only one neurotransmitter. Also, the same functional effect of neurotransmitter generate the same effect.

II. It is very unlikely that single neuron could store and release same neurotransmitter at all the junctions.