Kahoot Neurophisiology 1

Question 1

At membrane resting potential: which ion is in equilibrium and which ion in tension?

Answer 1

Na+ in tension and K+ in equilibrium

Question 2

Which ion can move relatively freely across the membrane because of non-gated ion channels?

Answer 2

K+

Question 3

In a typical neuron, which ion has a larger concentration inside than outside the cell?

Answer 3

K+

Question 4

What force(s) act upon Na+ such that it flows across the membrane when a Na+ channel opens? (eteronormativi comunisti!)

Answer 4

Electrostatic + diffusion

Question 5

Which direction does Na+ flow when at resting potential a voltage-gated Na+ channel opens?

Answer 5

In

Question 6

What is a depolarization of a neuron at rest?

Answer 6

Becomes less negative inside :)

Question 7

Which electrical signal of neurons is ‘all-or-nothing’?

Answer 7

The Action Potentiallll

Question 8

A neuron has an input side and an output side, electrically. What are they, normally?

Answer 8

Input: dendrite
Output: axon terminal

Question 9

What is the most important mechanism underlying the absolute refractory phase?

Answer 9

Na+ vg channels inactivation after activity

Question 10

What is the end function of myelin?

Answer 10

Increase of action potential speed

Question 11

How does myelin speed up action potential (AP) propagation? (usa il professorese)

Answer 11

increases distance of electrotonic conduction in axon