Nervous System: Action Potential

Riki M
Quiz by Riki M, updated more than 1 year ago
Riki M
Created by Riki M about 6 years ago
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Description

Bachelors Degree Biology Quiz on Nervous System: Action Potential , created by Riki M on 09/11/2015.

Resource summary

Question 1

Question
Resting Membrane Potential is the difference across plasma membranes expressed in millivolts
Answer
  • True
  • False

Question 2

Question
Resting Membrane Potential is determined by..
Answer
  • Permeability to Na+ and K+
  • Permeability to Na+ and Ca+
  • Permeability to K+ and Ca+

Question 3

Question
When k+ concentration inside the cell is high, the electrical gradient will force K+ into the cell because the electrical gradient is stronger than the chemical gradient.
Answer
  • True
  • False

Question 4

Question
When Na+ concentration inside the cell is low, the cell will
Answer
  • Move Na+ into the cell because of the chemical gradient
  • Move Na+ out of the cell because of the electrical gradient
  • Move Na+ into the cell because of the electrical gradient
  • Move Na+ out of the cell to reach an equilibrium

Question 5

Question
Resting membrane potential is -70mV
Answer
  • True
  • False

Question 6

Question
An Action Potential occurs when a threshold point of -40mV is reached
Answer
  • True
  • False

Question 7

Question
When an action potential begins, [blank_start]depolarisation[blank_end] occurs, causing [blank_start]Na+[blank_end] voltage gates to open and allow Na+ to flow [blank_start]into[blank_end] the cell.
Answer
  • depolarisation
  • Repolarisation
  • Na+
  • K+
  • into
  • out

Question 8

Question
During the repolarisation phase of an action potential..
Answer
  • Na+ voltage gates close at -30mV (ICF)
  • Na+ voltage gates open
  • K+ gates opening, allowing K+ to flow out the cell
  • K+ gates close at -90mV (ICF)
  • K+ gates open at -90mV(ICF)

Question 9

Question
The electrical signal (action potential) is sent along the axon of a nerve cell
Answer
  • True
  • False

Question 10

Question
What happens to the electrical signal (action potential) when it enters the axon terminal?
Answer
  • It enters the synaptic cleft as neurotransmitters
  • it stays in the axon terminal
  • It changes to a chemical signal
  • Causes an influx of Ca+
  • It continues as an electrical gradient
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