nervous system 2 physiology

Nervous System 2: Neurophysiology

Outcomes

1.      Explain what are membrane ion channels and briefly outline how they function

2.      Differentiate between gated and non-gated (leakage) ion channels

3.      Differentiate between chemically gated, voltage gated and mechanically gated ion channels

4.      Explain how the resting membrane potential is generated

5.      Outline how membrane potentials can function as ‘signals’

6.      Describe a graded potential

7.      Describe an action potential included the changes that take place in each of the stages depolarisation, repolarisation and hyperpolarisation

8.      Describe what is a synapse and distinguish between electrical and chemical synapses

9.     

?

1. in regards to membrane potentials as signals which is false

  • two changes can take place depolarisation and hyperpolarisation
  • two types of signals can be created graded and action potentials
  • change in membrane potential results in changes in membrane permability by the opening of non gated ion channels
  • neurons use changes in membrane potentials as communication signals
  • membrane potential can change due to abnormal concentrations of ions
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Other questions in this quiz

2. depolarisation and repolarisation which is true

  • the resting membrane potential of an average neuron is 60mv
  • depolarisation increases the probability of a nerve impulse
  • hyperpolarisation and depolarisation do not change the resting membrane potential
  • the inside of the cell becomes more positive during hyperpolarisation
  • depolarisation is an increase in membrane potential

3. two types of signals result of changes in resting membrane potential graded and ungraded potentials

  • False
  • True

4. in regards to graded potentials which is true

  • receptor potential a type of graded potential resulting from a neuro transmitter
  • size of graded potential not attributed to stimuli
  • stimulus is caused by leaky channels becoming more permable
  • stimulation to the plasma membrane causes the inside of the cell to become less negative
  • long lived

5. which is false in regards to graded potentials

  • in graded potentials the cytosol becomes less negative and the extracellular fluid becomes less positive
  • stimulant to the plasma membrane will result in positive ions moving towards negative ions
  • the current caused by the graded potential is lost as it travels across the plasma membrane due to gated channels
  • divided into postsynaptic potential and receptor potential
  • fluids inside and outside the cell are good conductors
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Comments

Mel Dyer

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Q10 0 should this not be Na stopped by the inactivation gates if you want it to be true?

Mel x

Mel Dyer

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Q10 0 should this not be Na stopped by the inactivation gates if you want it to be true?

Mel x

Mel Dyer

Report

Q10 0 should this not be Na stopped by the inactivation gates if you want it to be true?

Mel x

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