What would happen to an Action Potential if voltage-gated
K+ channels were blocked?
A.
the Action Potential could not occur
B.
the Action Potential would not repolarize
C.
the height of the action potential would be reduced
D.
the undershoot (after-hyperpolarization) would not occur
The voltage-gated Na+ channels are ---------;
Single-gated
Double-gated
Open upon Acetylcholine binding
Allow fast influx of Na+ ions
All of the above
Only #2 and #4
Only #2, #3 and #4
Define an action potential. How are the Na+, K+, and Ca+ ions
involved in an action potential? How does the myelin speed up its
transmission?
Define a neurotransmitter. Where are they stored and how do
they relay an action potential message from one cell to the
next?
Define threshold. How do neurotransmitters bring target cells
toward or away from threshold. What happens to the response of the
target cell if threshold is not reached? What happens if threshold
is reached?...
An action potential is
a. a reversal of the Na+ and K+ concentrations inside and outside
the neuron.
b. the same size and shape at the beginning and the end of the
axon.
c. initiated by inhibitory post synaptic graded potentials.
d. transmitted to the distal end of a neuron and cause release of
neurotransmitter.
e. Both b and d are correct
2. Axonal transport refers to:
a. the release of neurotransmitter molecules into the synaptic
cleft.
b. the use...
1. What would happen if there were a blockage to voltage-gated
Na+ channels during an action potential?
2. What would occur to an action potential if there was delayed
inactivation of voltage-gated Na+ channels?
3. What would happen to an action potential when a toxin
prevents ACh binding to nAChRs on muscle fibres?
4. What would happen to an action potential if a toxin which
forms pores in the cell membrane of neurons, allowing the influx of
Ca2+ into the...
QUESTION 1
What letter corresponds to the phase in which voltage-gated Na+
channels are open?
action potential.pdf
A.
B.
C.
D.
E.
QUESTION 2
Which of the following statements is true about the mRNA whose
structure is depicted in the diagram shown below? mRNA
schematic.pdf
A.This could be a primary transcript from a prokaryote.
B. This could be a primary transcript from a eukaryote but not a
prokaryote.
C. This could be a mature mRNA from a eukaryote but not...
1. During an Action potential, Na+ enters the cell and causes
the membrane voltage to become less negative. This process is
called______________.
2. During Resting Membrane Potential of a cell, Na+ is more
concentrated __________ whereas K+ is more concentrated
____________.
3. At the beginning of Repolarization, ______ channels close and
______ channels open.
4. What is the name of the muscle fiber organelle that is
continuous with the sarcolemma and transmits an action potential
through the inside of a...