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Neural Control and Coordi question bank (Biology)

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Q1.

Events occurring during signal propagation in a chemical synapse are given below.
P: Postsynaptic membrane potential changes.
Q: Synaptic vesicle fuses with the presynaptic membrane.
R: Action potential depolarizes the presynaptic terminal.
S: Neurotransmitter binds to receptors on the postsynaptic membrane.
T: Neurotransmitter is released into the synaptic cleft.
The correct sequence of occurrence of these events is:

(A)

R, Q, T, S, P

(B)

Q, R, P, S, T

(C)

R, T, Q, P, S

(D)

Q, R, T, S, P

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Q2.

Graphical representation of action potential across the membrane of a neuron is shown below. The different stages of the action potential are shown with numbers 1 to 5 . Choose the correct statement about the $\mathrm{Na}^{+}$and $\mathrm{K}^{+}$ion concentration across the membrane in stage 4 .

(A)

Opening of $\mathrm{K}^{+}$ion channels, leading to $\mathrm{K}^{+}$efflux.

(B)

Equilibrium is reached between $\mathrm{Na}^{+}$and $\mathrm{K}^{+}$across the membrane.

(C)

Both $\mathrm{K}^{+}$and $\mathrm{Na}^{+}$ion channels are open leading to more $\mathrm{K}^{+}$influx than that of $\mathrm{Na}^{+}$.

(D)

Opening of $\mathrm{Na}^{+}$ion channels, leading to $\mathrm{Na}^{+}$efflux.

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