Synapse & Action Potentials

Question 1

An excitatory post-synaptic potential (EPSP) is not the same as action potentials.

Answer 1

False

Question 2

Electrical synapses do not involve neurotransmitters just like chemical synapses.

Answer 2

False

Question 3

Excitation is caused by opening of the voltage-gated sodium channels.

Answer 3

True

Question 4

Excitation of motor and sensory neurons involved in reflexes use the small molecule system of transmitters.

Answer 4

True

Question 5

For excitation to take effect, either the chloride channels or the potassium channels open.

Answer 5

False

Question 6

If ever potassium channels open, potassium enters the cell.

Answer 6

False

Question 7

If ever the chloride channels open, chloride ions enter the membrane.

Answer 7

True

Question 8

Ligand-gated sodium channels are only present in

presynaptic membranes.

Answer 8

False

Question 9

Most of the neural synapses are chemical in nature that use neurotransmitters.

Answer 9

True

Question 10

The receptors where the neurotransmitters attach

are closely associated with the ion channel.

Answer 10

True

Question 11

Voltage-gated sodium channels should open and allow

calcium to enter prior to exocytosis of neurotransmitters.

Answer 11

False

Question 12

The gamma amino butyric acid acts as an inhibitory neurotransmitter AND Dopamine also acts as an inhibitor transmitter at the synaptic junction.

• First statement is true, and the second statement is false.
• First statement is false, and the second statement is true.
• Both statement is true.
• Both statement is false

Answer 12

Both statement is true.

Question 13

Temporal summation is a successive discharge from multiple presynaptic terminal AND is a result of rapid discharges that add up to one another.

• First statement is true, and the second statement is false.
• First statement is false, and the second statement is true.
• Both statement is true.
• Both statement is false

Answer 13

First statement is false, and the second statement is true.

Question 14

Excitation of a single pre-synaptic terminal on the surface of the neuron almost never excites a neuron AND the reason is the amount of transmitter released by a single terminal is not greater than the 10 to 20 millivolts.

• First statement is true, and the second statement is false.
• First statement is false, and the second statement is true.
• Both statement is true.
• Both statement is false

Answer 14

First statement is true, and the second statement is false.

Question 15

Glycine can inhibit the neuron form generating impulses While Glutamate excites the neuron.

• First statement is true, and the second statement is false.
• First statement is false, and the second statement is true.
• Both statement is true.
• Both statement is false

Answer 15

Both statement is true.

Question 16

Opening of the chloride ions increases the negativity of the cell membrane AND the activation of the receptor enzymes decreases the number of excitatory receptors cause the cell to be inhibited.

• First statement is true, and the second statement is false.
• First statement is false, and the second statement is true.
• Both statement is true.
• Both statement is false

Answer 16

Both statement is true.