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masalah 1
pilihan
What happens during depolarization in an axon?
- Na+ ions leave the axon
- K+ ions enter the axon
- Na+ ions enter the axon
- K+ ions leave the axon
Labirin
Gaya Bebas
Universiti
sains
Nervous system
MASPAITILLA MA
56
0
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masalah 2
pilihan
How is a nerve impulse transmitted across a synapse?
- Mechanically
- Electrically
- Chemically
- Optically
masalah 3
pilihan
What is the role of the sodium-potassium pump in maintaining resting potential?
- Pumps 3 Na+ out and 2 K+ in
- Pumps 2 Na+ out and 3 K+ in
- Pumps 3 K+ out and 2 Na+ in
- Pumps 2 K+ out and 3 Na+ in
masalah 4
pilihan
What happens during the depolarization phase of an action potential?
- K+ channels open
- Na+ channels close
- Na+ channels open
- Action potential peaks
masalah 5
pilihan
Which component of a neuron is responsible for conducting impulses away from the cell body?
- Dendrites
- Axon
- Cell body
- Synaptic knob
masalah 6
pilihan
What is the primary function of the synaptic vesicles in a neuron?
- Store calcium ions
- Store neurotransmitter molecules
- Transmit electrical signals
- Protect the neuron
masalah 7
pilihan
What is the role of the myelin sheath in nerve impulse conduction?
- To slow down nerve impulse transmission
- To prevent ion exchange across the axon membrane
- To act as an electrical insulator and speed up transmission
- To store neurotransmitters
masalah 8
pilihan
What is the function of neurotransmitters in a synapse?
- To generate electrical impulses
- To transmit chemical signals across the synaptic cleft
- To break down acetylcholine
- To bind to intracellular receptors
masalah 9
pilihan
How does cocaine affect dopamine synapses in the brain?
- It increases dopamine reabsorption
- It blocks dopamine receptors
- It prevents the release of dopamine
- It blocks reabsorption of dopamine, increasing its levels in the synapse
masalah 10
pilihan
What characterizes the refractory period in neurons?
- The period when the neuron is hyperactive
- The period when the neuron is more sensitive to stimuli
- The period when the neuron is insensitive to new stimuli
- The period when the neuron is depolarizing
masalah 11
pilihan
Which part of the nervous system is responsible for 'fight or flight' responses?
- Somatic Nervous System
- Parasympathetic Nervous System
- Sympathetic Nervous System
- Central Nervous System
masalah 12
pilihan
What is the resting potential of a neuron?
- The membrane potential when a neuron is not transmitting an impulse
- The membrane potential when a neuron is transmitting an impulse
- The potential energy stored in a neuron
- The electrical charge of a neuron at peak action potential
masalah 13
pilihan
During which phase of the action potential do voltage-gated sodium channels open?
- Resting state
- Depolarization
- Repolarization
- Hyperpolarization
masalah 14
pilihan
What role does calcium play at the synapse?
- It depolarizes the postsynaptic membrane
- It triggers the release of neurotransmitters
- It inhibits the action potential
- It acts as a secondary messenger
masalah 15
pilihan
During resting potential, what is the state inside the axon?
- More positive
- More negative
- Neutral
- Equal to outside
masalah 16
pilihan
What triggers the opening of voltage-gated sodium channels during depolarization?
- Low potassium levels
- High calcium influx
- Presence of a stimulus
- Release of neurotransmitters
masalah 17
pilihan
In which phase of action potential do voltage-gated potassium channels open?
- Resting phase
- Depolarization
- Rising phase
- Falling phase
masalah 18
pilihan
What is the primary role of the sodium-potassium pump in neurons?
- To depolarize the neuron
- To maintain resting potential by pumping sodium out and potassium in
- To facilitate neurotransmitter release
- To conduct action potentials
masalah 19
pilihan
What structure is responsible for releasing neurotransmitters into the synaptic cleft?
- Axon terminal
- Dendrite
- Node of Ranvier
- Myelin sheath
masalah 20
pilihan
What is the difference in charge across the axon membrane during resting potential?
- Positive inside, negative outside
- Negative inside, positive outside
- Neutral inside and outside
- Positive inside and outside
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