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Zombie vs Penyelidik
Main Pasukan
Universiti
Sains
Nervous system(copy)
MASPAITILLA MA
26
Masalah tambahan (20/ 20)
Allow incorrect answer
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public kuiz

# 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

# 2

pilihan

How is a nerve impulse transmitted across a synapse?

  • Mechanically
  • Electrically
  • Chemically
  • Optically

# 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

# 4

pilihan

What happens during the depolarization phase of an action potential?

  • K+ channels open
  • Na+ channels close
  • Na+ channels open
  • Action potential peaks

# 5

pilihan

Which component of a neuron is responsible for conducting impulses away from the cell body?

  • Dendrites
  • Axon
  • Cell body
  • Synaptic knob

# 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

# 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

# 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

# 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

# 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

# 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

# 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

# 13

pilihan

During which phase of the action potential do voltage-gated sodium channels open?

  • Resting state
  • Depolarization
  • Repolarization
  • Hyperpolarization

# 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

# 15

pilihan

During resting potential, what is the state inside the axon?

  • More positive
  • More negative
  • Neutral
  • Equal to outside

# 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

# 17

pilihan

In which phase of action potential do voltage-gated potassium channels open?

  • Resting phase
  • Depolarization
  • Rising phase
  • Falling phase

# 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

# 19

pilihan

What structure is responsible for releasing neurotransmitters into the synaptic cleft?

  • Axon terminal
  • Dendrite
  • Node of Ranvier
  • Myelin sheath

# 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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