Neuronal Structure and Function

What is the structure of a sensory neurone?

• A sensory neurone has a cell body, dendrites, an axon, and terminal endings.

• A sensory neurone consists only of a cell body and axon.

• A sensory neurone has no dendrites or terminal endings.

• A sensory neurone is made up of muscle fibers and connective tissue.

What is the function of a motor neurone?

• To regulate hormone levels in the body.

• The function of a motor neurone is to carry signals that control muscle movements.

• To facilitate the exchange of gases in the lungs.

• To transmit sensory information to the brain.

How do intermediate neurones connect sensory and motor neurons?

• Intermediate neurons connect sensory and motor neurons by processing and relaying signals between them.

• Intermediate neurons only connect with other intermediate neurons.

• Motor neurons bypass intermediate neurons to connect with sensory neurons.

• Intermediate neurons directly transmit sensory signals to muscles.

What role do sensory receptor cells play in detecting stimuli?

• Sensory receptor cells produce hormones in response to stimuli.

• Sensory receptor cells convert stimuli into electrical signals for the nervous system.

• Sensory receptor cells store stimuli for later use.

• Sensory receptor cells block stimuli from reaching the brain.

How do sensory receptor cells stimulate the transmission of impulses?

• Sensory receptor cells convert stimuli into electrical impulses that are transmitted to the brain.

• Sensory receptor cells release hormones that affect mood and behavior.

• Sensory receptor cells absorb stimuli and store them as memories.

• Sensory receptor cells create sound waves that travel to the ears.

Describe the sequence of events that leads to an action potential in a sensory neurone.

• An action potential in a sensory neurone is initiated by the depolarization of the membrane due to sodium ion influx, followed by repolarization through potassium ion efflux.

• An action potential is initiated by potassium ion influx and calcium ion efflux.

• Repolarization occurs due to chloride ion influx and sodium ion efflux.

• An action potential is triggered by calcium ion influx followed by sodium ion efflux.

What is the resting potential of a neurone?

• Approximately -90 mV

• Approximately -30 mV

• Approximately -70 mV

• Approximately -50 mV

How is the resting potential maintained in a neurone?

• The resting potential is maintained by the action of neurotransmitters.

• The resting potential is maintained by calcium channels only.

• The resting potential is maintained by the influx of chloride ions.

• The resting potential is maintained by the sodium-potassium pump and selective permeability of the neurone membrane.

What events occur during an action potential?

• Only depolarization occurs

• Repolarization is the only phase

• An action potential involves depolarization, repolarization, and hyperpolarization of the neuron's membrane.

• Action potentials do not involve hyperpolarization

How is the resting potential restored during the refractory period?

• The resting potential is restored by the outflow of potassium ions during the refractory period.

• The resting potential is maintained by the influx of sodium ions.

• The resting potential is stabilized by chloride ion release.

• The resting potential is restored by calcium ion absorption.