Question 1

Which of the following best describes the primary contributors to the resting membrane potential in neurons?

Accepted Answer

The sodium-potassium pump, ion channels, and selective permeability of the cell membrane

Question 2

A neuron is exposed to a stimulus that is just below the threshold for generating an action potential. What is the most likely outcome?

Accepted Answer

A graded potential will occur, but no action potential will be generated

Question 3

Which statement best explains the 'all-or-none' principle of action potentials?

Accepted Answer

An action potential either occurs fully or not at all, once threshold is reached

Question 4

During the hyperpolarization phase of an action potential, which of the following is most likely occurring?

Accepted Answer

Prolonged opening of potassium channels, allowing K$$^+ to $$exit the cell

Question 5

A patient is unable to feel pain in a specific region of their body after a spinal cord injury. Which type of receptor is most likely affected?

Accepted Answer

Free nerve endings

Question 6

Which of the following best describes the function of pacemaker cells in cardiac muscle?

Accepted Answer

They spontaneously generate action potentials without external input

Question 7

A person enters a dark room after being in bright sunlight. Which type of receptor is primarily responsible for their increased sensitivity to light over time?

Accepted Answer

Tonic receptors

Question 8

Which of the following is a correct statement about graded potentials?

Accepted Answer

They vary in magnitude depending on the strength of the stimulus

Question 9

Which cranial nerve is purely sensory and responsible for vision?

Accepted Answer

Optic nerve

Question 10

A patient experiences referred pain in their left arm during a heart attack. What is the physiological basis for this phenomenon?

Accepted Answer

Sensory neurons from the heart and arm converge on the same spinal cord segments

Question 11

Which of the following best describes the function of thermoreceptors?

Accepted Answer

They detect changes in temperature

Question 12

A graded potential fails to reach the threshold in a neuron. What will happen next?

Accepted Answer

No action potential will be generated

Question 13

Which of the following is true regarding the absolute refractory period of a neuron?

Accepted Answer

No new action potential can be generated, regardless of stimulus strength

Question 14

Which of the following best explains why action potentials are unidirectional along an axon?

Accepted Answer

The refractory period prevents the action potential from traveling backward

Question 15

A researcher measures the membrane potential of a neuron and finds it to be $$-70\ \mathrm{mV}. $$Which of the following best describes this state?

Accepted Answer

The neuron is at its resting membrane potential

Question 16

Which of the following scenarios best illustrates the concept of a graded potential?

Accepted Answer

A postsynaptic neuron receives varying amounts of neurotransmitter, resulting in different levels of depolarization

Question 17

Which of the following best describes the role of the sodium-potassium pump in maintaining the resting membrane potential?

Accepted Answer

It actively transports 3 Na$$^+$$ ions out of the cell and 2 K$$^+$$ ions into the cell

Question 18

A person touches a hot stove and quickly withdraws their hand. Which type of receptor is primarily responsible for detecting the pain?

Accepted Answer

Nociceptors

Question 19

Which of the following is a characteristic of phasic receptors?

Accepted Answer

They adapt rapidly to a constant stimulus and stop responding

Question 20

A patient has difficulty tracking moving objects with their eyes. Which brain region is most likely affected?

Accepted Answer

The superior colliculus

Resting Membrane Potential and Neural Signaling

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