Question 1

Which of the following best describes the role of a mechanoreceptor in the human body?

Accepted Answer

It responds to mechanical forces such as pressure or stretch.

Question 2

A mutation causes the cation channels in a rod photoreceptor to remain open even in the presence of light. What is the most likely effect on the photoreceptor's membrane potential?

Accepted Answer

The membrane will remain depolarized, similar to the dark state.

Question 3

Which of the following best explains how a stretch-sensitive channel in a plant cell might detect touch?

Accepted Answer

By changing conformation in response to membrane deformation, allowing ions to flow.

Question 4

A sensory neuron in the skin responds only when a specific area is touched. This area is known as the neuron's:

Accepted Answer

Receptive field

Question 5

Which of the following is the correct sequence of events in vertebrate phototransduction when light strikes a rod cell?

Accepted Answer

Retinal changes shape, opsin activates, cGMP decreases, cation channels close, cell hyperpolarizes.

Question 6

If a mutation prevents the synthesis of retinal in photoreceptors, what is the most likely consequence?

Accepted Answer

Photoreceptors will be unable to respond to light.

Question 7

Which of the following best defines a chemoreceptor?

Accepted Answer

A receptor that responds to specific chemical molecules.

Question 8

A scientist records from a neuron that increases its firing rate when a chemical is present but not when the area is touched or illuminated. What type of sensory receptor is most likely present?

Accepted Answer

Chemoreceptor

Question 9

Which of the following equations best represents the relationship between cGMP concentration and cation channel opening in vertebrate photoreceptors?

Accepted Answer

$$P_{open} \propto [cGMP]$$

Question 10

A patient has a genetic defect in opsin proteins, making them unable to change conformation in response to light. What is the most likely effect on vision?

Accepted Answer

The patient will be unable to detect light, resulting in blindness.

Question 11

Which of the following best describes the process of sensory integration?

Accepted Answer

The combination and processing of sensory information by the nervous system.

Question 12

If the receptive field of a sensory neuron is made smaller, what is the most likely effect on sensory perception?

Accepted Answer

Increased spatial resolution and ability to distinguish closely spaced stimuli.

Question 13

Which of the following is a direct result of photon absorption by retinal in a photoreceptor?

Accepted Answer

Retinal changes from 11-cis to all-trans configuration.

Question 14

A certain animal has photoreceptors that depolarize in response to light, unlike vertebrate rods and cones. Which of the following must be true about its phototransduction pathway?

Accepted Answer

Light causes cation channels to open.

Question 15

Which of the following best describes the function of a sensory receptor?

Accepted Answer

To convert a specific type of stimulus into an electrical signal.

Question 16

If a photoreceptor's cGMP-gated cation channels are blocked by a drug, what is the most likely effect on neurotransmitter release in the dark?

Accepted Answer

Neurotransmitter release will decrease.

Question 17

Which of the following is NOT a characteristic of a sensory neuron?

Accepted Answer

It integrates information from multiple sensory modalities.

Question 18

A researcher finds a neuron that responds to both touch and chemical stimuli but not to light. Which of the following is the best hypothesis about the neuron's sensory receptors?

Accepted Answer

It expresses both mechanoreceptors and chemoreceptors.

Question 19

Which of the following best describes the relationship between stimulus intensity and action potential frequency in a sensory neuron?

Accepted Answer

$$f_{AP} \propto I_{stimulus}$$

Question 20

Which of the following is the best example of perception in the context of sensory systems?

Accepted Answer

The brain interprets electrical signals from the retina as the image of a tree.

Sensory Systems: Mechanisms of Sensory Detection and Processing

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