Question 1

Which of the following best describes the function of tonic sensory receptors?

Accepted Answer

They are always active and generate action potentials at a frequency that reflects the level of stimulation.

Question 2

A patient presents with loss of fine touch sensation in the right hand. Which sensory pathway is most likely affected?

Accepted Answer

Posterior column pathway

Question 3

Which type of sensory receptor is responsible for detecting changes in blood pH?

Accepted Answer

Chemoreceptor

Question 4

If a stimulus depolarizes a sensory receptor cell to threshold, what is the next event in the sensory pathway?

Accepted Answer

Action potential generation

Question 5

Which of the following is true regarding receptive fields and sensitivity?

Accepted Answer

Smaller receptive fields result in greater sensitivity to stimuli.

Question 6

Which pathway carries sensations of pain and temperature to the brain?

Accepted Answer

Lateral spinothalamic tract

Question 7

A person experiences phantom limb pain after an amputation. Which pathway is most likely involved in this sensation?

Accepted Answer

Spinothalamic pathway

Question 8

Which of the following is a correct sequence of neurons in a typical sensory pathway?

Accepted Answer

First-order neuron → Second-order neuron → Third-order neuron

Question 9

Which equation best represents the relationship between stimulus intensity and action potential frequency in tonic receptors?

Accepted Answer

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

Question 10

Which of the following best explains why you cannot sense the position of your spleen?

Accepted Answer

Visceral proprioceptors do not provide conscious sensation.

Question 11

Which motor pathway is primarily responsible for voluntary control of skeletal muscles?

Accepted Answer

Corticospinal pathway

Question 12

A lesion in the left posterior column pathway at the level of the medulla would most likely result in loss of which sensation?

Accepted Answer

Fine touch and proprioception on the right side of the body

Question 13

Which of the following is true about phasic sensory receptors?

Accepted Answer

They are normally inactive and respond only to changes in stimulus.

Question 14

Which equation describes the conduction velocity ($$v) of an $$action potential in a myelinated axon as a function of axon diameter ($$d$$)?

Accepted Answer

$$v \propto d$$

Question 15

Which sensory receptor is most likely to be activated by hair movement on the skin?

Accepted Answer

Root hair plexus

Question 16

Which of the following best describes the role of the thalamus in sensory pathways?

Accepted Answer

It acts as a relay and sorting center for sensory information before reaching the cortex.

Question 17

Which pathway conveys proprioceptive information to the cerebellum but does not reach conscious awareness?

Accepted Answer

Spinocerebellar pathway

Question 18

Which of the following is a function of baroreceptors?

Accepted Answer

Monitoring changes in pressure within organs

Question 19

Which equation best represents the relationship between the number of sensory neurons ($$N) $$and the area of receptive field ($$A) $$for a given region?

Accepted Answer

$$A \propto \frac{1}{N}$$

Question 20

Which of the following best explains why only about 1% of arriving sensory information reaches the primary somatosensory cortex?

Accepted Answer

Most sensory information is filtered out or processed subconsciously by the CNS.

Sensory Pathways and the Somatic Nervous System: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard