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 of the following is TRUE regarding receptive fields and sensitivity?

Accepted Answer

Smaller receptive fields result in greater sensitivity to stimuli.

Question 4

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

Accepted Answer

Chemoreceptors

Question 5

A root hair plexus is most sensitive to which type of stimulus?

Accepted Answer

Movement of hair

Question 6

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

Accepted Answer

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

Question 7

Which of the following best explains why phantom limb pain occurs after amputation?

Accepted Answer

Sensory pathways from the missing limb remain active in the CNS.

Question 8

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

Accepted Answer

Lateral spinothalamic tract

Question 9

A lesion in the medial lemniscus would most likely affect which type of sensation?

Accepted Answer

Fine touch and proprioception

Question 10

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 11

Which of the following is TRUE about the spinocerebellar pathway?

Accepted Answer

It conveys proprioceptive information to the cerebellum and does not reach conscious awareness.

Question 12

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 13

Which of the following is a function of baroreceptors?

Accepted Answer

Monitoring changes in blood pressure within elastic tissues of blood vessels

Question 14

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

Accepted Answer

Corticospinal pathway

Question 15

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 16

Which of the following is an example of a phasic receptor?

Accepted Answer

Root hair plexus

Question 17

A patient cannot sense the position of their limbs but can still feel pain and temperature. Which tract is most likely damaged?

Accepted Answer

Posterior column pathway

Question 18

Which of the following best explains the process of sensory adaptation?

Accepted Answer

A decrease in receptor sensitivity during constant stimulation

Question 19

Which equation best represents the threshold for action potential generation ($$V_{th}) in a $$sensory neuron?

Accepted Answer

$$V_{m} \geq V_{th}$$

Question 20

Which of the following is TRUE regarding the propagation of action potentials in myelinated axons?

Accepted Answer

Action potentials jump between nodes of Ranvier, increasing conduction speed.

Sensory Pathways and the Somatic Nervous System: Study Notes

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