Question 1

Which type of receptor is primarily responsible for detecting changes in blood osmolarity, and what is the physiological consequence of its activation?

Accepted Answer

Interoceptor; stimulates homeostatic responses such as ADH release

Question 2

A patient presents with impaired habit formation and difficulty learning new motor routines. Which brain structure is most likely affected?

Accepted Answer

Basal nuclei

Question 3

During a somatic reflex, which type of muscle is activated, and what is the pathway of the afferent axon?

Accepted Answer

Skeletal muscle; afferent axon travels toward the CNS

Question 4

Which of the following mechanisms is NOT involved in the inactivation of neurotransmitters at a synapse?

Accepted Answer

Synthesis

Question 5

Olfactory sensory neurons detect odor molecules using which type of receptor, and what is the typical downstream effect?

Accepted Answer

7 transmembrane G-protein coupled receptors; activation of second messenger pathways

Question 6

Which tract conveys pain sensory information via the spinal anterolateral system to the contralateral reticular formation in the brain stem?

Accepted Answer

Spinoreticular tract

Question 7

A local, graded change in membrane potential produced in a receptor by sensory transduction is called a:

Accepted Answer

Generator potential

Question 8

Which nuclei are part of the cerebrum but not of the cerebral cortex, and what is their primary function?

Accepted Answer

Basal nuclei; motor control and habit formation

Question 9

In the contralateral extensor reflex, which neuron’s axon crosses to the other side of the spinal cord to activate the motor neuron causing extension?

Accepted Answer

Interneuron

Question 10

Which area of the left parietal cortex is involved in the comprehension of speech, and what is the clinical consequence of its damage?

Accepted Answer

Wernicke’s area; receptive aphasia

Question 11

Which of the following is a correct description of an IPSP in a postsynaptic neuron’s membrane potential?

Accepted Answer

A hyperpolarization

Question 12

Axon tracts that travel from one region of ipsilateral cortex to another are called:

Accepted Answer

Association tracts

Question 13

The Reticular Activating System (RAS) is distributed throughout which region and is important for regulation of attention and consciousness?

Accepted Answer

Brainstem

Question 14

Which of the following is true regarding the right and left cerebral hemispheres?

Accepted Answer

They process related but different aspects of various inputs and generate different sorts of outputs

Question 15

Activation of G-Protein coupled receptors often leads to changes in which of the following?

Accepted Answer

All of the above: enzyme activity, ion channel open state, and gene expression

Question 16

In the medulla oblongata, the pyramids contain which type of fibers?

Accepted Answer

Corticospinal tracts

Question 17

Which of the following sensory receptors is correctly matched with its modality?

Accepted Answer

Photoreceptor; light

Question 18

A patient with a lesion in the spinoreticular tract would most likely experience deficits in which sensory function?

Accepted Answer

Pain perception and arousal

Question 19

If a neurotransmitter is removed from the synaptic cleft by diffusion, reuptake, and enzymatic degradation, which equation best describes the total rate of inactivation ($$R_{total}) if $$each mechanism has a rate constant ($$k_1$$, $$k_2$$, $$k_3) $$and concentration $$[NT]$$?

Accepted Answer

$$R_{total} = (k_1$ + k_2$ + k_3$)[NT]$$

Question 20

A patient is unable to comprehend spoken language but can speak fluently, although their speech lacks meaning. Which cortical area is most likely damaged?

Accepted Answer

Wernicke’s area

BIO 259 Exam 4 Study Guidance – Nervous System and Sensory Physiology

Study Guide - Practice Questions

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