Which electrical event is characteristic of inhibi

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Question 1 of 5

Which electrical event is characteristic of inhibitory synaptic interactions?

A. A neurotransmitter agent that selectively opens ligand-gated chloride channels is the basis for an inhibitory postsynaptic potential B. A neurotransmitter that selectively opens potassium channels will allow potassium to move into the cell C. Because the Nernst potential for chloride is about -70 mV, chloride ions tend to move out of the cell along its electrochemical gradient D. An increase in the extracellular sodium concentration usually leads directly to an inhibitory postsynaptic potential

Correct Answer: A

Rationale: Opening chloride channels causes hyperpolarization, characteristic of inhibition. TMP13 p. 589

Question 2 of 5

A 25-year-old student with 20/20 vision looks up from his book to view his girlfriend sitting on the other side of the room. Which of the following is most likely to occur when the student changes his view from his book to his girlfriend?

A. Thicker lens, contraction of ciliary muscle B. Thicker lens, relaxation of ciliary muscle C. Thinner lens, contraction of ciliary muscle D. Thinner lens, relaxation of ciliary muscle

Correct Answer: D

Rationale: Distant vision requires a thinner lens, achieved by ciliary muscle relaxation. TMP13 pp. 639-640

Question 3 of 5

Olfactory receptor cells belong to which group of cells?

A. Bipolar neurons B. Fibroblasts C. Modified epithelial cells D. Multipolar neurons

Correct Answer: A

Rationale: Olfactory receptor cells are bipolar neurons from the CNS. TMP13 p. 689

Question 4 of 5

Which cranial nerve is correctly paired with the extra ocular muscle it innervates?

A. Abducens nerve-medial rectus B. Oculomotor nerve-inferior oblique C. Oculomotor nerve-lateral rectus D. Oculomotor nerve-superior oblique

Correct Answer: B

Rationale: The oculomotor nerve (III) innervates the inferior oblique muscle. TMP13 p. 666

Question 5 of 5

The function of the round window can best be described by which statement?

A. It provides the connection point for the stapes B. It serves to damp out low frequency sounds such as your own voice C. It transmits the frequency information into the cochlea from the tympanic membrane D. It serves as the pressure relief valve for the cochlea

Correct Answer: D

Rationale: The round window relieves pressure from stapes movement at the oval window. TMP13 p. 675

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Which electrical event is characteristic of inhibitory synaptic interactions?

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Medical Surgical Nursing Neurological Disorders Quizlet Questions

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