Under low or reduced light conditions, which chemical compound is responsible for the inward-directed sodium current in the outer segments of the photoreceptors?

Correct Answer: B

Rationale: In low light, high cGMP levels keep sodium channels open, causing the dark current. TMP13 pp. 650-651

Correct Answer: C

Rationale: Rods and cones release glutamate to synapse with bipolar cells. TMP13 p. 655

Correct Answer: B

Rationale: Aqueous humor flows from the canal of Schlemm into aqueous veins. TMP13 p. 645

Correct Answer: A

Rationale: Communication will be facilitated and less frustrating to the patient when questions that require a 'yes' or 'no' response are used. When the language areas of the brain are injured, the patient might not be able to read or recite words, which will frustrate the patient without improving communication. Expressive aphasia is caused by damage to the language areas of the brain, not by the areas that control the motor aspects of speech. The nurse should allow time for the patient to respond.

Correct Answer: C

Rationale: In an unconscious patient with cerebral hemorrhage, airway protection is the priority. Suctioning saliva prevents aspiration, which could worsen the condition. Passive ROM, electrolyte monitoring, and documentation are secondary to maintaining a patent airway.