The gray matter of the primary somatosensory cortex contains six layers of cells. Which layer(s) receive the bulk of incoming signals from the somatosensory nuclei of the thalamus?

Correct Answer: D

Rationale: Layer IV receives the majority of thalamic somatosensory input. TMP13 p. 612

Correct Answer: D

Rationale: Cataracts result from protein coagulation in the lens, causing opacity. TMP13 p. 642

Correct Answer: B

Rationale: Visual detail analysis occurs in the inferior ventral and medial occipital/temporal cortex. TMP13 pp. 662-664

Correct Answer: C

Rationale: Light activates transducin and phosphodiesterase, increasing cGMP hydrolysis and metarhodopsin II, but cAMP remains unchanged. TMP13 pp. 650-652

Correct Answer: C

Rationale: Photoreceptors hyperpolarize upon light activation, unlike most receptors. TMP13 p. 650