Which of the following statements is/are TRUE Plasma membrane of cone photorecep

Question

Which of the following statements is/are TRUE Plasma membrane of cone photoreceptor segments is heavily invaginated. Plasma membrane of rod photoreceptor outer segments is heavily invaginated. The retinal pigment epithelium controls the amount of light that passes into the lens. Photoreceptors are the first cells in the retina that are exposed to light All of the above are true. Which of the following molecules becomes active during transduction in rods? Adenylate cyclase Phosphodiesterase TRPC channels HCN channels All of the above Which of the following statements is/are TRUE? Center-surround receptive field organizations are characteristics of many neurons in visual and somatosensory systems Tonic receptors in somatosensory systems adapt rapidly to a continuous stimulus Mechanosensitive channels can be readily activated by polar carbohydrates such as glucose Sensory acuity is highest in areas where sensory neurons have very large receptive fields All of the

Explanation / Answer

9. Rods and cone photoreceptor have almost the same structure, their outermost membrane is heavily invaginated, so the answer is a. and b. options are true.

10. b. Phosphodiesterase is the right answer choice. As this enzymes linked with rhodopsin behavior, activated G-protein turns transduction on thereby this enzyme is turned on. Phosphodiesterase role is converting cGMP to GMP thereby closing sodium ion channel.

11. a. Receptive fields have been identified as a conjunction for many neurons of the auditory system, the somatosensory system, and the visual system.

12. e. All of the above are true,

TRPV 1 channels are intrinsically heat sensitive, TRPM8 channels are cold sensing and menthol sensitive, TRPA 1 channels are mustard oil and pungent roots such as wasabi and raddish smell sensitive, a potent imflmatory agent.

13. As new ATP attaches to the myosin head, it detaches from the cross-bridge, c. release of the myosin head and re-cocking of the myosin head group.

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