8. In a reflex arc, the efferent neuron must synapse with an afferent neuron a.

Question

8. In a reflex arc, the efferent neuron must synapse with an afferent neuron a. True b. False 9. Make the sentence below a true statement. When Stereocilia on hair cells are bent toward the tallest, a G protein system is initiated which ultimately causes K+ to move into the hair cell thereby hyperpolarizing the membrane opening Ca2* channels and releasing neurotransmitter. 10 can enter the brain by moving through a) small non-polar molecules; capillary membranes b) small non-polar molecules; capillary pores c) small non-polar molecules; gap junctions d) small polar molecules; capillary pores e) small polar molecules; capillary membranes 11. Which hormone(s) in Fig 1 (below) stimulates remains of a follicle to form corpus luteum? b. 2b b. 3b C. 4b d. 3b and 4b 2b la lb 2a 3a 3b 4a 4b Fig. 1. Part a of each curve occurs before the dotted vertical line; part b occurs after

Explanation / Answer

Ans. 1 True In a reflex arc the afferent neuron must synapse with the efferent neuron and generally found in the spinal cord or brain.

Ans 2. When Stereocilia cells are bend towards one direction hair cell depolarises and when it bend towards other direction hyperpolarization occurs. It is characterised by the entrance of K+ ions and which leads to depolarization. This depolarization opens the voltage gated calcium Ca 2+ ion channels. This inturn releases the neurotransmitter. It is performed by ion channeled receptors.

Ans3. Small non polar molecules can enter the brain by moving through capillary membranes.

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