Question

for each, what is the right answer?

13. Which of the following is an example of substrate-level regulation of hormone secretion? A) Plasma testoterone concentrations affect the rate of GnRH secretion B) Plasma calcium concentrations affect the rate of parathyroid hormone secretion C) Plasma dopamine cocentrations affect the rate of prolactin secretion. D) Sensory neural stimuli affect the rate of oxytocin secretion. E) Plasma GnRH concentrations affect the rate of FSH secretion 14. The receptive field of an afferent neuron A) refers to the number of interneurons with which the central process of the afferent neuron makes synaptic contact via divergence. B) refers to the region of the body that, when stimulated by a specific stimulus, gives rise to graded potentials in the receptors synapsing with that neuron. C) is correlated with the number and length of branches on the dendritic processes of that neuron. D) Both (A) and (C) are correct. E) Both (B) and (C) are correct 15. There is an old saying, "All cats are gray at dusk." (Dusk is the final darkest stage of twilight, as the sun sets each evening... and yes, this is a saying). Which of the following statements explains this saying? A) Rods and cones are stimulated equally, but the brain does not know how to process this confusing information, so the resulting color is gray. B) In dim light, only rods are stimulated, and because rods detect black and white, the resulting image is of a gray cat. C) Neither rods nor cones are stimulated at dusk. D) At dusk, only cones are stimulated, and they are equally stimulated. The combination of all the cone colors is gray. 16. Accommodation for near vision requires A) contraction of the ciliary muscles. B) contraction of external eye muscles. C) activation of the sympathetic nervous system D) elongation and flattening of the lens. 17. The reticular formation of the brain A) sends and receives information from many regions of the CNS. B) is not essential for life. C) is the site where memories are stored. D) secretes melatonin. E) is located within the cerebellum 18. Which of the following statements about acetylcholine is correct? A) It is the neurotransmitter of postganglionic sympathetic neurons. B) It can cause either contraction or relaxation of skeletal muscle fibers. C) It binds to cholinergic receptors. D) Its synthesis is catalyzed by acetylcholinesterase enzyme. E) Both (A) and (B) are correct.

Answer 1

Answers is

13) A

14) D

15) B

16) A

17) E

18) E

Hormonal secration will be happens glands

Near vision eyes required ciliray muscle