A. Light B. Transmitter release from the photoreceptor cells of the retina 56. A. FSH binding to granulosa cells B. Follicular development 57. A. Sympathetic stimulation B. Contractility of the heart 58. A. VA B. Oxygen bound to hemoglobin 59. A. Alpha motor nerve action potential frequency B. Skeletal muscle action potential frequency 60.
Myelin reduces the length constant.
Recurrent inhibition reduces the action potential frequency in alpha motor nerves. Postganglionic parasympathetic neurons release the transmitter acetlycholine. The axons of preganglionic sympathetic neurons are long compared to parasympathetic preganglionic nerves. The perception of sound involves the bending of hair cells in the organ of corti. High plasma calcium inhibits the release of parathyroid hormone.