Potassium channels help set the resting membrane potential of the cell. Vesicles are more numerous in the presynaptic junction than in the postsynaptic junction. Protein synthesis occurs in the post-synaptic junction. The hypothalamus controls circadian rhythms. Local blood vessels allow hormones released by the hypothalamus to reach the pituitary directly without going through the rest of the body.
Growth hormone is made by the pituitary.
Most sensory nerves do not spontaneously generate action potentials. The senses of taste and smell are functionally similar, using similar transduction mechanisms. Hair cells of the inner ear are used to provide information about head position and acceleration. Each cone cell contains three different types of photosin that absorb red, green, and blue light, respectively. Photoreceptors are most dense near the fovea.