The Organ of Corti when stimulated will allow passive movement of _____ ion into the hair cells that become depolarized and release the neurotransmitter that stimulate the cochlear nerve. The ciliary body of the eye secretes aqueous humor into the posterior chamber. The fluid flows to the anterior chamber into the canal of Schlemm which returns it to the venous blood. If this flow is blocked the inner eye pressure (intraocular pressure) increases and may cause _____. A gradual increase in photoreceptor sensitivity is known as dark adaption and is due to an increase in the pigment _____ of the _____ cells. In the presence of light, the rod cells lose K+ and hyperpolarizes, this results in an increase or decrease (choose one) release of an inhibitory neurotransmitter to bipolar cells which is then able to stimulate ganglion cells and send a signal to the brain. Adenylate Cyclase-cAMP, _____ _____ and _____ are three types of Second-Messenger Systems utilized by hormones that cannot pass through the lipid barrier of the target cell’s plasma membrane. The binding of myosin motors to actin myofilaments is referred to as a _____. The _____ _____ releases mineralocorticoids such as Aldosterone, which helps kidneys to retain Na^+ and water while excreting K^+. Alpha cells of the Pancreatic islets release _____ when blood glucose levels are _____.