Chemical synapses are characterized by all of the following except (a) the release of neurotransmitter by the presynaptic membranes, (b) postsynaptic membranes bearing receptors that bind neurotransmitter, (c) ions flowing through protein channels from the presynaptic to the postsynaptic neuron, (d) a fluid-filled gap separating the neurons.
Chapter 23, the Respiratory System 23.1 – Functions of the Respiratory System 1. Respiration includes: a. Ventilation i. The movement of air into and out of the lungs. b. External respiration i. The exchange of gases between the air, lungs, and the blood. c. Gas transport i. The transport of oxygen and carbon dioxide in the blood. d. Internal respiration i. The exchange of gases between the blood and tissues. 2. Other functions of the respiratory system are: a. Regulation of blood pH. i. Altered by changing blood carbon dioxide levels. b. Production of chemical mediators. i. Angiotensinconver