T/F The blood flow slows down in the capillaries because the increased total area of the capillary >>True is very large. - ANSWER pulmonary circuit and systemic circuit The heart contains two circuits. Name them. - ANSWER>> When you inhale which set of muscles uses the least amount of ATP and triggers the Diaphragmatic muscles parasympathetic nervous system? - ANSWER>> T/F When the ventricles contract blood is pushed out into the artery and the artery stretches because of its elastic layers allowing the blood to continue to flow into the circulatory system True while the ventricle is relaxing. - ANSWER>> Microglia: List the 4 types of glial cells and list a phrase to describe their function. - ANSWER>>- Are part of the cellular immune system to protect the brain since the humoral immune system usually cannot cross the BB barrier. - Astrocytes: Contribute to the blood brain barrier - Schwann Cells: myelinates axons of the neurons in the PNS - Oligodendrocytes: Myelinates axons of the neurons of the CNS Briefly explain why the action potential flows only from the axon hillock to the terminal web. - The action potential originates from the axon hillock which initiates the flow of the