LIFESCI 2 Lecture Notes - Lecture 14: Autonomic Nervous System, Spinal Cord, Heart Rate
Document Summary
Brain is the only a part of the central nervous system. Peripheral: made of anything else with nervous tissue. Any action we do, there is something being perceived. Enters through peripheral and goes to the central. Received by sensory (afferent) neurons: what"s being received could be anything important: Information you"re unaware of (ph of blood, oxygen levels) Information you are aware of (temperature in the room) Sympathetic: fight or flight (stressful situation or exercise) Either one branch is on and the other is off or vice versa. They are never on at the same time. One system increases activity, while the other does the opposite. Dual innervation of visceral organs, usually producing opposite effects. If you were sitting on the couch and look down on your arm to see a big spider. All of the following are likely to occur except: Heart rate increases, pupils open to see more.
