BIPN 100 Lecture Notes - Lecture 13: Group C Nerve Fiber, Postganglionic Nerve Fibers, Preganglionic Nerve Fibers
11 Jun 2017
School
Department
Course
Professor
Document Summary
You can increase an ap by increasing the diameter of the fiber. B fibers are medium and myelinated somewhere around where a deltas are. The autonomic nerve system is made up of b fibers. Be able to speak about property of fibers that allow for the increase in speed of aps. Somatic motor system (voluntary movement) moving of limbs. Autonomic nervous system (involuntary) do not think about these things b/c they happen involuntarily (e. g. digestion, heart pumping etc) Sympathetic- activated by activity, stress, or lowering of blood pressure. Increase heart rate and decreases motility in gut causing dilated pupils (see clearer) and bronchioles (get more air into lungs). People typically mistake the sympathetic system for turning up activity and the parasympathetic to turning down activity, but this is not true. What happens when you activate the sympathetic is that you increase heart rate, decreases motility in gi tract, pupils and bronchioles become dilated preparing you to engage with something stressful.
