BIOL-242 Study Guide - Midterm Guide: Cardiac Output, Stroke Volume, Vagal Tone
14 May 2020
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Parasympathetic division: rest & digest, slows heart rate, stimulates digestion, removes waste & stores. The nervous system mainly innervates the sa and av nodes in the heart. Vagus nerve function: decreases heart rate reducing the heart rate/bp, reducing the force of contraction of the heart, vasoconstriction of the coronary arteries. Sympathetic division: the preganglionic fibres branch from the upper thoracic spinal cord and synapse in the lower cervical and upper thoracic ganglia. Postganglionic fibers extend from the ganglia to the cardiac plexus. Sympathetic nerves are responsible for: increasing heart rate, regulates unconscious actions, increase heart rate, accelerates respiratory rate, releases stored e (glucose), dilates pupils, inhibits things such as digestion and urination. Sympathetic cardiac nerve function: increase heart rate and force contraction. These two systems work side by side = autonomic tone. Electrocardiogram (ecg): composite of all ap"s generated by nodal & contractile cells at any given time. Used to check for heart conditions and record heart"s electrical signals.
