PHYL 2044 Lecture Notes - Lecture 9: Cardiac Output, Stroke Volume, Autonomic Nervous System
22 Feb 2019
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Phyl 2044 lecture 9 february 5, 2019 regulation of cardiac output and integrated cv function. Preload (load before the heart contracts), afterload (resistance/pressure in the arteries), and contractility (strength of the muscle itself)) Cardiac output is l/min, is how much we have over time coming out of the heart. We can vary how fast the heart is beating (heart rate) or we change how much ejected each beat (stroke volume) to change cardiac output. Heart rate regulation: autonomic nervous system primary controller of heart rate, both divisions (sympathetic and parasympathetic) influence sinoatrial node activity. Heart rate regulation is primiarly controlled by the. Ans, which is divided between the sns and pns. Accordingly, if green is the sa node ap, sympathetic stimulation increases heart rate by increasing the rate of diastolic depolarization. Inside the heart, there are lot of nerve endings, innervating the sa node. The blue bar represents the stimulation of the sns.
