BIOL 031 Lecture Notes - Lecture 11: Parasympathetic Nervous System, Sympathetic Nervous System, Stroke Volume
18 Aug 2020
School
Department
Course
Professor
Document Summary
Sympathetic increases conduction velocity through node. Decreases in the delay conduction between atrium and ventricles. Shortens time it takes for ap to travel through ventricles. Parasympathetic decreases conduction velocity through node. Delay is increased between atrium and ventricle. Epinephrine same effect as sympathetic nervous system. Thyroid hormones, glucagon increases heart rate. Ventricles are never completely empty of blood. More forceful contraction will expel more blood. Extrinsic control of stroke volume (how much volume can get out of ventricle) Measure of ventricles capacity for generating force. Thyroid hormones, insulin and glucagon increase force of contraction. Increased filling time, greater volume in ventricle. Afterload = pressure in aorta during ejection. Ventricular muscle is working against atrial pressure. Left ventricle is connected to aorta, increases as the arterial pressure goes up. Cardiovascular physiology: blood vessels, blood flow, blood pressure. Physical laws governing blood flow and blood pressure. Drives blood pressure from an area of high pressure to low pressure.
