Kinesiology 2230A/B Lecture Notes - Lecture 20: Heart Rate, Stroke Volume, Cardiac Muscle

• School: Western University
• Department: Kinesiology
• Course: Kinesiology 2230A/B
• Professor: Glen Belfry

Document Summary

Depolarization(sa node) through to atria av slows wave ,then you have contraction, then. Why you can feel your pulse - elasticity of arteries) Stops blood from leaving the heart and stops blood from retuning to the heart so blood pressure actually drops dramatically. When you see stars or feel dizzy it"s because your body is pulling all the blood back to the heart (out of the head) - decrease in blood flow to the brain. Diastolic pressure- pressure that"s maintained while heart fills, does not change - the elasticity of the arterial system is going to dictate this pressure. Systolic pressure is going to change with work rate, steady increase. The harder someone works the more capillaries are going to open the more oxygen that they need. As the radius increases in the muscle resistance to flow is going to decrease dramatically.