PSIO 202, Lecture 8

PSIO 202, Lecture 8 - PSIO 202 Human Anatomy and Physiology...

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PSIO 202 Human Anatomy and Physiology Lecture 8 Control of Heart Rate
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Objectives and Reading Assignment ± Reading: Tortora, pages 742-744 ± Objectives ± Measure HR from the EKG ± Define systole, diastole and contractility ± Describe how the autonomic nervous system (ANS) controls heart rate ± Explain how activation of the ANS changes neurotransmitter release leading to changes in HR ± Describe how oxygen and hormones influence HR and contractility
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ANS-review
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ANS- comparison of sympathetic and parasympathet ic divisions
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ANS- innervation of effector organs
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The Cardiac Cycle ± The cardiac cycle refers to all of the events associated with one heartbeat ± Systole is the period of ventricular contraction and blood ejection ± Diastole is the period of ventricular relaxation and filling ± Each cardiac cycle takes about 0.8 seconds at rest ± The cardiac frequency, or heart rate , can be computed from the cardiac cycle period
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Cardiac Cycle, Con’t.
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