Principles of Biology
Principles of Biology
2nd Edition
ISBN: 9781259875120
Author: Robert Brooker, Eric P. Widmaier Dr., Linda Graham Dr. Ph.D., Peter Stiling Dr. Ph.D.
Publisher: McGraw-Hill Education
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Chapter 36.3, Problem 2TYK
Summary Introduction

Introduction:

The myogenic heart is electrically excitable and initiates its own action potential. The nervous system regulates the rate and force required for the beating of myogenic heart.

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What keeps the atrioventricular (AV) valves from being pushed open as the ventricles contract? Pressure of blood pushing against the valves. Contraction of the atria. Closure of the semilunar valves. Contraction of papillary muscles and tightening of chordae tendineae.
All valves are closed, ventricular pressure decreases. Blood flows passively through the atria and AV valves. All valves are closed; ventricular pressure increases. Blood is forced through the semilunar valves by high pressure. Receiving chamber pressure increases; more blood exits through AV valves. Left atrium: Right atrium- Left ventricle Right ventricle- Ventricular filling Atrial contraction Mid-to-late diastole (ventricular filling) Isovolumetric Ventricular contraction phase ejection phase Ventricular systole (atria in diastole) Isovolumetric relaxation 3 Early diastole
The heart is resting during Select one: ventricular systole. the ejection period. ventricular diastole. atrial systole.
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