8 Questions
What is the main factor that influences the forcefulness of heart contraction?
Contractility
Which regulatory measure ensures that if more blood is returned to the heart, more blood is ejected in the next heartbeat?
Frank-Starling law
Which factor refers to the pressure that must be exceeded before the semilunar valves open and ventricular ejection begins?
Afterload
In the context of heart regulation, which factor refers to the stretch on the heart before it contracts?
Preload
Which part of the nervous system is the origin of heart rate regulation?
Cardiovascular center in medulla oblongata
What are the two main hormones that influence heart rate regulation?
Epinephrine and norepinephrine
Which of the following is NOT a factor that influences heart rate regulation?
Baroreceptors
What influences heart rate regulation through ionic imbalances of Na+, K+, and Ca2+?
Cations
Learn about the Cardiac Conduction System which includes the Sinoatrial (SA) node, Atrioventricular (AV) node, AV bundle, bundle branches, and Purkinje fibers. Understand the pathway through which electrical excitation progresses in the heart for each cycle of cardiac excitation.
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