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Questions and Answers
What is the main factor that influences the forcefulness of heart contraction?
What is the main factor that influences the forcefulness of heart contraction?
- Contractility (correct)
- Frank-Starling law
- Afterload
- Preload
Which regulatory measure ensures that if more blood is returned to the heart, more blood is ejected in the next heartbeat?
Which regulatory measure ensures that if more blood is returned to the heart, more blood is ejected in the next heartbeat?
- Contractility
- Preload
- Afterload
- Frank-Starling law (correct)
Which factor refers to the pressure that must be exceeded before the semilunar valves open and ventricular ejection begins?
Which factor refers to the pressure that must be exceeded before the semilunar valves open and ventricular ejection begins?
- Afterload (correct)
- Contractility
- Frank-Starling law
- Preload
In the context of heart regulation, which factor refers to the stretch on the heart before it contracts?
In the context of heart regulation, which factor refers to the stretch on the heart before it contracts?
Which part of the nervous system is the origin of heart rate regulation?
Which part of the nervous system is the origin of heart rate regulation?
What are the two main hormones that influence heart rate regulation?
What are the two main hormones that influence heart rate regulation?
Which of the following is NOT a factor that influences heart rate regulation?
Which of the following is NOT a factor that influences heart rate regulation?
What influences heart rate regulation through ionic imbalances of Na+, K+, and Ca2+?
What influences heart rate regulation through ionic imbalances of Na+, K+, and Ca2+?
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