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The contractility of heart muscle is its?
contraction strength at any given fiber length
What is the difference between inotropic and cronotropic?
Inotropic refers to the force of contraction of the heart muscle, while chronotropic refers to the heart rate. Inotropic agents affect the strength of the heart's contractions, while chronotropic agents affect the heart rate.
Stimulation of which would cause an increase in heart rate and contraction strength?
beta 1 receptors
What can decrease the cardiac output?
The cardiac output can be decreased by decreasing the force of contraction of the ventricular myocardium and decreasing the heart rate.
What is inotropic effect?
Inotropic effect refers to the ability of a drug or agent to alter the force of contraction of the heart muscle. Positive inotropic agents increase the force of contraction, while negative inotropic agents decrease it. These effects can affect cardiac output and overall heart function.
Does activation of the parsympathetic nervous system increase heart rate but not the myocardial contraction strength?
No, the parasympathetic n.s. will slow the heart down, the sympathetic n.s. will increase heart rate.
What is the difference between inotropic and chronotropic drugs?
Inotropic drugs affect the force of contraction. Chronotropic affect the rate of contraction.
In what way do the parasympathetic and the sympatheticnervous systems work together?
Yes. The vagus nerve is a parasympathetic nerve that is almost always stimulating the healthy heart to have a heart rate less than the inherent rate of the SA node. The sympathetic innervation on the heart is minimal and only important during exercise.
Heartbeat is governed by what body system?
Heart muscles has there own rhythm of contraction. The sinoatrial node has the fastest rate of contraction. That is why it governs the rhythm of the heart. You have the control of the autonomic nervous system over the heart rate. Stimulation of the sympathetic nervous system increase the heart rate. Stimulation of the parasympathetic nervous system decrease the heart rate.
The Frank-Starling law of the heart describes the relationship between?
stroke volume, end-diastolic volume, and contraction strength
What term increases heart rate and contraction strength?
The term that increases heart rate and contraction strength is "sympathetic stimulation." This occurs when the sympathetic nervous system is activated, releasing hormones like adrenaline (epinephrine) that enhance cardiac output by increasing both the heart rate and the force of heart muscle contractions. This response is part of the body's "fight or flight" mechanism, preparing it for immediate physical activity.
What is myocardial contractility?
Cardiac contractility is the force of contraction possible for any given length of the cardiac muscle. It is related to the intracellular calcium levels.
