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contraction strength at any given fiber length
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∙ 15y ago
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Muscle tissue is characterized by its?
contractility
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.
Why does contractility of the cardiac muscle increase with increased filling?
It doesn't - "contractility" refers to the force generated at any given length of muscle. Therefore although the force of contraction does increase with filling, the contractility does not.The reason the force of contraction increases with filling is because filling stretches the heart muscles. Increased stretch causes an increase in force of contraction.Contractility changes because of changes in the level of intracellular calcium. This can be changed by things such as adrenalin (epinephrine), which increases contractility and β blockers, which decrease contractility.
What decreases cardiac output without change in heart rate PAWP or SVR Is it preload afterload or contractility?
A change in cardiac output without any change in the heart rate, pulmonary artery wedge pressure (PAWP = equated to preload) or systemic vascular resistance (SVR = afterload) would have to be due to a change in the contractility of the heart. Cardiac output (CO) is roughly equal to stroke volume x heart rate. Stroke volume is related to preload, contractility, and afterload. As you can see, the only variables you have not controlled for is cardiac contractility.
What is the sympathetic effect on stroke volume?
increased contractility
What has the author Jozef Zachar written?
Jozef Zachar has written: 'Electrogenesis and contractility in skeletal muscle cells' -- subject- s -: Excitation - Physiology -, Muscle cells, Muscle contraction
What function of muscle tissue does not belong ability to shorten contractility pulls on bones stretchability?
Stretchability does not belong to the functions of muscle tissue. While muscle tissue is stretchable to a certain extent, its primary function is not related to stretching or elongating. The main functions of muscle tissue are the ability to shorten or contract (known as contractility) and to pull on bones (known as pulling or moving bones).
A Short term mechanisms for regulating blood pressure include regulating what three things?
vessel diameter, heart rate, heart contractility
What are the Seven special properties of cardiac muscle?
- rhythmicity : capability of rhythmic self-excitation therefore no need for external control -conductivity: conduction of action potential along specialised muscle cells. -excitability: ability of muscle fibers to get exited . -contractility; ability of cardiac muscle to contract . It also has a long refractory period meaning it cant tetanus
Which class of medication maximizes cardiac performance in clients with heart failure by increasing ventricular contractility?
Diuretics
What will the sympathetic nervous system do to the cardic muscle?
Sympathetic nervous system activation will increase the frequency and force of cardiac myocyte contractility
Muscle tissue has four characteristics what are they?
Contractility - the ability of a muscle to shorten. Extensibility - the ability to lengthen. Elasticity - the ability to return to their original shape. And, Excitability - can be triggered by electrical stimulation.
