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Why is there a brief period at the beginning of ventricular contraction where there is no change in volume?
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Why is it necessary for the ventricular action potential to have a relatively long absolute refractory period?
The ventricular action potential has a long refractory period so that the mechanical response of the ventricle will be discrete; one coordinated mechanical response per electrical activation sequence. Otherwise, with additional electrical stimuli, the mechanical responses would summate producing a prolonged contraction.
What does systole refer to?
The period of time marked by contraction of the ventricles
Inability of muscle fibers to contract after a long period of contraction?
muscle fatigue
What occurs when ventricular diastole takes place?
Ventricle diastole is the period during which the ventricles are relaxing. During ventricular diastole, the pressure in the (left and right) ventricles drops from the peak that it reaches in systole. When the pressure in the left ventricle drops to below the pressure in the left atrium, the mitral(bicuspid) valve opens, causing accumulated blood from the atrium to flow into the ventricles.
Which period of Egyptian occurred closest to the beginning of the common era?
The ptolemaic dynasty. (APEX)
What is the ventricular contraction period?
This is called the systole :)
How long is the ventricular contraction period?
0.3 Seconds
The contraction of the ventricles is referred to as systole and the period of ventricular relaxation is called?
I believe that is called diastole, in contrast to systole, the contraction of the heart muscles.
What happens to the volume of blood in the ventricle during the period of isovolumetric contraction?
Both ventricular contraction and atrial diastole take place.
What is the short amount of time between the time of stimulation and the beginning of contraction in a skeletal muscle?
latent period
How long is the quiescent period?
0.4 seconds, ventricular contraction is 0.3. It goes 1.A 2.D 3.B 4.C
During which portion of the cardiac cycle is it possible to induce extra systole?
Extrasystole is an extra ventricular systole that happens during the begging of relaxation (repolarization). Since the cardiac is able to depolarize only after repolarization, any stimulus upon the repolarization period created an increased ventricular contraction or which is also called extrasystole but not a new contraction.
Brief delay that occurs between application of the stimulus and the beginning of contraction?
Latent Period
Is the 2nd heart sound in the period of isometric contraction?
no. it occurs at the beginning of isovolumetric relaxation.
Why is it necessary for the ventricular action potential to have a relatively long absolute refractory period?
The ventricular action potential has a long refractory period so that the mechanical response of the ventricle will be discrete; one coordinated mechanical response per electrical activation sequence. Otherwise, with additional electrical stimuli, the mechanical responses would summate producing a prolonged contraction.
What significant cultural change marks the beginning of the post classical period?
The fall of classicism, Huns, and Byaztine marks the beginning of the ppost classical period
What period represents the greatest cardiac volume?
ventricular systole
