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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 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.
What occurs during relaxation period?
During the relaxation period, muscle fibers return to their resting state after contraction. Calcium ions are reabsorbed into the sarcoplasmic reticulum, leading to a decrease in calcium concentration in the cytoplasm. This allows myosin and actin filaments to detach, causing the muscle to lengthen and relax. Overall, this phase is crucial for preparing the muscle for the next contraction cycle.
Which period of Egyptian occurred closest to the beginning of the common era?
The ptolemaic dynasty. (APEX)
As the time period of an object's momentum change becomes longer the force needed to cause this change becomes?
As the time period of an object's momentum change becomes longer, the force needed to cause this change decreases. This is because a longer time period allows for the change in momentum to occur more gradually, reducing the peak force required.
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.
How long is the ventricular contraction period?
The ventricular contraction period, also known as systole, typically lasts about 0.3 seconds in a healthy adult heart. This is the phase when the ventricles contract to pump blood out of the heart.
What is the period of isovolumetric contraction is immediately followed by?
The period of isovolumetric contraction is immediately followed by the period of ventricular ejection in the cardiac cycle. During isovolumetric contraction, the ventricles contract while all valves are closed, and this is followed by the opening of the semilunar valves to allow blood to be ejected from the heart during ventricular ejection.
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
What is the ventricular contraction period?
The ventricular contraction period refers to the phase of the cardiac cycle when the ventricles of the heart are contracting to pump blood out to the lungs and the rest of the body. This stage is also known as systole. It is an essential part of the overall heart function in maintaining blood circulation throughout the body.
The atrioventricular valves are closed during the entire period of?
The atrioventricular valves are closed during the entire period of ventricular contraction to prevent blood from flowing back into the atria. This closure ensures that blood is pushed out of the ventricles and into the arteries.
How long is the quiescent period?
0.4 seconds, ventricular contraction is 0.3. It goes 1.A 2.D 3.B 4.C
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.
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.
