The Term Systole Refers To

SYSTOLE- is the contraction of the muscle. DIASTOLE- is relaxation of the muscle. The contraction and relaxation of the ventricles are normally described with the terms systole and diastole.

What is systole in blood circulation?

Systole and diastole are two phases of the cardiac cycle that occur as the heartbeats, which pump blood through the system of blood vessels carrying blood to each part of the body. Systole occurs when the heart contracts, pumping blood out, while diastole takes place when the heart relaxes after contraction.

Is systole a contraction?

Cardiac systole is the contraction of the cardiac muscle in response to an electrochemical stimulus to the heart's cells (cardiomyocytes). Cardiac output is the volume of blood pumped by the ventricles in one minute.

Is systole a contraction or relaxation?

The cardiac cycle is essentially split into two phases, systole (the contraction phase) and diastole (the relaxation phase). Each of these is then further divided into an atrial and ventricular component.

Which best describes systole?

Systole is best described as the period that starts when the heart is maximally filled with blood and then subsequently ejected from the ventricle to the aorta whereupon the aortic valve closes. The volume of blood ejected from the heart is the stroke volume (SV).

What happens during systole quizlet?

What happens during atrial systole? The atria contracts- the heart beat starts. Both left and right contract together. The contraction creates small increase in pressure, helps to push blood into ventricles- stretches walls of ventricles= full of blood.

What is systole in the cardiac cycle?

Systole begins when the mitral valve (or tricuspid) closes and concludes with the closure of the aortic valve (or pulmonic). This stage of the cardiac cycle represents ventricular contraction, forcing blood into the arteries.

Is systolic pressure contraction?

Systolic pressure is the maximum blood pressure during contraction of the ventricles; diastolic pressure is the minimum pressure recorded just prior to the next contraction. The blood pressure is usually written as the systolic pressure over the diastolic pressure (e.g., 120/80 mm Hg).

Is blood pressure a systole?

Blood pressure is measured using two numbers: The first number, called systolic blood pressure, measures the pressure in your arteries when your heart beats. The second number, called diastolic blood pressure, measures the pressure in your arteries when your heart rests between beats.

Is systole open or closed?

During systole, the two ventricles develop pressure and eject blood into the pulmonary artery and aorta. At this time the AV valves are closed and the semilunar valves are open. The semilunar valves are closed and the AV valves are open during diastole.

What's a systole and diastole?

Blood pressure readings are given in two numbers. The top number is the maximum pressure the heart exerts while beating (systolic pressure). The bottom number is the amount of pressure in the arteries between beats (diastolic pressure).

What is relaxation and contraction?

Relaxation of a Muscle Fiber. Ca++ ions are pumped back into the SR, which causes the tropomyosin to reshield the binding sites on the actin strands. A muscle may also stop contracting when it runs out of ATP and becomes fatigued. The release of calcium ions initiates muscle contractions.

What is systolic pressure quizlet?

Systolic Pressure. the maximum pressure against the arterial walls as the left ventricle pumps blood into the aorta (systole), indicates the strength of the left ventricular contraction.

Which is true during systole?

Which of the following is true during ventricular systole? The AV valves are closed. At the beginning of ventricular systole, the one-way AV valves are forced shut. The AV valves remain shut throughout ventricular systole.

What events occur in systole?

Systole represents the time during which the left and right ventricles contract and eject blood into the aorta and pulmonary artery, respectively. During systole, the aortic and pulmonic valves open to permit ejection into the aorta and pulmonary artery.

What occurs during the systolic phase of the heart quizlet?

As ventricular systole start, the AV valves are closed and the semilunar valves are closed. Because the ventricles are contracting and both valves are closed, pressure increases rapidly leading to ejection. As pressure builds up in the ventricles during systole, the AV valves open and allow blood to leave the heart.

Why is systole important?

Clinical trials have demonstrated that control of isolated systolic hypertension reduces total mortality, cardiovascular mortality, stroke, and HF events. Both observational studies and clinical trial data suggest that poor SBP control is largely responsible for the unacceptably low rates of overall BP control.

Why is it called systolic?

"Systolic" comes from the Greek systole meaning "a drawing together or a contraction." The term has been in use since the 16th century to denote the contraction of the heart muscle.

What phase is systolic pressure?

Systolic blood pressure is determined in phase one, and the silence of phase five marks the diastolic blood pressure. There is some debate about the fourth Korotkoff sound. Some will describe phase four as the first diastolic blood pressure and consider phase five as the second diastolic blood pressure.

What is systolic pressure simple?

Blood pressure is taken using two measurements: systolic (measured when the heart beats, when blood pressure is at its highest) and diastolic (measured between heart beats, when blood pressure is at its lowest).