Definitions

1. noun

The contraction of the heart muscle during a heartbeat, when the heart chambers contract to pump blood.

“The cardiologist listened to the patient’s heartbeat, paying close attention to the systole and diastole phases.”

2. noun

In embryology, the first half of the heartbeat, during which the heart muscle contracts and blood is pumped into the circulation.

“During embryonic development, the heart undergoes several stages, including the systole phase, where it starts pumping blood.”

3. noun

The upward movement of the diaphragm in breathing, or the inspiration of air into the lungs.

“The diaphragm’s systole phase allows air to enter the lungs during inhalation.”