Thorax [ heart ]

• The cardiac cycle refers to the sequence of events that occur during one heartbeat
• It consists of two main phases: diastole and systole
• Diastole:

  • The heart muscle relaxes and the chambers fill with blood
  • This is the resting phase of the cardiac cycle
• Systole:

  • The heart muscle contracts and pumps blood out of the chambers
  • This is the active phase of the cardiac cycle