Explain the cardiac cycle of the heart.
Understand the Problem
The question is asking to explain the cardiac cycle of the heart, which involves detailing the sequence of events that occur during one complete heartbeat, including the phases of contraction and relaxation of the heart muscles.
Answer
The cardiac cycle involves atrial and ventricular systole and diastole to pump blood, coordinated by electrical signals.
The cardiac cycle is a sequence of events in the heart from one heartbeat to the next, involving systole (contraction) and diastole (relaxation) of the atria and ventricles to pump blood. It includes electrical signals that prompt heart muscles to contract, lasting around 0.8 seconds.
Answer for screen readers
The cardiac cycle is a sequence of events in the heart from one heartbeat to the next, involving systole (contraction) and diastole (relaxation) of the atria and ventricles to pump blood. It includes electrical signals that prompt heart muscles to contract, lasting around 0.8 seconds.
More Information
Each cardiac cycle starts with electrical signals that cause the atria to contract, pushing blood into the ventricles. Following atrial diastole, ventricular systole occurs, pumping blood to the lungs and body. The cycle repeats with ventricular diastole.
Tips
A common mistake is confusing systole and diastole phases. Remember, systole is contraction, and diastole is relaxation.
Sources
- Physiology, Cardiac Cycle - StatPearls - NCBI Bookshelf - ncbi.nlm.nih.gov
- 19.3 Cardiac Cycle – Anatomy & Physiology - Oregon State University - open.oregonstate.education
- Cardiac Cycle - an overview | ScienceDirect Topics - sciencedirect.com
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