Robina Blessing
Oct 16
Describe the cardiac cycle with a labeled diagram.
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Oct 16
The cardiac cycle is the sequence of events that occur during one heartbeat. It consists of two main phases: diastole and systole.
During diastole, the heart is relaxed and filling with blood. The atria contract, pushing blood into the ventricles. This is known as atrial systole. The ventricles then fill with blood from the atria, known as ventricular diastole.
During systole, the ventricles contract, pushing blood out of the heart. The atria relax and fill with blood. This is known as ventricular systole. The cycle then repeats with another round of diastole and systole.
Here is a labeled diagram of the cardiac cycle:
1. Atrial systole
2. Ventricular diastole
3. Ventricular systole
4. Atrial diastole
This diagram shows the sequence of events during one complete cardiac cycle.
During diastole, the heart is relaxed and filling with blood. The atria contract, pushing blood into the ventricles. This is known as atrial systole. The ventricles then fill with blood from the atria, known as ventricular diastole.
During systole, the ventricles contract, pushing blood out of the heart. The atria relax and fill with blood. This is known as ventricular systole. The cycle then repeats with another round of diastole and systole.
Here is a labeled diagram of the cardiac cycle:
1. Atrial systole
2. Ventricular diastole
3. Ventricular systole
4. Atrial diastole
This diagram shows the sequence of events during one complete cardiac cycle.
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Google Gemini AI
Oct 16
Cardiac Cycle
The cardiac cycle refers to the sequence of events that occur during one complete heartbeat, including the contraction and relaxation of the heart's chambers.
Diagram:
[Image of labeled cardiac cycle diagram]
Events of the Cardiac Cycle:
1. Diastole (Filling Phase):
- The heart relaxes, and the atrioventricular (AV) valves (tricuspid and mitral) open.
- Blood flows from the atria (upper chambers) into the ventricles (lower chambers).
2. Atrial Systole (Atrial Contraction):
- The atria contract, pushing more blood into the ventricles.
- The AV valves remain open.
3. Isovolumic Ventricular Contraction:
- The ventricles contract, but the AV valves remain closed and the aortic and pulmonary semilunar valves are still closed.
- The pressure in the ventricles rises.
4. Ventricular Ejection:
- The pressure in the ventricles exceeds that in the aorta and pulmonary artery.
- The semilunar valves (aortic and pulmonary) open, and blood is ejected from the heart into these arteries.
5. Isovolumic Ventricular Relaxation:
- The ventricles relax, but the semilunar valves remain open and the AV valves are still closed.
- The pressure in the ventricles falls.
6. Rapid Inflow Period:
- The pressure in the atria is higher than in the ventricles, and the AV valves open.
- Blood rapidly flows from the atria into the ventricles.
7. Diastasis:
- The pressure in the atria and ventricles equalize, and the AV valves remain open.
- Blood continues to flow from the atria to the ventricles, but at a slower rate.
Key Structures:
- Atria (right and left)
- Ventricles (right and left)
- AV valves (tricuspid and mitral)
- Semilunar valves (aortic and pulmonary)
The cardiac cycle refers to the sequence of events that occur during one complete heartbeat, including the contraction and relaxation of the heart's chambers.
Diagram:
[Image of labeled cardiac cycle diagram]
Events of the Cardiac Cycle:
1. Diastole (Filling Phase):
- The heart relaxes, and the atrioventricular (AV) valves (tricuspid and mitral) open.
- Blood flows from the atria (upper chambers) into the ventricles (lower chambers).
2. Atrial Systole (Atrial Contraction):
- The atria contract, pushing more blood into the ventricles.
- The AV valves remain open.
3. Isovolumic Ventricular Contraction:
- The ventricles contract, but the AV valves remain closed and the aortic and pulmonary semilunar valves are still closed.
- The pressure in the ventricles rises.
4. Ventricular Ejection:
- The pressure in the ventricles exceeds that in the aorta and pulmonary artery.
- The semilunar valves (aortic and pulmonary) open, and blood is ejected from the heart into these arteries.
5. Isovolumic Ventricular Relaxation:
- The ventricles relax, but the semilunar valves remain open and the AV valves are still closed.
- The pressure in the ventricles falls.
6. Rapid Inflow Period:
- The pressure in the atria is higher than in the ventricles, and the AV valves open.
- Blood rapidly flows from the atria into the ventricles.
7. Diastasis:
- The pressure in the atria and ventricles equalize, and the AV valves remain open.
- Blood continues to flow from the atria to the ventricles, but at a slower rate.
Key Structures:
- Atria (right and left)
- Ventricles (right and left)
- AV valves (tricuspid and mitral)
- Semilunar valves (aortic and pulmonary)
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