What is the cardiac cycle?

The cardiac cycle refers to the sequence of events in the heart during one complete heartbeat, consisting of systole (contraction) and diastole (relaxation).

What are the phases of the cardiac cycle?

The phases include atrial systole, ventricular systole, isovolumetric contraction, ejection, isovolumetric relaxation, and filling.

How long does the cardiac cycle last?

The cardiac cycle lasts approximately 0.8 seconds.

What role do the valves play in the cardiac cycle?

The atrioventricular valves open to allow blood flow from the atria to the ventricles, while the semilunar valves prevent backflow into the ventricles after ejection.

What are the differences in pressure during the cardiac cycle?

Blood flows from areas of higher pressure (auricles) to areas of lower pressure (ventricles). During contraction, ventricular pressure exceeds arterial pressure, leading to blood ejection.

CICLO CARDIACO

00:08:15

https://www.youtube.com/watch?v=Fqy4jerW3Zo

摘要

TLDRThe video discusses the cardiac cycle, breaking it down into systole and diastole phases, with a focus on the heart's anatomy, including chambers and valves. It further analyzes the process of filling and contraction, including moments when various heart valves open and close, as well as the pressure dynamics in different phases. There's an emphasis on understanding concepts and reasoning through physiology rather than just memorizing details. The speaker encourages viewers to share the knowledge with others.

心得

❤️ Understanding the heart's structure is essential for learning about the cardiac cycle.
💡 The cardiac cycle includes phases: filling, atrial systole, ventricular systole, and relaxation.
⚖️ Blood flows from areas of higher pressure to lower pressure during the cycle.
🔄 Valves prevent backflow during the contraction and relaxation phases.
🩸 Ventricular filling accounts for 70% of their volume during the cycle.

时间轴

00:00:00 - 00:08:15
Manuel Arlucea introduces the video about the cardiac cycle, explaining the heart's anatomy including the right and left atria and ventricles, the tricuspid and bicuspid valves, the pulmonary artery, the aorta, and how blood enters the heart from various veins. He states the cardiac cycle consists of a systole and diastole phase, discusses the division into five parts, and emphasizes the importance of understanding the filling of the ventricles and the role of pressure differences between chambers.

思维导图

视频问答

What is the cardiac cycle?
The cardiac cycle refers to the sequence of events in the heart during one complete heartbeat, consisting of systole (contraction) and diastole (relaxation).
What are the phases of the cardiac cycle?
The phases include atrial systole, ventricular systole, isovolumetric contraction, ejection, isovolumetric relaxation, and filling.
How long does the cardiac cycle last?
The cardiac cycle lasts approximately 0.8 seconds.
What role do the valves play in the cardiac cycle?
The atrioventricular valves open to allow blood flow from the atria to the ventricles, while the semilunar valves prevent backflow into the ventricles after ejection.
What are the differences in pressure during the cardiac cycle?
Blood flows from areas of higher pressure (auricles) to areas of lower pressure (ventricles). During contraction, ventricular pressure exceeds arterial pressure, leading to blood ejection.