The Cardiac Cycle Is Vital For Proper Cardiovascular System Function

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Task 1b
The Cardiac Cycle
The cardiac cycle is vital for proper cardiovascular system function. The cardiovascular system transports nutrients and waste to and from the cells of the body – the heart (and subsequently the cardiac cycle) provides the power to this system.
The cardiac cycle is the sequence of steps that are carried out when the heart beats. There are two main phases of the cardiac cycle; the diastolic phase and the systole phase. The diastole phase causes the heart to fill with blood and the systole phase moves the blood from the heart to the arteries. One cardiac cycle is completed when the heart fills with blood and then is pumped back out of the heart. The two main phases can be broken down into four steps.

Key Definitions
Atria: The heart is divided into four chambers that are connected by heart valves, the upper two heart chambers are called atria.
Ventricles: The heart is divided into four chambers that are connected by heart valves, the lower two chambers of the heart are called ventricles.
Atrioventricular valves: a valve between an atrium and ventricle of the heart.
Vena cava: the two largest veins in the body, carry de-oxygenated blood from various regions of the body to the right atrium of the heart.
SA node: The sinoatrial node is a section of nodal tissue located in the upper wall of the right atrium. Sets the rate of contraction for the heart. Spontaneously contracts and generates nerve impulses that travel throughout the heart wall causing both
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