What are the sequence of events involved in one heart beat?

Answer 1

The heart beats in two (2) stages. The Diastolic and Systolic. The Diastolic is the blood filling stage and the Systolic is the blood contracting stage. The heartbeat is initiated in the SA Node (SinoAtrial). It sends out regular waves of electrical activity to the atrial walls. This causes the right and left atria to contract at the same time. The electrical activity cannot pass to the ventricles because there is a layer of collagen tissue. Instead the electrical activity gets passed to the AV Node (AtrioVentricular) The AV Node is responsible for passing the waves of electrical activity on to the Bundle Of His. Although there is a slight delay to make sure the ventricle's contraction occurs after the Atria has emptied. (The bundle of His is a group of muscle fibres which conduct the electrical activity to muscle fibres in the right and left ventricle walls Purkyne Fibres.) The Purkyne fibres carry the waves of electrical activity to the walls of the right and left ventricles , causing them to contract at the same time from the bottom of the muscle up.

Answer 2

Blood enters the Atria.

The Atria contracts.

Valves between the Atria and Ventricles open.

Blood moves into the Ventricles.

Valves between the Atria and Ventricles close.

The Ventricles contract.

Valves leading out of the Ventricles open.

Blood leaves the heart.

The heart muscle relaxes.

Hope that helps ^^ x

Answer 3

The rhythm of the heart is the pattern in which it beats. We're used to hearing lub DUB lub DUB. Another rhythm sounds more like ken TUCK y ken TUCK y. Some rhythms are irregular, like lub DUB lub DUB LUB DUB.

Answer 4

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Answer 5

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