Cardiac Cycle - Stages of The Cardiac Cycle

Stages of The Cardiac Cycle

	AV valves*	Semilunar valves†	Status of ventricles and atria
1. early diastole	open	closed	• whole heart is relaxed • ventricles are expanding and filling
2. atrial systole	open	closed	• atria contract and pump blood • additional 10–40% filling of ventricles
3. isovolumic ventricular contraction	closed	closed	• ventricular myocytes begin to contract • ventricle volume unchanged
4. ventricular ejection	closed	open	• ventricles fully contract • pump blood to rest of body
5. Isovolumic ventricular relaxation	closed	closed	• ventricles relax • ventricle volume unchanged • atria expand and are filling

Read more about this topic: Cardiac Cycle

Famous quotes containing the words stages of, stages and/or cycle:

“America is a country that seems forever to be toddler or teenager, at those two stages of human development characterized by conflict between autonomy and security.”
—Anna Quindlen (b. 1952)

“Whoe’er has travelled life’s dull round,
Where’er his stages may have been,
May sigh to think he still has found
The warmest welcome, at an inn.”
—William Shenstone (1714–1763)

“Oh, life is a glorious cycle of song,
A medley of extemporanea;
And love is a thing that can never go wrong;
And I am Marie of Roumania.”
—Dorothy Parker (1893–1967)