Using simple terms, explain how the contraction of the atria and ventricles is controlled by the cardiac conduction system.

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Lelia LubowitzLv2

28 Sep 2019

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Match the following terms describing the physical/mecahnical events with the correct phases of the cardiac cycle. Each phase may be used more than once.

- A. B. C. D.	All 4 cardiac valves are closed and all 4 chambers are relaxed during this phase.
- A. B. C. D.	The maximum amount of blood is in the ventricles at the end of this phase.
- A. B. C. D.	The pressure in the ventricles is higher than in the atria, but lower than in the arteries, during this phase.
- A. B. C. D.	The semilunar valves are open and the AV valves are closed during this phase.
- A. B. C. D.	The atria contract at the end of this phase.
- A. B. C. D.	The pressure in the ventricles is higher than the pressure in both the atria and the arteries during this phase.
- A. B. C. D.	Systole begins with this phase.

A.	isovolumetric relaxation
B.	ventricular ejection
C.	isovolumetric contraction
D.	ventricular filling

The electrical depolarization which spreads through the heartmusculature and precedes contraction of atria and ventricles isdependent upon the rapid inward diffusion of which of the followingions? sodium, calcium, nitrate, chloride, potassium