CARDIAC CYCLE

CARDIAC CYCLE

​A sequence of alternating contraction and relaxation of the atria and ventricles in order to pump blood throughout the body.

SYSTOLE & DIASTOLE

​SYSTOLE = CONTRACTION OF HEART MUSCLES

DIASTOLE = RELAXATION OF HEART MUSCLES

ATRIAL SYSTOLE - VENTRICULAR DIASTOLE

ATRIAL SYSTOLE - VENTRICULAR DIASTOLE

1. ATRIA CONTRACTS, VENTRICLES RELAX

2. AV VALVES OPEN,

3. SEMILUNAR VALVES CLOSE

Multiple Choice

Contraction of Heart muscles is known as

• Systole

• Diastole

• Joint diastole

• none of these

Multiple Choice

Relaxation of Heart muscles is known as

• Systole

• Diastole

• Joint diastole

• none of these

PACE MAKER AND PACE SETTER

PACE MAKER AND PACE SETTER

​	S A NODE	​A V NODE
Alternate name	Pace maker	Pace Setter
​Location	​Located in the upper wall of the right atrium and the opening of the superior vena cava.	​It is located near the coronary sinus on the interatrial septum.
​Location	​The SA (sinoatrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract.	The AV node electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart

Conduction system of the hert

Conduction system

​	BUNDLE OF HIS	​PURKINJE FIBERS
​	​	​
​Location	Bundle of muscle fibers begins from AVN and extends to the inter ventricular septum	Walls of the ventricles
​Function	​The SA (sino-atrial) node generates an electrical signal that causes the upper heart chambers (atria) to contract.	The AV node electrically connects the heart's atria and ventricles to coordinate beating in the top of the heart

Multiple Choice

Which specialized tissue is found in the upper right chamber of the heart?

• A V Node

• S A Node

• Bundle of His

• Purkinje fibers

Multiple Choice

Which one of these is also known as pace setter

• A V Node

• S A Node

• Bundle of His

• Purkinje fibers

​LUBB DUP

Heart Sounds

​CLOSURE OF AV VALVES - CAUSES "LUBB" SOUND

CLOSURE OF SEMILUNAR VALVES - CAUSES "DUP" SOUND

Multiple Choice

Closure of Semi lunar valves causes _____ Sound

• LUBB

• DUP

Multiple Choice

Closure of Atrio-ventricular valves causes _____ Sound.

• LUBB

• DUP

HEART BEAT

ATRIAL SYSTOLE 0.15 SEC.

VENTRICULAR SYSTOLE 0.30 SEC.

JOINT DIASTOLE 0.40 SEC.

TOTAL TIME 0.85 SEC.

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