Heart valve, conduction and sounds Words 1

contraction

relaxation

process of recording electrical activity generated by the heart

• record of electrical activity generated by the heart
• used to evaluate abnormal cardiac rhythm

• normal heart rhythm
• shows 5 waves on the ECG strip, which represent electrical changes as they spread through the heart

represents atrial depolarization, conduction of an electrical impulse through the atria causing atrial contraction

ventricular depolarization, conduction of electrical impulses through the ventricle though the bundle of His and Purkinje fibers causing ventricular contraction

electrical recovery and relaxation of the ventricles (during diastole)

abnormal smallness of the heart (underdeveloped)

enlargement of the heart

paroxysmal pain in the chest, often radiating to the arms, particularly the left, usually due to interference with the supply of oxygen to the heart muscle

the inner open space or cavity of a tubular organ, as of a blood vessel.

• abnormal condition of arterial hardening
• thickening, hardening, and loss of elasticity of the atrial walls which results in decreased blood supply

• abnormal condition of fatty plaque hardening
• most common form or arteriosclerosis