Circulatory System: Electrical Conductivity flash cards

Set: Circulatory System: Electrical Conductivity

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	Term	Definition
	SA (sinoatrial) node	Pacemaker. Located in the right atrium (group of cells that recieve impulse from brain impulse). It sends out elctrical impulse. Impulse spreads over atria, making them contract. Travels to AV node.
	AV (atrioventricular) node	Conducting cell group between atria and ventricle. Carries impulse to bundle of His.
	bundle of his	Conducting fibers in septum. Divides into right and left branches to network of branches in ventricles (Perkinje fibers).
	Purkinje fibers	Impulse shoots along these, causing ventricles to contract.
	electrocardiogram (ECG or EKG)	Device used to record the electrical activity of the heart.
	systole	Contraction phase of the heart.
	diastole	Relaxation phase of the heart.
	EKG base line	Flat line.
	EKG P	Atrial contraction.
	EKG QRS	Ventricular contraction.
	EKG T	Ventricular relaxation.
	Holter Moniter	24 hour EKG
	blood pressure	Surge of blood when heart pumps. Creates pressure against the walls of the arteries.
	systolic pressure	BP measured during the contraction phase. Avg. 120.
	diastolic pressure	BP Measured when the ventricles are relaxed. Avg. 80.
	sphygmomanometer	Device used to measure, in mm/Hg, blood pressure.
	pulse	Alternating expansion and contraction of an artery as blood flows through it.
	pulse sites	Carotid, brachial, radial, popliteal, pedal.
	apical pulse	The audible heartbeat heard when using a stethoscope.
	stethoscope	Diagnositic tool used to hear sounds inside the body.

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