The time from the beginning of atrial depolarization to the beginning of ventrical depolarization is shown on the ECG wave form as the?
PR Interval.
What is recorded on the ECG strip?
The electrical activity of the heart.
The average heart is approximately what size?
The size of your fist.
The outer most layer of your heart is the?
Epicardium.
The middle layer of the heart is your?
Myocardium.
The inner most part of the heart is?
Endocardium.
The sac of tissue that encloses the entire heart is the?
Pericardium.
The purpose of the pericardium is to?
Protect the heart from infection and trauma.
The heart is divided into four chambers. The top chambers?
Right atrium, left atrium.
The heart is divided into four chambers. The bottom chambers are?
Right ventrical, left ventrical.
The valve located between right atrium and right ventricle is the?
Tricuspid vale.
The valve located between the left atrium and the left ventricle is the?
Mitral (bicuspid) valve.
The tricuspid and mitral (bicuspid) valves are known as _____ because they seperate the atria from the ventricles.
Atrioventricular (AV) Valves.
The _____ valves seperate the ventricles from the arteries leading to the lungs or body.
Semilunar.
Name the two semilunar valves.
Aortic and Pulmonary.
Blood returns to the heart via the veins. The largest vein is the?
Vena Cava.
Oxygenated blood travels through the heart via the?
Coronary Arteries.
The valves located in the heart are important because they?
Prevent blood from flowing backwards.
Blood that leaves the right ventricle is considered?
Deoxygenated.
What are the first vessels to branch off the aorta?
Coronary arteries.
The volume of blood pumped each minute is referred to as?
Cardiac output.
The volume of blood ejected with each contraction is referred to as?
Stroke volume.
The "lubb" & "dupp" sounds you hear are made by the?
The opening and closing of the heart.
The phase of the cardiac cycle when the heart is expanding and refilling also known as relaxation phase is?
Diastole.
The phase of the cardiac cycle when the heart is pumping blood out of the body is also known as the contraction phase is?
Systole.
Together the contraction and relaxation of the heart make up?
The cardiac cycle.
The ability of the heart muscle cells to shorten in response to an electrical impulse is?
Contractility.
The hearts own ability to initiate an electrical impulse without being stimulated by another source is known as?
Automaticity.
The ability of the heart cells to receive and transmit an electrical impulse is known as?
Conductivity.
The ability of the heart muscle cells to respond to an impulse or stimulus is known as?
Excitability.
When the sympathetic branch of the ANS (Automatic Nervous System) is stimulated. The heart responds by?
Speeding up.
What is the heart response to simulation of the vague nerve?
Slows down.
The function of the bundle branch system is to?
Conduct electrical impulse from the AV Node to the Purkinjr.
The SA Node sends electrical impulse at a rate of?
60-100 bpm.
The normal pacemaker of the heart where the electrical impulse for the heartbeat?
SA Node.
The AV Node has several important qualities that help the heart function effectively. All of these are qualities of the AV Node except?
Causes a loss of atrial kick.
Depolarization of the cells causes the heart muscle to?
Contract(ion).
The P wave represents?
Atrial Contraction.
The T wave represents?
Ventricular Relaxation.
The AV node has several important qualities that help the heart function effectively. All of these are qualities of the AV node except?
Causes a loss of atrial kick.
Depolarization of the cells causes the heart muscle to?
Contract.
The P wave represents?
Atrial contraction.
The T wave represents?
Ventricular relaxation.
The rate at which the AV node sends electrical impulses is 40-60 bpm?
True.
When the sympathetic branch of ANS is stimulated, the heart responds by?
Speeding up.
What is the hearts response to stimulation of the vagus nerve?
Slows down.
The function of the bundle branch system is to?
Conduct electrical impulses from the AV node to the Purkinje fibers.
The SA node sends electrical impulses at a rate of?
60-100 bpm.
The normal pacemaker of the heart, where the electrical impulse for the heartbeat originates, is the?
SA node.
Repolarization of the heart is also the relaxation phase of the contraction process, which allows the chambers of the heart to refill.
True.
The QRS complex represents the ventricular contraction of heart.
True.
The U wave represents repolarization of the ventricles.
False.
The ST segment is the time between the end of ventricular depolarization and the beginning of ventricular repolarization and is often assessed to determine ischemia or infarction process in the heart.
True.
A normal PR interval is 0.06-0.10 seconds in length?
False.
A normal QRS complex is 0.12-0.20?
False
The j point is important when measuring the QRS complex because it represents to the end of ventricular depolarization.
True.
The PR interval represents the time it takes the electrical current to travel from the SA node, through the AV node, to the ventricles prior to ventricular contraction.
True.
Blood travels from the body to the right side of the heart to the pulmonary circulation and then returns to the left side of the heart prior to being pumped to the coronary circulation and systemic circulation.
True.
Blood leaves the right ventricle and travels to the lungs via the pulmonary vein.
False.
Blood circulation depends on the hearts ability to contract.
True.
The process of transporting blood to and from the body tissues is known as conductivity.
False.
Blood supplies body tissues with Carbon dioxide and removes oxygen and nutrients.
False.
The function of the heart is to pump blood to and from all tissues of the body.
True.
In general, men have a faster heartbeat than women.
False.
Contraction of the heart is controlled by electrical impulses.
True.
Electrical impulses are normally initiated by the ventricles of the heart.
False.
Electrical impulses that are carried through the heart by the electrical conduction system form the basis for the ECG tracing.
True.
Cardiac contraction occurs when electrical impulses cause the working cells in the heart to shorten.
True.
The T wave represents atrial depolarization.
False.
The period of time between ventricular depolarization and the beginning of ventricular repolarization is represented on the ECG waveform by the QT interval.
False.
Correct structure located on chest.
Intercostal space.
Base of heart.
Sternum.
Diaphragm.
Heart.
Apex of heart.
Midclavicular line.
Flow of Blood
Right atrium.
Tricuspid valve.
Right ventricle.
Pulmonary valve.
Pulmonary trunk.
Pulmonary artery.
Lungs.
Pulmonary vein.
Left atrium.
Bicuspid valve.
Left ventricle.
Aortic valve.
Aorta.
Aortic arch.
Arteries.
Arterioles.
Capillaries.
Venules.
Veins.
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