The point in the conduction system of the heart where the impulse is temporarily delayed
Prevents backflow into the left ventricle.
Prevents backflow into the right atrium
Prevents backflow into the left atrium.
Prevents backflow into the right ventricle.
D) Pulmonary valves
AV valve with two flaps
AV valve with three flaps
Heart muscle is deprived of oxygen
Death of heart muscle cells.
A condition of rapid and irregular or out‐of‐phase contraction of heart muscle cells.
An abnormal pacemaker
Total heart relaxation
The myocardium receives its blood supply from the coronary arteries TORF
Cardiac muscle has more mitochondria and depends less on a continual supply of oxygen than does skeletal muscle TORF
Anastomoses among coronary arterial branches provide collateral routes for blood delivery to the heart muscle. TORF
Congestive heart failure means that the pumping efficiency of the heart is depressed so that there is inadequate delivery of blood to body tissues. TORF
Tissues damaged by myocardial infarction are replaced by connective tissue TORF
The left side of the heart pumps the same volume of blood as the right. TORF
Chronic release of excess thyroxine can cause a sustained increase in heart rate and a weakened heart. TORF
Arterial blood supply to heart muscle is continuous whether the heart is in systole or diastole TORF
Trabeculae carneae are found in the ventricles and never the atria.
The "lub" sounds of the heart are valuable in diagnosis because they provide information about the function of the heart's pulmonary and aortic valves TORF
Autonomic regulation of heart rate is via two reflex centers found in the pons. TORF
The papillary muscles contract after the other ventricular muscles so that they can take up the slack on the chordae tendineae before the full force of ventricular contractions sends blood against the AV valve flap. TORF
An ECG provides direct information about valve function.TORF
As pressure in the aorta rises due to atherosclerosis, more ventricular pressure is required to open the aortic valve TORF
Proxysmal atrial tachycardia is characterized by bursts of atrial contractions with little pause between them. TORF