continuous one way circuit of blood through the blood vessels
the membrane that lines the cavities of the heart and forms part of the heart valves, inner layer of the heart wall consisting of epithelium and connective tissue as well as some specialized muscle tissue
the middle muscular layer of the heart wall - the thickest and pumps blood through the vessels
(thin outer layer) serous (watery) membrane attaches to the pericardium
protective sac enclosing the heart composed of two layers with fluid between
Functions of the Myocardium
-have a singular nucleus
-branching of muscle fibers
these fibers are interwoven so that stimulation that causes the contraction of one fiber results in the contraction of a whole group. The intercalated disks and the branching cellular networks allow for the cardic muscles to contract in a coordinated manner
system of blood vessels that carries blood between the heart and the lungs
Circuit of blood that carries blood between the heart and the rest of the body.
the two upper chambers of the heart. There is a right atrium (which receives unoxygenated blood returning from the body) and a left atrium (which receives oxygenated blood returning from the lungs).
the two lower chambers of the heart, and they pump blood out to the lungs and body.
receives oxygen-poor blood from all tissues, except the lungs, through the superior and inferior venae cavae
the chamber on the right side of the heart that receives venous blood from the right atrium and pumps it into the pulmonary trunk
the left upper chamber of the heart that receives blood from the pulmonary veins
the chamber on the left side of the heart that receives arterial blood from the left atrium and pumps it into the aorta
a wall of tissue that separates the left and right sides of the heart
Pertaining to between the atria., seperates the right and left atrium
pertaining to between ventricles, septum
Right AV valve
Tricuspid valve - prevents blood from flowing back up into the right atrium when the right ventricle contracts - SYSTOLE
Left AV valve
bicuspid or mitral valve - prevents blood from flowing back upinto the left atrium when the left ventricle contracts - SYSTOLE
Pulmonary semi-lunar valve
valve with 3 half moon shaped cusps - prevents blood from flowing back into the right ventricle when the right ventricle relaxes - DIASTOLE
Aortic semilunar valve
valve with 3 half moon shaped cusps - prevents blood from flowing back into the left ventricle when the left ventricle relaxes - DIASTOLE
the contraction of the chambers of the heart (especially the ventricles) to drive blood into the aorta and pulmonary artery
the widening of the chambers of the heart between two contractions when the chambers fill with blood, The stage of the heart cycle in which the heart muscle is relaxed, allowing the chambers to fill with blood.
atrial systole/ventricular diastole, ventricular systole/atrial diastole, brief complete diastole
the amount of blood pumped out by the ventricles in a given period of time, Stroke Volume X Heart Rate
the volume of blood pumped out by a ventricle with each heartbeat
number of beats per minute
a specialized bit of heart tissue that controls the heartbeat, the heart's pacemaker, located in the wall of the right atrium
neurological tissue in the center of the heart that receives and amplifies the conduction of impulses from the SA node to the bundle of His
fibers in the ventricles that transmit impulses to the right and left ventricles, causing them to contract
consists of anterior, middle, and posterior divisions that distribute electrical impulse generated by the sa node throughout the right and left atria to the artioventriuclar node
A heart rhythm initiated by the SA node; a normal rhythm.
abnormally slow heartbeat
abnormally rapid heartbeat (over 100 beats per minute)
change in heart rhythm due to respiration
originates in an irritable automaticity focus that fires spontaneously, producing a beat earlier than expected in the rhythm
an abnormal sound of the heart
Bundle of his
a bundle of modified heart muscle that transmits the cardiac impulse from the atrioventricular node to the ventricles causing them to contract
the ability to respond to demands (exercise, stress, hypovolemia) by altering cardiac output threefold or fourfold.
Bundle of His
Parietal - Pericardium Cavity - Visceral Pericardium
supplies blood to the muscles of the heart to meet the high oxygen and nutrient demands of the cardiac muscle cells - blood vessels that supply the heart
the vessel that drains blood from the heart muscle tissues into the right atrium
is an average time of a cardiac cycle
a medical instrument for listening to the sounds generated inside the body
process of recording the electrical activity of the heart
a noninvasive diagnostic procedure that uses ultrasound to study to structure and motions of the heart
n this test a long, thin tube is inserted into the patient's body to inject a special dye, which can show narrowed areas in arteries due to plaque buildup and find other problems.
sound is caused by the closure of the atrioventicular valves
sound is caused by the closure of the semilunar valves