A. Sinoatria(SA) node (pacemaker).
B. Antrioventricular (AV) node
C.antrioventicular (AV) bundle
D. Bundle branches
E. Subendocardial conducting network
A. Right atrium
B. Tricuspid valve
C. Left pulmonary veins
D. Mitral (bicuspid) valve
E. Left ventricle
endothelial membrane that lines the interior of the heart
Define parietal layer(of serious pericardium)
lines the internal surface of the fibrous pericardium. Attaches to the large arteries exiting the heart
layer of the heart wall composed of cardiac muscle
the visceral layer of the serous pericardium
a heart rate below 60 bpm
the difference between resting and maximal cardiac output
a heart rate over 100 bmp
internal biological process referring to the activity of the vagus nerve, under resting conditions, both autonomic divisions continuously send impulses to the SA node, but the dominant influence is inhibitory
Which blood vessels supply the myocardium with blood?
Coronary Arteries (veins?)
Which ATP producing organelle is abundant in cardiac muscle cells? Is it more or less reliant on oxygen as a result?
mitochondria, more reliant
A union of joining of nerves, blood vessels, or lymphatics
What is congestive heart failure (CHF)?
condition in which the pumping efficiency of the heart is depressed so that circulation is inadequate to meet tissue needs
What tissue replaces cardiac tissue that has been injured by a myocardial infarct?
non contractile scar tissue
Do the left and right ventricles pump the same amount of blood or different amounts?
What are auricles in relation to the heart and what is their purpose?
small, wrinkled, protruding appendages that increase the atrial volume somewhat
what region of the brainstem are the autonomic regulatory centers for the heart rate located?
Adrenal medulla (medulla oblongata, ventrolateral medulla?)
What would happen to blood circulation if the aorta and pulmonary trunk were switched around in terms of which ventricle the opened up into?
The right ventricle pumps blood into the pulmonary trunk, which routes the blood to the lungs where gas exchange occurs. The left ventricle ejects blood into the aorta. So if they got switched, blood could not circulate properly because the pulmonary trunk is much smaller and is not able to withstand as much stress
What causes normal heart sounds?
heart valves closing. First round closing is AV valves, second sound closing is SL valves