Help
Options
Didn't know it?
click below
click below
Knew it?
click below
click below
Don't Know
Remaining cards (0)
Know
retry
shuffle
restart
0:00
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
the heart
the heart structure
| Question | Answer |
|---|---|
| parietal pericardium | the paricardial sac, it is the pouch around the heart |
| visceral pericardium | also known as the epicardium, it is the outer surface or the heart. |
| epicardium | the epithelial and connective tissue layer on the outside surface of the heart. |
| myocardium | the very thick heart muscle layer. |
| endocardium | the inner lining of the heart, the membrane that comes into contact with blood and lines all the valves and chambers. |
| Atria | the receiving chambers of the heart, the top chambers of the heart. |
| auricles | an extension of the atria, resemble ears. |
| ventricles | the strong thick walled pumps of the heart, located at the bottom of the heart. |
| atrioventricular valves (AV) | valves between the atria and the ventricles including the tricuspid and the mitral valves |
| tricuspid | the 3 cusped valve on the right side of the heart between the atria and ventricle |
| mitral valve | two cusped valve on the left side of the heart between the left ventricle and the left atria |
| chordae tendonae | tough tissue connected to the cusps of valves |
| papillary muscles | projections from the ventricle walls where the chordae tendonae are anchored |
| semilunar valves | valves found at the entrances of arteries that receive blood from the ventricles |
| pulmonary valve | valve found at the entrance of the pulmonary trunk |
| aortic valve | valve found at the entrance of the aorta |
| superior vena cava | part of systemic circulation that carries blood from above the heart to the right atria |
| inferior vena cava | part of systemic circulation that carries blood from the body below the heart into the right atria |
| coronary sinus | attached to the back surface of the heart it is the last vein in coronary circulation. it delivers deoxygenated blood the the right artrium |
| pulmonary veins | veins coming from the lungs that carry oxygenated blood to the left atria |
| pulmonary trunk | artery that receives deoxygenated blood directly from the right ventricle and branches into the pulmonary arteries |
| aorta | the 1st and largest artery in coronary circulation and systemic circulation. |
| SinoAtrial node | the "pacemaker" of the heart. it is the first part of the heart to reach threshold. |
| pacemaker cells | self stimulating cells. they have sodium channels that are always open allowing sodium to diffuse across the membrane. |
| Atrioventricular node | can be the pacemaker if the SA node isnt functioning. it cause a pause in the electrical impulse allowing atria to finish contracting before sending the impulse the ventricles |
| bundel of his | carries electrical signal from av nnode to the septum into the bundle branches |
| bundle branches> perkinje fiber | carry signal down the septum and up the side walls of the ventricles. the perkinje fibers stimulate the muscle cells |
| Systole | contraction or when a chamber is pumping |
| diastole | when a chamber is filling |
| Lubb and dupp | lupp is the first heart sound (av valves closing) dupp is the 2nd heart sound when the semilunar valves are closing |
| parasympathetic control of HR | the vagus nerves sends impulses that close sodium channles a little bit to slow HR. the entire conduction system slows but SA and AV nodes are effected most. |
| Sympathetic control of HR | the cardiac accelerator nerve sends impulses that open sodium channels to speed up heart rate. |
Created by:
688472874
Popular Physiology sets