Which factors gives myocardium its high resistance to fatigue?
Cardiovascular
| Question | Answer |
|---|---|
| This factor gives the myocardium it’s high resistance to fatigue. | Large number of mitochondria in the cytoplasm |
| An area of the heart conduction system with the fastest depolarizing pacemaker cells. | SA node |
| Which wave in an ECG indicates atrial depolarization? | P wave |
What is the function of the myocardium in the heart?
Cardiac muscle tissue, or myocardium, is a specialized type of muscle tissue that forms the heart. This muscle tissue, which contracts and releases involuntarily, is responsible for keeping the heart pumping blood around the body.
What does the myocardium consist of?
The myocardium is the muscular layer of the heart. It consists of cardiac muscle cells (cardiac myocytes [also known as cardiac rhabdomyocytes] or cardiomyocytes) arranged in overlapping spiral patterns.
What is myocardium of the heart?
The muscles of the heart, termed the myocardium, make up the middle and thickest layer of the heart wall. This layer lies between the single-cell endocardium layer, which lines the inner chambers, and the outer epicardium, which makes up part of the pericardium that surrounds and protects the heart.
What supplies the interventricular septum?
The posterior interventricular artery, a branch of right coronary artery, supplies the posterior 1/3 of the interventricular septum. The remaining anterior 2/3 is supplied by the anterior interventricular artery which is a septal branch of the left anterior descending artery, which is a branch of left coronary artery.
What is the role of the atrioventricular node AV node )? Quizlet?
The role of the atrioventricular node (AV node) is to? Slow down impulses so that the atria can contract to fill the adjacent ventricles with blood.
How does the myocardium receive oxygen?
The heart, like any organ, requires blood for oxygen and other nutrients so it can do its work. The heart does not gather oxygen or nutrients from the blood flowing inside it. Instead, it receives blood from coronary arteries that eventually carry blood into the heart muscle.
How does the myocardium receive blood?
The coronary arteries provide the main blood supply to the heart. The coronary arteries also supply the myocardium with oxygen to allow for the contraction of the heart and thus causing circulation of the blood throughout the body.
What cell type makes up most of the myocardium?
cardiac muscle cells
Of these three layers myocardium is the thickest. this layer is composed of cardiac muscle cells. So, cardiac muscle cells make up most of the tissues of the heart.
What type of cardiac muscles make up the majority of myocardium?
Cardiac muscle (also called heart muscle or myocardium) is one of three types of vertebrate muscle tissue, with the other two being skeletal muscle and smooth muscle. It is involuntary, striated muscle that constitutes the main tissue of the wall of the heart….
| Cardiac muscle | |
|---|---|
| FMA | 14068 |
| Anatomical terminology |
What is the myocardium quizlet?
Myocardium. The thick middle layer of the wall of the heart, or consists mostly of cardiac muscle tissue that pumps blood out of the heart.
Is the interventricular septum made of myocardium?
The interventricular septum is mainly muscular, with the exception of a small membranous segment located at its superior border just beneath the right and noncoronary cusps of the aortic valve and adjacent to the septal leaflet of the tricuspid valve.
How is cardiac muscle adapted to be resistant to fatigue?
http://en.wikipedia.org/wiki/Myocardium. Cardiac muscle is adapted to be highly resistant to fatigue: it has a large number of mitochondria, enabling continuous aerobic respiration via oxidative phosphorylation, numerous myoglobins (oxygen-storing pigment) and a good blood supply, which provides nutrients and oxygen.
The cells of the myocardium behave as a single coordinated unit called a – functional syncytium. The ability of some cardiac muscle cells to initiate their own depolarization and cause depolarization of the rest of the heart is called – automaticity. Guided by powerful signaling molecules, the human heart develops from – mesoderm.
How does cardiomyopathy and CAD affect the myocardium?
The myocardium is made up of striated muscle fibers that connect at intercalated discs. Cardiomyopathy and coronary artery disease are two common conditions that affect the myocardium. Cardiomyopathy normally causes no symptoms, while CAD can cause some very noticeable changes.
What kind of disease can affect the myocardium?
Another common disease that affects the myocardium is coronary artery disease (CAD). This happens when the arteries that feed blood to the heart muscle become blocked or clogged. When oxygen cannot reach the heart muscle, death of the affected muscle occurs.
