Physiology, Cardiac Muscle - StatPearls - NCBI Bookshelf
2023年7月30日 · These electrical rhythms cause depolarization of the heart, which, in turn, leads to the contraction of the myocardium. With this knowledge, one can understand that the EKG indirectly indicates the heart's contraction.
Myocardial Contractility: Historical and Contemporary ...
2020年3月31日 · Myocardial contraction is mechanically manifested as the force and velocity generated during sarcomere shortening. It occurs when Ca +2 binds to troponin-C and reconfigures tropomyosin so that myosin heads fueled by the energy produced from ATP hydrolysis produce effective XB cycling.
Myocardial contractility - Wikipedia
Myocardial contractility represents the innate ability of the heart muscle (cardiac muscle or myocardium) to contract. It is the maximum attainable value for the force of contraction of a given heart.
17.3A: Mechanism and Contraction Events of Cardiac Muscle ...
The actual mechanical contraction response in cardiac muscle occurs via the sliding filament model of contraction. In the sliding filament model, myosin filaments slide along actin filaments to shorten or lengthen the muscle fiber for contraction and relaxation.
Myocardium: definition, structure and function | Kenhub
2023年10月30日 · The main function of the myocardium is to facilitate the contraction and relaxation of the heart walls in order to receive and pump the blood into the systemic circulation. In addition, the myocardial cells provide a scaffold …
19.2 Cardiac Muscle and Electrical Activity - OpenStax
There are two major types of cardiac muscle cells: myocardial contractile cells and myocardial conducting cells. The myocardial contractile cells constitute the bulk (99 percent) of the cells in the atria and ventricles.
Anatomy, Thorax, Heart Muscles - StatPearls - NCBI Bookshelf
2024年6月22日 · The myocardium is responsible for the contractile function of the cardiac pump. Composed of cardiomyocytes, the heart muscle has distinctive cellular and physiological features, allowing it to generate force to maintain adequate tissue and organ perfusion throughout the body.