Molecular clouds may collide with each other, or a nearby supernova explosion can be a trigger, sending shocked matter into the cloud at very high speeds. Alternatively, galactic collisions can trigger massive starbursts of star formation as the gas clouds in each galaxy are compressed and agitated by tidal forces.
Coordinated contractions of cardiac muscle cells in the heart propel blood out of the atria and ventricles to the blood vessels of the left/body/systemic and right/lungs/pulmonary circulatory systems.This complex mechanism illustrates systole of the heart.ardiac muscle cells, unlike most other tissues in the body, rely on an available blood and electrical supply to deliver oxygen and nutrients and remove waste products such as carbon dioxide. The coronary arteries help fulfill this function.
There is also the presence of developmental myoblasts, and these coalesce to form the important muscle fibres of the skeletal muscle. These muscle fibres contain actin and myosin. Cardiac muscles are found in the myocardium of the heart, and they can also be known as myocytes..Unlike the skeletal muscles, there are gap junctions in the cardiac muscles, and their contractions function independently from each other. 6.There are only one or two nuclei in the cardiac muscle cells, while the skeletal muscle cells are multi-nucleated.