cardiac muscle的意思|示意

Cardiac muscle, also known as heart muscle, is a type of involuntary muscle found in the walls of the heart. It helps to pump blood throughout the body by contracting and relaxing in a rhythm known as the cardiac cycle.

Cardiac muscle cells are generally shorter than other types of muscle cells and have multiple nuclei. They contain more mitochondria and myoglobin than other muscles, giving them a distinct red color. Cardiac muscle normally does not complete the full contraction-relaxation cycle like skeletal muscle does, but rather just relaxes after contracting.

Cardiac muscle tissue is mostly found in the walls of the chambers of the heart. When it contracts, it creates pressure to help pump blood through the circulatory system. Contraction and relaxation of the cardiac muscle is controlled by electrical impulses from the sinoatrial node, or SA node, which is located in the right atrium of the heart.

Cardiac muscle is essential for providing oxygenated blood to the body and valvular closure, which is the process of the heart’s valves opening and closing during the cardiac cycle. When the heart contracts, it creates pressure, forcing blood to flow through the chambers and out of the heart. Valvular closure then helps to regulate the direction that the blood flows.

Cardiac muscle plays an important role in keeping the body healthy, and any injury or illness to the heart can be life-threatening. Any disease or disorder of the cardiac muscle can lead to arrhythmias, which are irregularities in the heart’s rhythm that can potentially lead to heart failure.