Essay On Muscle

The main function of a muscle is contractility. Usually attached to bones or internal organs and blood vessels, they account for almost all movement that occurs in the body. This includes actions such as running or walking as well as more muted movements such as eye movements, posture maintenance, and joint stability. There are an estimated six hundred to eight hundred muscles located in the human body. They are vital for a myriad of operations in the body and are immensely complex in their composition. Muscles can be described by their type, components and their functions, and the process in which they contract. There are three main types of muscles: skeletal, smooth, and cardiac. The most recurrent kind of muscle is the skeletal, making

Like smooth muscles, cardiac muscles contract in a constant, rhythmic pattern. This creates and controls the constant beating of the heart at a consistent rate. They have the ability to increase or decrease this rate. Heart rate often increases after a workout or shock. High intensity workouts result in a faster rate of contraction because as the muscles work they require more and more oxygen. Blood carries oxygen to the muscles and, as a result, has the pump harder and faster to give the tiring muscles the oxygen they need. When a person is scared heart rate also increases. This is caused by sympathetic nerves, which trigger an impulse in the brain to release adrenaline from the adrenal glands located at the top of each kidney. This hormone causes the heart to pound and deliver oxygen to the body’s muscles quicker. This causes a person to be more alert and prepared for either a fight or flight response. A fight or flight response is an immediate process the nervous system undergoes when it is frightened. When this is triggered, nerve fibers are activated and hormones are released that increase muscle tension. Unlike smooth and skeletal muscles, cardiac muscles are intended to never fatigue because of the dire importance of the heart. If the heart stops functioning, asphyxiation, the deprivation of oxygen, can cause death within minutes. Like skeletal muscles, the heart can also undergo endurance training. Aerobic exercise is the preferable way to achieve this as it raises the heart rate. These exercises include activities such as jogging or biking. Similarly to smooth muscles, cardiac muscles are also involuntarily controlled by the autonomic nervous