(Introduction to Muscular System) Without muscle, Humans could not live. The primary job of muscles is to move the bones of the skeleton, but muscles also enable the heart to beat and constitute the walls of other important hollow organs.

There are three types of muscle tissue:

Skeletal muscle: This type of muscle creates movement in the body. There are more than 600 skeletal muscles, and they make up about 40% of a person's body weight when the nervous system signals the muscle to contract. Groups of muscles work together to move the skeleton. These signals and movements are nearly involuntary.

Yet they do require conscious effort. However, humans do not need to concentrate on individual muscles when moving. Skeletal muscle tissue is made up of a collection of muscle fibers wrapped in connective tissue sheaths. There are three types of connective tissue sheaths named for their location, and dome ism surrounds individual muscle fibers. It is made up of a delicate layer of reticular fibers and permits only small-diameter nerve fibers and capillaries, thus acting as a site of metabolic exchange.

Paramecium is a slightly thicker layer of connective tissue consisting mainly of tai pi and eye collagen and surrounds a group of fibers. This fiber group is referred to as a physical or bundle physical or the functional units of skeletal muscle tissue. The Paramecium contains slightly larger blood vessels and nerve fibers than those traveling through and dome ism. FMC surrounds the entire collection of physicals making up an individual muscle.

This dense connective tissue made up of mainly Type II collagen contains the neurovascular supply to the muscle. Cardiac muscle. The cardiac muscle is an involuntary muscle. This type makes up the walls of the heart and creates the steady, rhythmic, pulsing that pumps blood through the body from signals from the brain. This muscle type also creates the electrical impulses that produce the heart's contractions, but hormones and stimuli from the nervous system can also affect these impulses, such as when your heart rate increases when you're scared.

It is capable of strong, continuous, and rhythmic contraction ins that are automatically generated. The contractility can be altered by the autonomic nervous system and hormones. In addition, this tissue type has high metabolic energy and vascular demands. Cardiac muscle fibers are long branch cells shaped like cylinders, joined in to end with one or two nuclei located centrally. The fibers are separated by cholangitis tissue that supports the capillary network of cardiac tissue.

The MYO filaments of cardiac muscle are arranged in a similar pattern to the skeletal muscle resulting in cross striations. The fibers are crossed by linear bands called interconnect disks. These structures have two important roles. Firstly, they provide attachment points that provide the tissue with a characteristic branched pattern. Secondly, they allow cardiac muscle tissue to function as a functional sensorium.

Essentially, the contractile stimuli are propagated from one cell to the next one, resulting in a synchronous contraction of the entire tissue section. Smooth muscle. Smooth muscle makes up the walls of hollow organs, respiratory passageways, and blood vessels. Its wave-like movements propel things through the bodily system, such as food through your stomach or urine through your bladder like a cardiac muscle.

Smooth muscle is involuntary and also contracts in response to stimuli and nerve impulses. Muscle movement happens when neurological signals produce electrical changes in muscle cells During this process, calcium is released into the cells and brings about a short muscle twitch. Problems with the junction between the cells called a synapse can lead to neuromuscular diseases. That's it for today.

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