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Introduction to anatomy
Introduction to the cardiovascular system
Introduction to the central and peripheral nervous systems
Introduction to the lymphatic system
Introduction to the muscular system
Introduction to the skeletal system
Introduction to the somatic and autonomic nervous systems
The human body consists of hundreds of muscles, which come in all different shapes and sizes. Each muscle’s particular structure allows it to perform a specific function.
The muscles are attached to bones or other tissues, to help us maintain position, perform movements and even protect some organs.
These muscles are voluntary, meaning that we have active control of them to perform movements, like flexing your elbow.
Cardiac muscle is the muscle tissue that makes up the walls of the heart. These muscles contract in a rhythmic way to pump blood to the whole body and they are involuntary meaning that we can’t consciously control this type of muscle.
Lastly, is smooth muscle, which mainly lies in the walls of blood vessels and hollow organs. In blood vessels, smooth muscle helps contract the vessel walls to alter their diameter, which helps control blood flow.
Smooth muscle is also under involuntary control. Alright, now muscles come in a variety of shapes that help serve their specific functions.
Next is a quadrate muscle, which describes a square muscle with four equal sides. An example of a quadrate muscle is the famous six pack, anatomically called the rectus abdominis, which is a long paired muscle that is divided into square-like portions by bands of connective tissue.
Humans' muscular system consists of hundreds of muscles that carry out many different functions. It is made up of skeletal muscles, which are voluntary muscles that we can control, and smooth muscles, which are involuntary muscles that we cannot control. Skeletal muscles are attached to bones by tendons, and when they contract, they pull on the bones and move the body. Smooth muscles line the walls of blood vessels and organs such as the stomach and intestines, and they contract to move substances through these vessels or organs.
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