Human Muscle and its anatomy, Charts and diagram
Hey freaks, Today we are back with another important topic where we will learn everything about human muscle anatomy. So be with us and lets get started.
The human body is made up of many different types of tissues, including muscle tissue. Muscle tissue is responsible for movement, posture, and the ability to generate force. There are three types of muscle tissue in the human body: skeletal, smooth, and cardiac.
Skeletal muscle is the most abundant type of muscle tissue in the body, making up about 40% of total body weight. Skeletal muscle is attached to bones by tendons, and it is responsible for voluntary movement, such as walking and moving the arms and legs. Skeletal muscles are made up of long, cylindrical cells called muscle fibers. These fibers are composed of many smaller units called myofibrils, which contain the proteins actin and myosin. These proteins are responsible for the contraction and relaxation of the muscle fibers.
Smooth muscle is found in the walls of internal organs, such as the stomach and intestines. Unlike skeletal muscle, smooth muscle is involuntary, meaning that it is not under conscious control. Smooth muscle is responsible for the rhythmic contractions that move food through the digestive system and the contractions of blood vessels that regulate blood flow. Smooth muscle fibers are spindle-shaped and are not organized into the same type of bundles as skeletal muscle fibers.
Cardiac muscle is found in the heart and is responsible for pumping blood throughout the body. Cardiac muscle is involuntary and has a unique ability to contract rhythmically without fatigue. Cardiac muscle fibers are shorter and thicker than skeletal muscle fibers, and they contain many branches that connect to neighboring cells. The branches allow the muscle fibers to contract in a coordinated manner, which is necessary for the efficient pumping of blood.
Muscles are controlled by the nervous system, through the release of chemicals called neurotransmitters. When a nerve impulse reaches a muscle fiber, it triggers the release of a neurotransmitter called acetylcholine. Acetylcholine binds to receptors on the muscle fiber, causing the muscle to contract. After the contraction, an enzyme called acetylcholinesterase breaks down the acetylcholine, stopping the contraction.
Muscles also need a good blood supply to bring oxygen and nutrients to the muscle fibers and remove waste products. The blood vessels that supply muscles are called the arterioles and venules. Arterioles are the small branches of the arteries that bring oxygen-rich blood to the muscles, and venules are the small branches of the veins that take away carbon-dioxide rich blood from the muscles.
Muscles can also be classified based on their function, as agonist, antagonist or synergist. Agonist muscles are the muscles that are primarily responsible for a particular movement, such as the biceps brachii during a bicep curl. Antagonist muscles work in opposition to the agonist muscles and help to control and slow down a movement, such as the triceps brachii during a bicep curl. Synergist muscles assist the agonist muscles by stabilizing a joint, such as the rotator cuff during a bicep curl.
Muscles also adapt to the demands placed on them through a process called muscle hypertrophy. This occurs when muscle fibers increase in size due to an increase in the number of myofibrils. This can happen as a result of resistance training, such as weightlifting, or endurance training, such as running or cycling.
In conclusion, the human body is made up of three types of muscle tissue: skeletal, smooth, and cardiac. Skeletal muscle is responsible for voluntary movement, smooth muscle is responsible for involuntary movement in internal organs, and cardiac muscle is responsible for pumping blood throughout the body. The nervous system controls the contraction and relaxation of muscle fibers through
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