What three functional groups make up the muscles of the lower limbs?

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Understand that muscles, including those in the lower limbs, are primarily composed of proteins, which are made up of amino acids containing specific functional groups.

Identify the key functional groups present in amino acids, which are the building blocks of muscle proteins: the amino group (-NH\_2), the carboxyl group (-COOH), and the side chain (R group) that varies among different amino acids.

Recognize that the amino group (-NH\_2) acts as a base and can accept a proton, while the carboxyl group (-COOH) acts as an acid and can donate a proton, allowing amino acids to link together via peptide bonds.

Note that peptide bonds form between the carboxyl group of one amino acid and the amino group of another, creating the protein chains that make up muscle fibers.

Conclude that the three main functional groups involved in muscle composition are the amino group, the carboxyl group, and the variable side chain (R group) of amino acids.

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Muscle Functional Groups

Muscle functional groups are sets of muscles that work together to perform specific movements or functions. In the lower limbs, these groups coordinate to enable actions like walking, running, and maintaining posture.

Anterior Muscle Group of the Lower Limb

The anterior group includes muscles located at the front of the thigh and leg, primarily responsible for extending the knee and dorsiflexing the foot. Examples include the quadriceps femoris and tibialis anterior.

Posterior and Medial Muscle Groups of the Lower Limb

The posterior group, located at the back, mainly flexes the knee and extends the hip, including muscles like the hamstrings and calf muscles. The medial group, found on the inner thigh, primarily adducts the thigh, such as the adductor muscles.