More than 650 individual muscles make up the human body, and tendons connect them to the skeleton. All muscles serve the primary purpose of enabling movement throughout the body. The strong framework comprises of three distinct kinds of muscle tissues: smooth, skeletal, and cardiac The ability to contract each of these distinct tissues makes it possible for the body to move and perform its functions. The system is made up of two types of muscles: voluntary muscles and involuntary muscles. Involuntary muscles are those whose function cannot be consciously controlled, whereas voluntary muscles are those that work under our control. The heart, or the cardiovascular muscle, is an illustration of a compulsory muscle.

MUSCLES OF THESKELET:
About 40% of an adult's body weight is made up of skeletal muscles. Striations, or markings, resemble stripes. Long muscle fibers make up the skeletal muscles. The muscle's contraction is controlled by the nervous system. Large numbers of the skeletal muscle constrictions are programmed. However, we can still control how the skeletal muscle moves. The skeletal muscle is also known as the voluntary muscle for this reason.

THIN MUSCLES:
A large portion of our inward organs are comprised of smooth muscles. They are found in the arteries, veins, gallbladder, and urinary bladder. Smooth muscle also makes up the digestive system. Hormones and the autonomic nervous system control the smooth muscles. The smooth muscles are frequently referred to as involuntary muscles because we have no conscious control over them.

MUSCLE OF THE BRAIN:
A type of involuntary striated muscle only found in the heart is the cardiac muscle. Its capability is to "siphon" blood through the circulatory framework by contracting. The function of cardiac muscle is based on self-excitable stimulating contraction without an electrical impulse from the central nervous system, in contrast to skeletal muscle, which contracts in response to nerve stimulation.

Movement is typically produced by muscles working in pairs: Antagonism occurs when one muscle flexes (or contracts), while the other relaxes.

An extensor muscle is any skeletal muscle that opens a joint expanding the point between parts of an appendage, for example, fixing the knee or elbow and bowing the wrist or spine. The movement is backward, with the exception of the knee joint. Extension is the term for this action.

A flexor muscle is a skeletal muscle whose contraction reduces the angle between limb components when bending a joint, such as the elbow or knee. This activity is known as flexion.

Any muscle that moves an extremity (limb) away from the midline of the body or from a neighboring part or limb is known as an abductor muscle.

Any muscle that moves an area of the body toward its median line or the axis of an extremity is known as an adductor muscle.