Muscular System

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by frankieruffino
Last updated 4 years ago

Human Anatomy

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Muscular System

Muscular System

Skeletal muscles are muscles attached to bone. They appear striated and are under volantary control.

Cardiac muscles are located in the walls of the heart. They appear striated and are under involantary control.

Smooth muscles are located inside all hollow muscle organs except for the heart. They appear spindle shaped and are under involantary control

Muscle contractions are when muscle fibers generate tension. The fibers are made up of myofibrils. While contraction makes it sound like it would be getting smaller, the muscle can actually grow longer, smaller, or stay the same. Acetylcholine is a substance that will make muscles contract and cholinesterase will return the muscle back to normal.

Flexors and extensors normally go hand in hand. A flexor muscle is any muscle that decreases the angle from bone to bone, like bending an elbow or knee. An extensor muscle is any muscle that increases the angle from bone to bone. For example, bending your wrist or spine backwards.

Fatigue is a common feeling after excercise. It is caused by substrate shortage. When muscles dont have energy left to move, they stop contracting.

Tendons, muscles, and bones all work together well. The relationship is that a tendon attaches muscle to bone. The study of a structure like this is called myology.

The all or none term is that when the brain sends a signal to the muscle fiber it contracts fully or not at all. There is no inbetween. But we can partially bend our arms because it is specific fibers that are contracting.

Quadriceps are muscles located on the front of your thigh. Calves are located on the back side of the shin. Latissimus dorsi are the muscles found on your back. Abdominal muscles start on the front of your body under your ribs and end at your pelvis. Pectoralis minor and major are both located on your chest. Biceps and triceps start at your shoulder and end at your elbow, but are on opposite sides of the arm. Trapezius muscles are on top of your shoulder blade and collar bone.


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