PLTW HBS Make up of a Muscle

What are the 3 types of muscle?

smooth, cardiac, and skeletal muscle

Skeletal muscle

Striated, multinucleated, voluntary muscle attached to bones, surrounded and bundled by connective tissue.

Smooth muscle

Involuntary, non-striated muscle found inside many internal organs of the body

Cardiac muscle

Involuntary, non-striated muscle tissue found only in the heart. Has intercalated discs.

Voluntary

muscles that can be controlled by the brain

Involuntary

muscles that can't be controlled by the brain

Muscle Rule 1

muscles must have at least 2 attachments and must cross at least one joint

Muscle Rule 2

muscles always pull and get shorter

Muscle Rule 3

the attachment that moves is known as the insertion, and the attachment that remains stationary is known as the origin

Muscle Rule 4

muscles that decrease the angle between ventral surfaces of the body are known as flexors. Muscles that increase the angle between ventral surfaces of the body are known as extensors

Muscle Rule 5

muscles work in opposing pairs

Muscle Rule 6

muscle striations point to the attachments and show the direction of pull

What tear did Caleb have?

Pectoralis major grade 2 tear

Muscles are named based on what?

based on one or more of its features: shape, size, location, direction of fibers, action/function, attachments, and number of origins.

Skeletal muscles are attached by what?

tendons to bones