Muscular System

Human Anatomy Final Exam

16 cards·by cat02

Skeletal Muscle

Termed striated with parallel muscle fibres, under conscious control.

Smooth Muscle

Non-striated with non-parallel muscle fibres, under unconscious control

Cardiac Muscle

Striated with non-parallel muscle fibres, involuntary muscle of the heart, under concious control.

Functions of Skeletal Muscle

Movement, Posture/Balance, Protection, Temperature

Isometric muscle contraction

muscle tension with no movement, ex. Plank.

Isotonic muscle contractions

Concentric: tension by shortening the muscle, ex. Curling a dumbbell. OR Eccentric: tension by lengthening the muscle, ex. Negatives

Levers contain 3 parts...

Fulcrum, Force, Resistance

Fulcrum

joint where movement occurs

Force

muscle or gravity that is applied to the moveable bone.

Resistance

the weight being moved

1st Class Lever: similar to seesaw

Fulcrum is in the middle with weight/resistance on either side ex. head extension

2nd Class Lever: similar to wheelbarrow

Fulcrum at the end of the lever, with resistance close to the fulcrum/force further away

3rd Class Lever: most of them

Fulcrum at the end of the lever, with resistance toward the other end of the lever and the force between the resistances

O: Origin

Proximal attachment of the trunk (Closes to the trunk)

I: Insertion

Distal attachment of the trunk (Furthest from the trunk)

A: Action

The action of the muscle on one or more articulations