Muscular System Intro

Contraction occurs when muscle cells...

• Lengthen

• Shorten

• Stay the same size

• Enlarge

When you bend your arm, which muscle is contracting, or shortening?

• Biceps brachii

• Triceps brachii

What muscle attaches to the bone and produces movement?

• skeletal muscle

• cardiac muscle

• smooth muscle

• visceral muscle

Which action points the toes away from the shin?

• Inversion

• Eversion

• Dorsiflexion

• Plantar flexion

Which action bends a joint, or decreases the angle between bones?

• Circumduction

• Rotation

• Extension

• Flexion

Movement of the arm/leg away from the midline

• adduction

• eversion

• inversion

• abduction

The triceps brachii straightens the forearm to increase the angle between the humerus and ulna. This is an example of

• Circumduction

• Rotation

• Extension

• Flexion

Choose which muscle naming rules are used for (check all that apply):

Pectoralis major

• Location of muscle

• Direction of the muscle fibers

• Relative size of the muscle

• Number of origins

• Location of the muscle's origin and insertion

Choose which muscle naming rules are used for (check all that apply):

Extensor digitorum longus

• Direction of muscle fibers

• Location of muscle

• Action of muscle

• Relative size of the muscle

• Shape of the muscle

Choose which muscle naming rules are used for (check all that apply):

External oblique

• Location of muscle

• Direction of muscle fibers

• Relative size of the muscle

• Action of the muscle

• Location of muscle's origin and insertion