Muscles and Their Actions

In the picture shown this muscle group has what kind of action?

• Plantarflexors

• Dorsiflexors

• Extensors

• Flexors

In this picture, these group of muscles are showing what kind of action?

• Flexors

• Extensors

In this picture, these group of muscles are showing what kind of action?

• Flexors

• Extensors

The insertion:

• is the fixed attachment

• moves with the contraction

flexes arm at shoulder, adducts & medially rotates arm

• latissimus dorsi

• deltoid

• pectoralis major

• teres major

What is the primary characteristic of skeletal muscles?

• They are involuntary and non-striated

• They are voluntary and striated

• They are involuntary and striated

• They are voluntary and non-striated

rotates and retracts scapula, elevates & depresses scapula

• biceps brachii

• trapezius

• serratus anterior

• flexor carpi ulnaris

abducts arm, flexes arm at shoulder, extends arm at shoulder

• brachialis

• deltoid

• trapezius

• brachioradialis

Which muscle type is primarily involved in the movement of limbs?

• Cardiac muscle

• Smooth muscle

• Skeletal muscle

• Involuntary muscle

extends arm at shoulder, adducts & medially rotates arm

• trapezius

• deltoid

• latissimus dorsi

• serratus anterior