A&P 1 – Chapter 10- The Muscular System

________ are the muscles primarily responsible for producing a particular movement.

agonists

Which functional group has the major responsibility for producing a specific movement?

agonists

Which of the following is NOT used as a criterion for naming muscles?

whether the muscle is controlled by the involuntary or voluntary nervous system

Choose the FALSE statement.

The hamstrings are prime movers of hip (thigh) flexion and knee (leg) flexion

Which of the following muscles is named for its action?

levator labii superioris

Which of the following muscles is named for its origin and insertion?

sternocleidomastoid

Most skeletal muscles of the body act in ________.

third-class lever systems

Which of the following movements demonstrates a first-class lever?

raising your head up off your chest

Which of the following is CORRECTLY matched?

convergent arrangement of fascicles: fan shaped muscle

What type of muscle assists an agonist by causing a like movement or by stabilizing a joint over which an agonist acts?

a synergist

What is the major factor controlling how levers work?

the difference in the positioning of the effort, load, and fulcrum

First-class levers ________.

in the body can operate at a mechanical advantage or mechanical disadvantage, depending on specific location

Muscle power does not depend on the direction of the fascicles.

True

Which type of lever is demonstrated by using scissors?

a first-class lever

The arrangement of a muscle’s fascicles determines its range of motion and power.

True

Regardless of type, all levers follow the same basic principle: effort farther than load from fulcrum = mechanical advantage; effort nearer than load to fulcrum = mechanical disadvantage.

True

Although all skeletal muscles have different shapes, the fascicle arrangement of each muscle is exactly the same.

False

If L = load, F = fulcrum, and E = effort, what type of lever system is described as LEF?

third-class lever

Which generalization concerning movement by skeletal muscles is not true?

During contraction the two articulating bones move equally.