10 The Muscular System

The muscle that provides the major force for producing a specific movement is a(n) ______. prime mover antagonist synergist fixator Answer: a. prime mover

The muscle that provides the major force for producing a specific movement is a(n) ______. prime mover antagonist synergist fixator Answer: a. prime mover 3

A muscle that immobilizes a bone, or a muscle's origin so that the prime mover has a stable base in which to act, is called a __________. secondary stabilizer antagonist synergist fixator Answer: d. fixator

A muscle that immobilizes a bone, or a muscle's origin so that the prime mover has a stable base in which to act, is called a __________. secondary stabilizer antagonist synergist fixator Answer: d. fixator 5

You could conclude that a muscle with the term "rectus" included in its name is a muscle whose fibers run ______ to the body's vertical axis. at a right angle obliquely parallel perpendicular Answer: c. parallel

You could conclude that a muscle with the term "rectus" included in its name is a muscle whose fibers run ______ to the body's vertical axis. at a right angle obliquely parallel perpendicular Answer: c. parallel 7

Muscle power is primarily dependent on ________. the degree to which a muscle can shorten the number of cells in the muscle the muscle's shape the direction of fibers in the muscle Answer: b. the number of cells in the muscle

Muscle power is primarily dependent on ________. the degree to which a muscle can shorten the number of cells in the muscle the muscle's shape the direction of fibers in the muscle Answer: b. the number of cells in the muscle 9

Bones and muscles work together to move your body Bones and muscles work together to move your body. In this case one bone is the ______ and a second bone is the ________. fulcrum; lever lever; pulley pulley; load lever; load Answer: d. lever; load

Bones and muscles work together to move your body Bones and muscles work together to move your body. In this case one bone is the ______ and a second bone is the ________. fulcrum; lever lever; pulley pulley; load lever; load Answer: d. lever; load 11

In which class of levers is the load between the fulcrum and the effort? First class Second class Third class Fourth class Answer: b. Second class

In which class of levers is the load between the fulcrum and the effort? First class Second class Third class Fourth class Answer: b. Second class 13

Flexing the forearm with the biceps brachii is an example of which class of lever system? First class Second class Third class Fourth class Answer: c. Third class

Flexing the forearm with the biceps brachii is an example of which class of lever system? First class Second class Third class Fourth class Answer: c. Third class 15

The muscles of the ______ are rather unusual for muscles because they insert onto the skin or other muscles. face posterior thigh abdomen hand Answer: a. face

The muscles of the ______ are rather unusual for muscles because they insert onto the skin or other muscles. face posterior thigh abdomen hand Answer: a. face 17

This muscle is the primary muscle used in smiling. Mentalis Platysma Orbicularis oculi Zygomaticus Answer: d. Zygomaticus

This muscle is the primary muscle used in smiling. Mentalis Platysma Orbicularis oculi Zygomaticus Answer: d. Zygomaticus 19

When you bite down on an ice cube, this muscle strongly contracts. Lateral pterygoid Buccinator Hyoglossus Masseter Answer: d. Masseter

When you bite down on an ice cube, this muscle strongly contracts. Lateral pterygoid Buccinator Hyoglossus Masseter Answer: d. Masseter 21

When you lie on your back, your ______ muscles contract to lift your head. sternocleidomastoid scalene splenius platysma Answer: a. sternocleidomastoid

When you lie on your back, your ______ muscles contract to lift your head. sternocleidomastoid scalene splenius platysma Answer: a. sternocleidomastoid 23

The muscles of the back that are most susceptible to injury during heavy lifting belong to the ______ muscle group. quadratus lumborum erector spinae semispinalis splenius Answer: b. erector spinae

The muscles of the back that are most susceptible to injury during heavy lifting belong to the ______ muscle group. quadratus lumborum erector spinae semispinalis splenius Answer: b. erector spinae 25

The ______ is (are) the most important muscle(s) for inspiratory breathing. internal intercostals diaphragm scalenes rectus abdominis Answer: b. diaphragm

The ______ is (are) the most important muscle(s) for inspiratory breathing. internal intercostals diaphragm scalenes rectus abdominis Answer: b. diaphragm 27

The levator ani and ______ muscles form the pelvic diaphragm. ischiocavernosus bulbospongiosus coccygeus gluteus maximus Answer: c. coccygeus

The levator ani and ______ muscles form the pelvic diaphragm. ischiocavernosus bulbospongiosus coccygeus gluteus maximus Answer: c. coccygeus 29

The ______ muscles are antagonistic to each other when moving the scapula forward and backward. pectoralis major and subclavius latissimus dorsi and rhomboid pectoralis minor and serratus anterior serratus anterior and trapezius Answer: d. serratus anterior and trapezius

The ______ muscles are antagonistic to each other when moving the scapula forward and backward. pectoralis major and subclavius latissimus dorsi and rhomboid pectoralis minor and serratus anterior serratus anterior and trapezius Answer: d. serratus anterior and trapezius 31

The _______ muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. shoulder blade rotator cuff humerus arm extender Answer: b. rotator cuff

The _______ muscles include the supraspinatus, infraspinatus, teres minor, and subscapularis. shoulder blade rotator cuff humerus arm extender Answer: b. rotator cuff 33

Swimmers tend to have particularly well-developed ______ muscles. coracobrachialis teres minor subscapularis latissimus dorsi Answer: d. latissimus dorsi

Swimmers tend to have particularly well-developed ______ muscles. coracobrachialis teres minor subscapularis latissimus dorsi Answer: d. latissimus dorsi 35

Doing pull-ups with the palms facing anteriorly effectively exercises the ______ muscles of the arm. triceps brachii anconeus brachialis pronator teres Answer: c. brachialis

Doing pull-ups with the palms facing anteriorly effectively exercises the ______ muscles of the arm. triceps brachii anconeus brachialis pronator teres Answer: c. brachialis 37

The prime mover of pronation is the ______. brachioradialis palmaris longus pronator quadratus supinator Answer: c. pronator quadratus

The prime mover of pronation is the ______. brachioradialis palmaris longus pronator quadratus supinator Answer: c. pronator quadratus 39

The ______ muscle is the most powerful muscle in the body. quadriceps femoris adductor magnus gracilis iliopsoas Answer: a. quadriceps femoris

The ______ muscle is the most powerful muscle in the body. quadriceps femoris adductor magnus gracilis iliopsoas Answer: a. quadriceps femoris 41

The ______ muscles comprise the triceps surae that inserts onto the calcaneal tendon and are prime movers of plantar flexion. plantaris and popliteus soleus and tibialis anterior gastrocnemius and tibialis posterior gastrocnemius and soleus Answer: d. gastrocnemius and soleus 42

The ______ muscles comprise the triceps surae that inserts onto the calcaneal tendon and are prime movers of plantar flexion. plantaris and popliteus soleus and tibialis anterior gastrocnemius and tibialis posterior gastrocnemius and soleus Answer: d. gastrocnemius and soleus 43