A&P Chapter 11 HW Questions

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Which of these changes concerning the muscular system of an elderly person is least likely?

easier to stretch

Which of these contributes to the loss of muscle power and mass with age?

Lower exercise tolerance, slower repair, fibrosis (ALL of the above)

Which organ system functions to rid the body of the heat generated by exercising muscles?

cardiovascular, integumentary, respiratory (ALL of the above)

Which organ system provides oxygen so that exercising muscle fibers can efficiently produce ATP?

both respiratory and cardiovascular

A muscle whose fascicles all pull in the same direction is a __________ muscle.

parallel

The fascicle arrangement that permits the greatest extent of muscle shortening is __________.

parallel

Muscles that surround the mouth and eyes are __________ muscles.

circular

The biceps brachii-humerus arrangement represents a __________ -class lever system.

third

Lever systems where the force is applied between the fulcrum and the load are called __________ levers. An example is flexion of the forearm by biceps brachii.

third-class

A muscle that opposes the action of another muscle is called its __________.

antagonist

A muscle that assists another by stabilizing its origin is called its __________.

fixator

The movement produced by a muscle is called its __________.

action

The lateral rotators act on the __________.

femur

The piriformis originates on the __________ and inserts on the __________.

sacrum; greater trochanter of the femur

The flexor hallucis longus muscle originates on the __________.

interosseous membrane

The soleus and the gastrocnemius share an insertion on the __________.

calcaneus

The extensor muscle that branches to form four tendons on the back of the hand is the __________.

extensor digitorum

The deep posterior extensor of the wrist and fingers __________.

controls the thumb and index finger

Which deep posterior extensor of the wrist originates on the radius and ulna and interosseous membrane?

the abductor pollicis longus

The hamstring muscles originate on the __________.

ischial tuberosity

The prime mover of wrist extension is the __________.

extensor digitorum

Wrist abduction occurs through the actions of __________ muscles.

four

The prime mover of dorsiflexion is the __________.

tibialis anterior

Eversion of the foot is a function of the __________.

fibularis longus

The most powerful movement at the ankle joint is __________, and the ________ is one of the prime movers of this movement.

plantar flexion; gastrocnemius

The action that moves the scapula towards the head is called __________.

elevation

Which movement results after the contraction of the serratus anterior muscle?

scapular protraction and rotation

Which movement is not associated with the scapula?

opposition

To keep the humeral head centered within the glenoidal cavity the rotator cuff muscles must be __________.

located in the same plane

The location of the rotator cuff muscles in relation to the glenohumoral joint minimizes the upward pressure against the __________.

acromion of the scapula

To allow for flexion, the __________ unlocks the knee joint.

popliteus

The muscle that generates the most power during elbow flexion is the __________.

brachialis

The prime mover of elbow extension is the __________.

triceps brachii

An insertion of the fibularis longus is the __________.

medial cuneiform

All fibers of the pectoralis major muscle converge on the lateral edge of the__________.

intertubercular sulcus

The anterior axial muscle that crosses the glenohumeral joint is the pectoralis major muscle.

True

The posterior axial muscle that crosses the glenohumeral joint is the __________.

latissimus dorsi

The iliacus and the psoas major muscles are collectively known as the ____________ muscle because they share a common insertion on the __________ of the femur.

iliopsoas; lesser trochanter

The two muscles that insert on the fifth phalanx or on the fifth metatarsal are the __________.

extensor digitorum longus and fibularis tertius

The interosseous membrane is located between the __________.

radius and ulna

Which muscle of the wrist and fingers is a deep anterior flexor?

flexor pollicis longus

Which superficial flexor muscle of the forearm is the most lateral?

flexor carpi radialis

The palmaris longus inserts on the __________.

palmar aponeurosis

Which muscle is a superficial anterior flexor muscle?

flexor digitorum superficialis

The anterior muscles of the thigh that originate on the os coxae are __________.

santorius; rectus femoris

A reduction in the lateral angle of the glenohumeral joint in relation to the anatomical position would be called __________.

adduction

Movement of the shoulder laterally away from the body is called __________.

abduction

The actions of the muscles that cross the hip do not include __________.

inversion

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