Ch. 9-11 Questions (Muscles)

The action of the rhomboid major muscle is to ________. a.) elevate and rotate the scapula upward b.) elevate the scapula c.) adduct and rotate the scapula downward d.) abduct the scapula e.) depress and protract the shoulder

c.) adduct and rotate the scapula downward

Slow muscle fibers ________. a.) have less oxygen than do fast fibers b.) take twice as long to contract after stimulation as do fast fibers c.) can continue to contract long after fast fibers have fatigued d.) are supported by anaerobic metabolism e.) none of these answers are correct

c.) can continue to contract long after fast fibers have fatigued

The facial nerve supplies the muscles of ________. a.) the tongue b.) mastication c.) facial expression d.) the anterior neck e.) the eyes

c.) facial expression

Which powerful hip flexors originate alongside the iliac fossa and the inferior thoracic and lumbar vertebrae? a.) medial rotators of the thigh b.) abductors of the thigh c.) iliopsoas group of the thigh d.) flexors of the thigh e.) adductors of the thigh

c.) iliopsoas group of the thigh

Which of the following is NOT supported by the axial musculature? a.) breathing movements b.) motions to turn the torso toward a stimulus c.) movements to elevate the shoulder d.) motions to nod the head

c.) movements to elevate the shoulder

The muscle that can extend, adduct, and medially rotate the shoulder is (the) ________. a.) latissimus dorsi b.) teres major c.) pectoralis major d.) subscapularis e.) teres minor

a.) latissimus dorsi

A very good sprinter is likely to have ________. a.) more fast twitch fibers than average b.) more slow twitch fibers than average c.) more intermediate fibers than average d.) average muscles; performance is based solely on training e.) none of these answers are correct

a.) more fast twitch fibers than average

Which of these orders of functional muscle structures progresses from the smallest to largest in diameter? a.) myofibril, muscle fiber, fascicle, muscle b.) fascicle, muscle fiber, myofibril, muscle c.) muscle, muscle fiber, myofibril, fascicle d.) muscle, fascicle, muscle fiber, myofibril e.) fascicle, myofibril, muscle fiber, filament

a.) myofibril, muscle fiber, fascicle, muscle

Which place in the body would you be unlikely to find skeletal muscle? a.) finger b.) bladder c.) facial area d.) lower back

b.) bladder

What characteristic of muscle tissue allows it to respond to stimulation by the nervous system? a.) extensibility b.) excitability c.) elasticity d.) contractility e.) none of the answers are correct

b.) excitability

The ________ muscle is found in the lateral compartment of the leg. a.) tibialis posterior b.) fibularis longus c.) tibialis anterior d.) gastrocnemius e.) popliteus

b.) fibularis longus

When one motor neuron fires a single action potential the result affects one ________. a.) sensory unit b.) motor unit c.) lower motor neuron d.) synaptic cleft e.) upper motor neuron

b.) motor unit

The ________ muscle is the most active muscle of the pectoral girdle because it can move the scapula in nearly any direction, depending on the active region and the state of other muscles. a.) rhomboid major b.) trapezius c.) deltoid d.) levator scapulae e.) latissimus dorsi

b.) trapezius

If Rob suffers a fall and tears his pronator teres muscle, what two motions will be affected? a.) pronation of the forearm and extension of the elbow b.) medial rotation of the radius and abduction at the wrist c.) pronation of the forearm and flexion of the elbow d.) supination of the forearm and flexion of the elbow

c.) pronation of the forearm and flexion of the elbow

Which structures are responsible for giving the rectus abdominis its "six-pack" appearance? a.) the external obliques and associated tendons b.) the spinal flexors c.) the linea alba and the transverse inscriptions d.) the internal and external intercostals

c.) the linea alba and the transverse inscriptions

The sliding mechanism of myofilaments works when ________. a.) calcium ions bind to active sites on the actin molecules of the thin filaments b.) the troponin-tropomyosin complex interacts with the actin molecules c.) the myosin heads of the thick filaments bind to the active sites on the actin molecules of the thin filaments d.) the thick filaments detach from the muscle tendon e.) the myosin heads pivot away from the M line toward the Z lines

c.) the myosin heads of the thick filaments bind to active sites on the actin molecules of the thin filaments

Regarding a typical muscle insertion, which of the following is true? a.) The insertion is proximal to the origin b.) If there are several tendons at one end of a muscle and just one at the other, there are multiple insertions c.) If a muscle extends between a broad aponeuorsis and a narrow tendon, the aponeurosis is the insertion d.) The insertion moves more than the origin e.) All of the answers are correct

d.) The insertion moves more than the origin

The layers of connective tissue surrounding a skeletal muscle from the inside to the outside in correct order are ________. a.) epimysium, endomysium, and perimysium b.) perimysium, epimysium, and endomysium c.) epimysium, perimysium, and endomysium d.) endomysium, perimysium, and epimysium e.) endomysium, epimysium, and perimysium

d.) endomysium, perimysium, and epimysium

Upon examination of the connective tissue compartments of the forearm, which muscle group are you UNLIKELY to find in the anterior compartment? a.) all of these muscles would likely be found in the anterior compartment b.) flexor muscles c.) the palmaris muscles d.) extensor muscles

d.) extensor muscles

What muscle is contracting if Theresa is stressed and is tensing her neck and lowering her jaw? a.) trapezius b.) depressor anguli oris c.) occipitofrontalis d.) platysma

d.) platysma

The muscles that form the rotator cuff include the ________. a.) biceps brachii and deltoid b.) subclavius, deltoid, and pectoralis minor c.) supraspinatus, infraspinatus, deltoid, and teres major d.) teres minor, infraspinatus, supraspinatus, and subscapularis e.) pectoralis major, pectoralis minor, and subscapularis

d.) teres minor, infraspinatus, supraspinatus, and subscapularis

A muscle whose contraction is mostly responsible for a movement is said to be the ________ for that movement. a.) antagonist b.) agonist and fixator c.) synergist d.) fixator e.) agonist and prime mover

e.) agonist and prime mover

The triceps brachii muscle is opposed in extension of the elbow by the antagonistic muscle, ________. a.) supinator b.) pronator teres c.) extensor digitorum d.) anconeus e.) brachialis

e.) brachialis

Muscles of mastication most often insert into the ________. a.) eyes b.) muscles adjacent to them c.) tongue d.) bones of the face e.) mandible

e.) mandible

Which of the following muscles is the most powerful muscle involved in the process of chewing or manipulating food in the mouth? a.) hyoglossus b.) pterygoid c.) temporalis d.) omohyoid e.) masseter

e.) masseter