Muscular System

Question 1

Skeletal Muscle

Answer 1

fibers are multinucleated structures that compose the skeletal muscle, voluntary

Question 2

Cardiac Muscle

Answer 2

are only found in the heart, involuntary

Question 3

Smooth Muscle

Answer 3

called so because they do not have striations. These can be found in hollow organs such as bladder, stomach, uterus, intestines, and passageways of circulatory system, involuntary

Question 4

Exicability

Answer 4

Able to send electrical waves (action potential) along the entire length

Question 5

Elasticity

Answer 5

Having the ability to recoil back to its original length

Question 6

Extensibility

Answer 6

allows muscles to stretch or extend

Question 7

Contractility

Answer 7

allows muscles to pull on its attachment and shorten

Question 8

Epimysium

Answer 8

outermost layer, surrounds entire muscle

Question 9

Perimysium

Answer 9

separates and surrounds fascicles

Question 10

Endomysium

Answer 10

surrounds each individual muscle fiber

Question 11

Sarcolemma

Answer 11

muscle fiber membrane

Question 12

Myofibril

Answer 12

individual parallel muscle fibers (made up of actin and myosin)

Question 13

Sarcoplasm

Answer 13

inner material surrounding the myofibril (equivalent to the cell’s cytoplasm)

Question 14

Fascicle

Answer 14

the muscle fibers that are arranged in bundles

Question 15

Actin

Answer 15

thin filaments

Question 16

Myosin

Answer 16

thick filaments

Question 17

Subclavius

Answer 17

depression

stabilizes clavicle during movement by depressing it

Question 18

Serratus Anterior

Answer 18

scapula: protracts; ribs: elevates

moves arm from side of body to front of body; assists with inhalation

Question 19

Trapezius

Answer 19

scapula: rotates inferiorly, retracts, elevates and depresses; spine: extends
elevates shoulders (shrugging); pulls shoulder blades together; tilts head backwards

Question 20

Rhomboid Major

Answer 20

retracts; rotates inferiorly

stabilizes scapula during pectoral girdle movement

Question 21

Pectoralis Major

Answer 21

flexion; adduction; medial rotation

brings elbows together; moves elbow up (as during an uppercut punch)

Question 22

Latissimus Dorsi

Answer 22

Humerus: extension, adduction, and medial rotation: scapula: depression
moves elbow back (as in elbowing someone standing behind you); spreads elbows apart

Question 23

Deltoid

Answer 23

abduction; flexion; extension medial and lateral rotation

lifts arms at the shoulder

Question 24

Supraspinatus

Answer 24

abduction

rotates the elbow outwards, as during a tennis swing

Question 25

Teres Major

Answer 25

extension; adduction | assists the infraspinatus in rotating the elbow outwards

Question 26

Biceps Brachii

Answer 26

flexation; supination | performs a bicep curl; also allows palm of hand to point toward body while flexing

Question 27

Triceps Brachii

Answer 27

extension | extends forearm; as during a punch

Question 28

Supinator

Answer 28

supination | Tuns hand palm-up

Question 29

Pronator Teres

Answer 29

pronation | turns hand pam-down

Question 30

Iliacus

Answer 30

thigh: flexion and lateral rotation; torso: flexion raises the knee at the hip, as if performing a knee attack; it also assists the lateral rotators in twisting the thigh (and lower leg) outward, and assists with bending over and maintaining posture

Question 31

Gluteus Maximus

Answer 31

extension | lowers the knee and moves the thigh back, as when getting ready to kick a ball

Question 32

Gluteus Medius

Answer 32

abduction | opens the thigh, as when doing a split

Question 33

Gluteus Minimus

Answer 33

abduction | brings the thighs back together

Question 34

Adductor Longus

Answer 34

adduction; flexion | brings the thighs back together; it also assists with raising the knee

Question 35

Rectus Femoris

Answer 35

tibia/fibula: extension; thigh: adduction | moves the back of the lower legs up out in front of the body, as when kicking; it also assists in raising the knee

Question 36

Biceps Femoris

Answer 36

tibia/ fibula: flexation; thigh: extension, lateral rotation moves the back of the lower leg up and back toward the buttocks, as when kneeling; it also moves the thigh down and back and twists the thigh (and lower leg) outward

Question 37

Tibialis Anterior

Answer 37

dorsiflexion; inversion raises the sole of the foot off the ground, as when preparing to foot-tap; bends the inside of the foot upwards, as when catching your balance while falling laterally toward the opposite side as the balancing foot

Question 38

Extensor Hallucis Longus

Answer 38

foot; dorsiflexion; big toe: extension | raises the sole of the foot off the ground , as when preparing to foot-tap; extends the toes

Question 39

Extensor Digitorum Longus

Answer 39

foot: dorsiflexion; toes: extension | raises the sole of the foot off the ground, as when preparing to foot-tap; extends the toes

Question 40

Gastrocnemius

Answer 40

foot: plantar flexion; tibia/fibula: flexion

Question 41

Soleus

Answer 41

plantar flexion | lowers the sole of the foot the ground, as when foot-tapping or jumping; it also maintains postures while walking

Question 42

Tibialis Posterior

Answer 42

plantar flexion | lowers the sole of the foot to the ground, as when foot- tapping or jumping

Question 43

Flexor Digitorum Longus

Answer 43

foot: plantar flexion and inversion; toes: flexion lowers the sole of the foot to the ground, as when foot-tapping or jumping; it also bends the inside of the foot upward and flexes the toes

Question 44

Flexor Hallicis Longus

Answer 44

big toe: flexion; foot: plantar flexion | flexes the big toe