Lab 9

Question 1

skeletal muscle are also known as muscle fibers, what are the three main contractile proteins?

Answer 1

myosin- thick
actin- thin
titin- elastic

Question 2

each muscle fiber is surrounded in a sheath of c.t called?

Answer 2

endomysium

Question 3

muscle fibers are organized into bundles called?

Answer 3

fascicles

Question 4

fascicles are surrounded by a sheath of c.t called?

Answer 4

perimysium

Question 5

what is parallel organization of muscle fascicles?

Answer 5

allows maximal change in length

Question 6

pennate organization of muscle fascicles?

Answer 6

has shorter muscle fibers that attach at an oblique angle to a common tendon and produces more tension than a parallel muscle of same size

Question 7

circular organization of muscle fascicles?

Answer 7

controls entrances and exits of body

Question 8

convergent organization of muscle fascicles?

Answer 8

arrangement allows for versatility in the direction of pull

Question 9

what is the origin of muscle?

Answer 9

fixed point of attachment of a muscle- does not move when contracts

Question 10

what is the insertion of the muscle?

Answer 10

movable point of attachment of a muscle

Question 11

what is the agonist?

Answer 11

muscle whose action is chiefly responsible for producing a particular movement

Question 12

what is the synergist?

Answer 12

muscle that assists a prime mover (agonist) and its action

Question 13

what is the antagonist?

Answer 13

muscle whose action opposes that of agonist

Question 14

temporalis?

Answer 14

elevates mandible

Question 15

sternocleidomastoid?

Answer 15

flexes neck, bends head to shoulders, turns face side to side

Question 16

orbicularis oculi?

Answer 16

closes eye

Question 17

masseter?

Answer 17

elevates mandible

Question 18

orbicularis oris?

Answer 18

purses of compresses lip

Question 19

pectoralis major?

Answer 19

flexion and adduction at shoulder

Question 20

rectus abdominis?

Answer 20

flexes vertebral column, depresses ribs, compresses abdomen

Question 21

external oblique?

Answer 21

lateral flexion of vertebral column, rotation of trunk

Question 22

pectoralis minor?

Answer 22

depresses scapula, elevates rib

Question 23

external intercostals?

Answer 23

elevate ribs to inhale

Question 24

internal intercostals?

Answer 24

depress ribs during forced exhalation

Question 25

internal oblique?

Answer 25

lateral flexion of vertebral column, rotation of trunk

Question 26

rhomboids?

Answer 26

adduction, retraction of scapulae

Question 27

trapezius?

Answer 27

elevates, adducts, depresses scapulae, elevates clavicle

Question 28

latissimus dorsi?

Answer 28

adduction, extension of arm or shoulder

Question 29

triceps brachii?

Answer 29

extension of arm at elbow

Question 30

wrist and finger flexors?

Answer 30

flexion at wrist and finger flexion

Question 31

deltoid?

Answer 31

adduction at shoulder, flexion and extension of arm at shoulder

Question 32

biceps brachii?

Answer 32

flexion of arm at elbow

Question 33

brachioradialis?

Answer 33

flexion of arm at elbow

Question 34

wrist and finger extensors?

Answer 34

extension at wrist and finger extension

Question 35

adductor group?

Answer 35

adduction of thigh at hip

Question 36

sartorius?

Answer 36

flexion at hip and knee; lateral rotation and abduction at hip

Question 37

gluteus medius?

Answer 37

abduction and medial rotation of thigh at hip

Question 38

tensor fasciae latae?

Answer 38

abduction and medial rotation of thigh at hip

Question 39

quadriceps group?

Answer 39

flexion of thigh at hip, extension of leg at knee

Question 40

tibialis anterior?

Answer 40

dorsiflexion at ankle

Question 41

gluteus anterior?

Answer 41

dorsiflexion at ankle

Question 42

gluteus maximus?

Answer 42

extension/ hyperextension and lateral rotation of thigh at hip

Question 43

hamstring group?

Answer 43

flexion of leg at knee ad extension of thigh at hip

Question 44

gastrocnemius?

Answer 44

plantar flexion at ankle

Question 45

soleus?

Answer 45

plantar flexion at ankle