Muscular System

Question 1

External Oblique

Answer 1

decompresses ribs, flexes spinal column, compresses abdominal cavity

Question 2

Latissimus Dorsi

Answer 2

adducts, medially rotates, and extends the arm

Question 3

Hamstrings

Answer 3

extends hip and flexes knee

Question 4

Internal Oblique

Answer 4

decompresses ribs, flexes spinal column, compresses abdominal cavity

runs opposite to external oblique, and is deeper

Question 5

Gracilis

Answer 5

hip adduction, knee flexion, and knee internal rotation

Question 6

Soleus

Answer 6

extends foot

Question 7

Brachioradialis

Answer 7

flexes forearm at elbow

Question 8

Biceps Brachii

Answer 8

flexes lower arm

Question 9

triceps brachii

Answer 9

extends lower arm

Question 10

Deltoid

Answer 10

abducts the upper arm

Question 11

Frontalis

Answer 11

wrinkles forehead, raises eyebrows

Question 12

Orbicularis Oculi

Answer 12

closes eyelid, tightens skin on forehead

Question 13

Masseter

Answer 13

closes jaw

Question 14

Zygomaticus

Answer 14

raises corners of mouth

Question 15

Orbicularis Oris

Answer 15

compresses and closes lips

Question 16

Sternocleidomastoid

Answer 16

flexes head, rotates head to opposite side

Question 17

Pectoralis major

Answer 17

flexes arms and adducts upper arm

Question 18

Intercostals

Answer 18

expand and shrink chest cavity

Question 19

rectus abdominis

Answer 19

compresses abdomen

Question 20

sartorius

Answer 20

flexes and rotates thigh and leg

Question 21

adductor muscle

Answer 21

adducts the legs

Question 22

gastrocnemius

Answer 22

points toes, flexes lower leg

Question 23

Iliopsoas

Answer 23

flexes and internally rotates thigh at hip joint, flexes trunk

Question 24

Trapezius

Answer 24

moves shoulder, extends head

Question 25

Gluteus medius

Answer 25

abducts and rotates thigh

Question 26

gluteus maximus

Answer 26

extends femur and rotates it outward

Question 27

muscle fiber

Answer 27

muscle cell

Question 28

Fascia

Answer 28

a sheet made of fibrous connective tissue that covers, supports, and separates muscle

Question 29

sarcomere

Answer 29

contractile unit of muscle

Question 30

myofibril

Answer 30

tightly packed filament bundles found within skeletal muscle fibers

Question 31

actin

Answer 31

thin filament of a muscle fiber

Question 32

myosin

Answer 32

thick filament of muscle fiber

Question 33

sarcoplasmic reticulum

Answer 33

houses the calcium needed to bind to the troponin

Question 34

tropomyosin

Question 35

tendon

Answer 35

attaches muscle to bone

Question 36

ligament

Answer 36

attaches bone to bone

Question 37

muscle microanatomy flowchart

Answer 37

muscle (fascia/epimysium) -> fasicle (perimysium) -> muscle fiber (endomysium) -> myofibril

Question 38

sarcolemma

Answer 38

plasma membrane of a muscle fiber

Question 39

transverse tubules (T tubules)

Answer 39

assist in muscle contraction; located along the sarcolemma

Question 40

sarcoplasm

Answer 40

the cytoplasm of the muscle cell; has lots of mitochondria