Chapter 9: Muscular System Flashcards Preview

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Flashcards in Chapter 9: Muscular System Deck (42)
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Masseter

Fuction

Closes jaw

1

Sternocleidomastoid

Function

Turns head

2

Latissimus dorsi

Function

Adduction of arm

3

Trapezius

Function

Raise shoulders

4

Pectorals

Function

Adduction of arms

"flex"

5

Triceps

Function

Extend arm

6

Biceps

Function

Flexes elbow and supinates forearm

7

Deltoids

Function

Abducts arms

Rotation

8

Obliques

Function

Stabilize spine

9

Rectus abdominis

Function

Stabilize core

10

Vastus lateralis

Function

Extend and stabilizes knee

11

Quadriceps femoris

Function

Knee extension "flex"

Hip flexion

12

Hamstrings

Function

Flexion of the knee

Extension of hip

13

Tibialis anterior

Function

Dorsiflexion and inversion of the foot

14

Gastrocnemius

Function

Plantar flexion

15

Gluteus maximus

Function

Sitting and climbing

16

Synaptic cleft

Space between the nerve and motor end plate

17

Muscle contraction

Myosin heads of the thick filaments pull on the thin filaments causing you to slide towards the center

18

Muscle contraction requires…

Calcium and ATP

19

Myosin

Thick filament

20

Actin

Thin filament

Contains two other proteins: tropomyosin and troponin

Contains a myosin-binding site where myosin can attach

21

Myofibrils

Cylindrical structures that contain two types of proteins:

Actin

Myosin

22

Sarcoplasmic reticulum

"SR"

Fluid filled membrane enclosed tubules that store calcium for muscle contraction

23

Sarcoplasm

Muscle fibers cytoplasm, packed with mitochondria which produce large amounts of ATP

24

Transverse tubules

T-tubules

Tunnel in from the surface towards the center of the muscle fibers

25

Sarcolemma

Plasma membrane that covers the muscle fiber

26

Tendon

Dense regular connective tissue that attaches muscle to a bone

27

Muscle fiber

Elongated, cylindrical cells arranged parallel to each other

28

Endomysium

Connective tissue, surrounds each individual muscle fiber

29

Perimysium

Connective tissue that surrounds bundles of muscle fibers called fascicles