Skeletal Muscles Flashcards Preview

Quiz - Joints, Muscle, Myofibril > Skeletal Muscles > Flashcards

Flashcards in Skeletal Muscles Deck (36):
1

One skeletal muscle cell is called a

muscle fiber

2

The cytoplasm is called the

sarcoplasm

3

Functional unit of a skeletal muscle fiber that actually shortens during contraction

sarcomere

4

Thick myofilaments are made of the protein

myosin

5

Thin myofilaments are made of the protein

actin

6

Actin bonds to thick myofilaments called

troponin

7

Troponin bonds to calium ions

tropomyosin

8

Calcium is stored within the

sarcoplasmic reticulum

9

T-tubules

are extensions of the plasma membrane that run deep within the skeletal muscle fiber

10

One _____extends between two z-discs.

sarcomere

11

Actin overlaps myosin in the

A-band

12

The I-bands only contains

Thin myofilaments

13

The thin myofilaments attach directly to

Z-discs

14

Springlike molecules that prevent the sarcomere from overstretching

Titin

15

Bundles of muscle fibers

fascicle

16

Epymisium

CT covering the entire muscle

17

Perymisium

Surrounds each bundle of muscle fibers.

18

Endomysium

CT covering each muscle fiber

19

Antagonist

Muscle that relaxes while others contract

20

Agonist

AKA a prime mover, contracts to carry out a specific movement

21

Synergist

Assists the agonist by causing a similar movement by stabilizing a joint

22

Quadriceps femoris

Rectus Femoris
Vastus lateralis
Vastus medialis
Vastus intermedialis

23

Hamstring

Biceps femoris
Semitendinoses
Semimembranosis

24

Two muscles that contribute to achilles tendon

Gastrocnemius
Soleus

25

Rotator cuff

Deltoid
Supraspinatus
Infraspinatus
Teres minor

26

Abdominal wall muscles

Rectus abdomis
Internal oblique
External oblique
Transverse abdominis

27

Normal inspiration

diaphragm
external intercostal

28

Forceful exhalation

Tire
Internal intercostal

29

Masseter

Chewing food

30

Orbicularis oris

Kiss/whistle

31

Orbicularis oculi

Close eyes

32

Sternocleidomastoid left

rotate head to right shoulder

33

Sternocleidomastoid right

tilt to right shoulder

34

Erector spinae

Keeps posture extends the spine

35

Compress the abdomen

tire

36

Flex vertebral column as you bend fwd from the waist

ire