Chapter 10 (Part 1) Flashcards Preview

BMS 250 > Chapter 10 (Part 1) > Flashcards

Flashcards in Chapter 10 (Part 1) Deck (44):
1

What are the functions of the muscle system?

Produce skeletal movement
Maintain posture/body position
Support soft tissue
Thermoregulation
Guards entrances and exits

2

made of groups of muscle fibers (muscle cells)

muscle fascicles

3

Covers whole muscle; separates muscle from surrounding tissues and organs

epimysium

4

Around muscle fascicle, divides skeletal muscle into series of fascicles, contains blood vessels and nerves which will serve the muscle fibers located within

perimysium

5

surrounds individual muscle fiber
Loosely interconnects adjacent muscle fibers

endomysium

6

What does the endomysium contain?

capillary network, myosatellite, nerve fibers

7

Bundle of dense regular connective tissue attaching muscle to bone

tendon

8

Broad sheet of dense regular connective tissue providing a larger attachment which may include more than one bone

aponeurosis

9

dense irregular connective tissue sheet external to the epimysium, separates muscle from each other

deep fascia

10

areolar and adipose connective tissue sheet; separates muscle from skin

superficial fascia

11

cell membrane of a muscle fiber

sarcolemma

12

cytoplasm of the muscle fiber

sarcoplasm

13

Narrow tubes continuous with the sarcolemma and extend into the sarcolemma

Transverse tubules

14

Tubular network surrounding each myofibril for storage of calcium ions

sarcoplasmic reticulum

15

end of SR which has enlarged and fused with the t-tubule

terminal cisternae

16

T-tubule + Terminal Cisternae on each side

triad

17

Actively move more calcium into the SR from sarcoplasm

ion pumps

18

Open in response to electrical stimulus allowing calcium out of the SR.

calcium gated ion channels

19

What does the membrane contain?

ion pumps, calcium gated ion channels,

20

bundles of myofilaments, protein filaments, surrounded by transverse tubules running the length of the muscle fiber

myofibrils

21

protein filaments necessary for muscle contraction

myofilament

22

What are the 2 types of myofilament?

thick and thin

23

primary protein molecule of thick filament

myosin

24

long interwoven polypeptide chains that bind to other myosin molecules

myosin tail

25

contain two globular protein subunits and will interact with thin filament during contraction forming a crossbridge

myosin head

26

Elastic core extending past myosin which recoils after stretching

titin (connectin)

27

primary protein of the thin filament

actin

28

What makes up filamentous actin?

strands of globular actin

29

Long protein holding the two strands of F-actin together

nebulin

30

Long double stranded protein molecule which blocks myosin bind sites on actin when muscles are at rest

tropomyosin

31

What does troponin bind with?

Tropomyosin
Actin
Caclium ions when they become present

32

Attachment for thin filaments which interconnects neighboring sarcomeres

actinin

33

Repeating functional units of myofilaments extended along myofibrils

sarcomeres

34

Thin filaments only in a sarcomere

I-band

35

Center of I-band where thin filaments are anchored into actinin

Z line

36

Location of thick filaments

A Band

37

Where thick filaments are interspersed with thin filaments

Zone of overlap

38

Only thick filaments in A band

H Band

39

Middle of H band which connects thick filaments

M line

40

When skeletal muscle fibers contract the thin filaments slide past thick filaments during contraction

Sliding filament theory

41

H bands get ___ when contraction occurs

Smaller

42

I bands get ___ when contraction occurs

smaller

43

Z lines move _____ when contraction occurs

closer together

44

Zone of overlap gets ___ when contraction occurs

Larger