Chapter 10 (Part 1) Flashcards Preview

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

What are the functions of the muscle system?

A
Produce skeletal movement 
 Maintain posture/body position
 Support soft tissue
 Thermoregulation
 Guards entrances and exits
2
Q

made of groups of muscle fibers (muscle cells)

A

muscle fascicles

3
Q

Covers whole muscle; separates muscle from surrounding tissues and organs

A

epimysium

4
Q

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

A

perimysium

5
Q

surrounds individual muscle fiber

Loosely interconnects adjacent muscle fibers

A

endomysium

6
Q

What does the endomysium contain?

A

capillary network, myosatellite, nerve fibers

7
Q

Bundle of dense regular connective tissue attaching muscle to bone

A

tendon

8
Q

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

A

aponeurosis

9
Q

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

A

deep fascia

10
Q

areolar and adipose connective tissue sheet; separates muscle from skin

A

superficial fascia

11
Q

cell membrane of a muscle fiber

A

sarcolemma

12
Q

cytoplasm of the muscle fiber

A

sarcoplasm

13
Q

Narrow tubes continuous with the sarcolemma and extend into the sarcolemma

A

Transverse tubules

14
Q

Tubular network surrounding each myofibril for storage of calcium ions

A

sarcoplasmic reticulum

15
Q

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

A

terminal cisternae

16
Q

T-tubule + Terminal Cisternae on each side

A

triad

17
Q

Actively move more calcium into the SR from sarcoplasm

A

ion pumps

18
Q

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

A

calcium gated ion channels

19
Q

What does the membrane contain?

A

ion pumps, calcium gated ion channels,

20
Q

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

A

myofibrils

21
Q

protein filaments necessary for muscle contraction

A

myofilament

22
Q

What are the 2 types of myofilament?

A

thick and thin

23
Q

primary protein molecule of thick filament

A

myosin

24
Q

long interwoven polypeptide chains that bind to other myosin molecules

A

myosin tail

25
Q

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

A

myosin head

26
Q

Elastic core extending past myosin which recoils after stretching

A

titin (connectin)

27
Q

primary protein of the thin filament

A

actin

28
Q

What makes up filamentous actin?

A

strands of globular actin

29
Q

Long protein holding the two strands of F-actin together

A

nebulin

30
Q

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

A

tropomyosin

31
Q

What does troponin bind with?

A

Tropomyosin
Actin
Caclium ions when they become present

32
Q

Attachment for thin filaments which interconnects neighboring sarcomeres

A

actinin

33
Q

Repeating functional units of myofilaments extended along myofibrils

A

sarcomeres

34
Q

Thin filaments only in a sarcomere

A

I-band

35
Q

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

A

Z line

36
Q

Location of thick filaments

A

A Band

37
Q

Where thick filaments are interspersed with thin filaments

A

Zone of overlap

38
Q

Only thick filaments in A band

A

H Band

39
Q

Middle of H band which connects thick filaments

A

M line

40
Q

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

A

Sliding filament theory

41
Q

H bands get ___ when contraction occurs

A

Smaller

42
Q

I bands get ___ when contraction occurs

A

smaller

43
Q

Z lines move _____ when contraction occurs

A

closer together

44
Q

Zone of overlap gets ___ when contraction occurs

A

Larger