MUSCLE TISSUE Flashcards Preview

PH 121 Anatomy > MUSCLE TISSUE > Flashcards

Flashcards in MUSCLE TISSUE Deck (68):
1

Striated; alternating dark and light bands

Striations of skeletal muscle

2

Multi-nucleated at periphery

Is the nucleus of skeletal muscle single or multinucleated? And where it can be found?

3

Rapid and voluntary

What is the contraction of skeletal muscle?

4

Myofibrils

What are the main component of sarcoplasm?

5

Pushed by the myofibrils

Why are the nuclei of the skeletal muscle are at the periphery?

6

Nonstriated; nonbranching

Is the smooth muscle striated or nonstriated? Branching or nonbranching?

7

Fusiform/ spindle-shaped/ squamous

Shape of the cells in smooth muscle

8

Single and center

Smooth muscle
Nucleus: mono/multinucleated? Periphery/center?

9

Homogenously eosinophilic (red/pink stained)

What is the condition of the smooth muscles' cytoplasm?

10

Involuntary and slow

Contraction of smooth muscle?

11

Striated; branching

Cardiac muscle
Striated/non striated?; branching/nonbranching?

12

Mononucleated; center

Cardiac muscle
Nucleus: multi/mono-nucleated? Center/periphery?

13

Involuntary and rhythmic

What is the contraction of cardiac muscle?

14

Intercalated disk

In cardiac muscle, what makes the cell join together?

15

Muscle
Fascicle
Muscle fiber
Myofibrils
Myofilaments

Organization of skeletal muscle from macro to microscopic

16

Dense connective tissue

What is the kind of CT that epimysium is made up of?

17

Surround the muslce

What does epimysium covers?

18

Thin and branching CT

What is the CT of the perimysium?

19

True

True/false: In perimysiun there is the presence of blood vessels and nerves

20

Fascicle

What does perimysium surrounds?

21

Muscle fiber

What does endomysium surrounds?

22

Delicate network of reticular fibers

What is the composition of endomysium?

23

Myofibril

It is the main bulk of muscle fiber

24

A band

Dark band of myofibril that consist of alternating thin and thick filaments

25

False

True/false: A band also shortens during contraction

26

H band

Central portion of A band; devoid of thin filaments

27

M line

Bisect H band

28

I band

Light band; devoid of thick filaments

29

I band

It is the one that shortens during contraction (myofibril)

30

Z line

Bisects I band

31

Center: A band: 2 contiguous I bands one on each side

The sarcomere includes centrally located _________ and 2 ________ contiguous __________ one on each side

32

Sarcomere

It is the basic contractile unit that is located from one Z line to another Z line

33

M line to Z line

The boundary of extension of the titin (from __ line to __ line) - myofibrils

34

Titin

It maintains location of A band; responsible for the ability of muscle to back into its resing length after being stretched

35

A bands I bands Z lines

These myofibrils are the only ones that can be seen under LM

36

Sarcolemma

Plasma membrane of the muscle

37

External lamina

What is the coating of the external surface of sarcolemma

38

Dystrophin

It is the coating of the inner layer of sarcolemma that prevent muscle cells from being stressed due to continuous stretching

39

Muscular dystrophy

A hereditary disease caused by a defect in the gene for dystrophin

40

Males (9-13 years)

Who are affected by the muscle dystrophy?

41

Satellite cells/myosatellite cells

Precursors of skeletal muscle cell that is found underneath the sarcolemma

42

External lamina

What should be kept intact for the continuous regeneration of satellite cell?

43

Mitochondria

What is the organelle that is called sarcosome in muscle tissue?

44

Sarcoplasm

It contains glycogen granules and myoglobin

45

Glycogen granules

It contains the energy needed for muscle contraction

46

Myofibrils

Oxygen binding protein of skeletal muscle tissue that gives its brown color

47

Sarcoplasmic reticulum

A site for sequestering calcium during muscle relaxation

48

False

True/false: there is the presence of ribosomes in sarcoplasmix reticulum

49

Terminal cisterna

Found at A-I junction that contains calsequestrin

50

Calsequestrin

Protein that sequesters Calcium

51

T-tubule

Found at each pair of terminal cisterna that is a tubular invagination of the sarcolemma extending inward from the surface of the fiber

52

T-tubule

It is the passageway of action potentials from sarcolemma

53

Triad

2 parallel terminal cisterna + T-tubule is called?

54

Two triads

Each sarcomere is composed of how many triad?

55

It aids in muscle contraction

Function of triad

56

False - it is the only thick filament

True or false: Myosin is a thin filament

57

Myosin

A protein that is a major component of the A band

58

Heavy meromyosin
Light meromyosin

These two results from the division of myosin due to enzymatic cleavage

59

Heavy meromyosin

It comprises the head and forms the cross bridge (Myosin)

60

Cross bridging

It happens when the head goes toward actin when muscle contracts

61

False

True/false: Crossbridge is found in H band

62

Light meromyosin

It comprise the tail of the myosin

63

Actin
Tropomyosin
Troponin

Proteins that composed the thin filaments of myofilament

64

Actin

Protein that is the main component of I band

65

Polymerization of G-actin

This process results to one strand of actin

66

F-actin

It is a two stranded actin (2 helically entwined strands)

67

G-actin

It is the binding site of myosin to actin are located

68

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