10/21 Class Lecture Chapter 9 Flashcards

1
Q

how much muscle tissue makes up the body mass

A

half of bodys mass

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2
Q

prefixes for muscle

A

Myo, mys, and sarco

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3
Q

skeletal muscle characteristics

A
Organs attached to bones and skin 
Elongated cells called muscle fibers
striated 
voluntary 
Contract rapidly; tire easily; powerful
Require nervous system stimulation
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4
Q

special characteristics of muscle tissues

A

excitability
contractility
extensibility
elasticity

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5
Q

excitability

A

(responsiveness): ability to receive and respond to stimuli electricity, causes muscles to “jump”

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6
Q

contractility

A

ability to shorten forcibly when stimulated responds through contractility, shorts with force- why muscle is usefull

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7
Q

extensibility

A

ability to be stretched, expands but not forcibly (muscle pulls, it does not push)

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8
Q

elasticity

A

ability to recoil to resting length, flexible tissue

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9
Q

what are the reasons for the muscle characteristics

A

the muscle functions

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10
Q

Functions of muscles

A

Movement of bones or fluids (e.g., blood)
Maintaining posture and body position
stabilizing joints
heat generation
Protects organs, forms valves, controls pupil size, causes “goosebumps”

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11
Q

what is a skeletal muscle served by

A

one artery, one nerve, and one or more veins

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12
Q

how are skeletal muscles structured

A

connective tissue sheaths of skeletal muscle

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13
Q

epimysium

A

dense irregular connective tissue surrounding entire muscle; may blend with fascia (broad sheet of muscle)

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14
Q

perimysium

A

fibrous connective tissue surrounding fascicles (groups of muscle fibers)

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15
Q

endomysium

A

fine areolar connective tissue surrounding each muscle fiber, most microscopic

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16
Q

skeletal muscle attachments

A

insertion
origin
action
innervation

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17
Q

insertion

A

moveable bone

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18
Q

origin

A

immovable (less movable) bone

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19
Q

action

A

what is does (ex. Flexes forearm)

20
Q

innervation

A

what nerve

21
Q

direct skeletal muscle attachment

A

epimysium fused to periosteum of bone or perichondrium of cartilage

22
Q

indirect skeletal attachment

A

connective tissue wrappings extend beyond muscle as ropelike tendon or sheetlike aponeurosis

23
Q

sarcolemma

A

plasma membrane

24
Q

sarcoplasm

25
what is in sarcoplasm
glycosomes | myoglobin
26
glycosomes
glycogen storage for energy
27
myloglobin
for O2 storage (store a few minutes worth) as you get in shape they can store more to a degree
28
modified structures of skeletal muscle fibers
myofibrils, sarcoplasmic reticulum, and T tubules
29
what does the skeleton need for contract
calcium
30
what are myofibrils
Densely packed, rodlike elements ~80% of cell volume bascially 2 proteins Contain sarcomeres Exhibit striations
31
sarcomeres
contractile units
32
What are the striations
- perfectly aligned repeating series of dark A bands and light I bands A is the dArk band, I is the lIght band
33
Parts of muscle tissues striations
H Zone, M Line, Z disc, thick and thin filaments, sacromeres, myosin, actin
34
H zone
lighter region in midsection of dark A band where filaments do not overlap
35
M line
line of protein myomesin bisects H zone, m as in middle, anchoring point for the thick filaments
36
z discs
coin-shaped sheet of proteins on midline of light I band that anchors thin filaments and connects myofibrils to one another tube shaped strucutres, anchoring point for thin filaments
37
thick filaments
run entire length of an A band
38
thin filaments
run length of I band and partway into A band
39
myosin
proteins fibers darker filaments
40
actin
lighter filaments
41
sarcomere characteristics
Smallest contractile unit (functional unit) of muscle fiber Align along myofibril like boxcars of train, all next to eachother linked together Contains A band with ½ I band at each end Composed of thick and thin myofilaments made of contractile proteins
42
actin myofilaments
thin filaments Extend across I band and partway in A band Anchored to Z discs
43
myosin myofilaments
thick filaments Extend length of A band Connected at M line
44
Sarcoplasmic reticulum
Network of smooth endoplasmic reticulum surrounding each myofibril Most run longitudinally Pairs of terminal cisterns form perpendicular cross channels Highly organized Functions in regulation of intracellular Ca2+ levels Stores and releases Ca2+ and reabsorb it which allows the muscle to contract
45
what is contained in T Tubules
triads and transverse
46
characteristics of T Tubules
Continuations of sarcolemma Lumen continuous with extracellular space Increase muscle fiber's surface area Penetrate cell's interior at each A band–I band junction Associate with paired terminal cisterns to form triads that encircle each sarcomere