Chapter 10 Muscle Tissues Notes Flashcards Preview

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Flashcards in Chapter 10 Muscle Tissues Notes Deck (28):
1

6 functions of skeletal muscle

produce skeletal movement
maintain position
support soft tissues
guard openings
maintain temp
store nutrients

2

dense layer of connective tissue that surrounds entire skeletal muscle

epimysium

3

delicate connective tissue that surrounds skeletal muscle fibers and ties adjacent muscle fibers together

endomysium

4

bundle of collagen fibers at the end of a skeletal muscle that attaches the muscle to bone

tendon

5

advantage of having many nuclei in a skeletal muscle fiber

large amount of proteins can quickly grow/repair

6

skeletal muscle fibers are formed by embryonic cells called

myoblasts

7

repeating unit of a skeletal muscle fiber

sarcomeres

8

interactions between actin and myosin filaments of the sarcomere are responsible for

contractions

9

cross-bridges are portions of

actin filaments

10

active sites are blocked by

tropomyosin

11

narrow space between synaptic terminal and muscle fiber

synaptic cleft

12

active sites on the actin become available for binding after

calcium bonds to receptor

13

two protein molecules connected by myosin cross-bridges during muscle contraction

myosin
actin

14

rapid rise and fall in force produced by a muscle fiber after a single action potential

twitch

15

contraction in which muscle fibers do not shorten

isometric contraction

16

at peak levels of muscle exertion the mitochondria can supply

1/3 of ATP needed

17

after heavy exercise, of energy reserves in a muscle are depleted, this occurs

oxygen debt

18

type of muscle fiber that is most resistant to fatigue

slow fiber

19

muscular force can be adjusted to match different loads by

-more/larger motor units
-increase frequency/action potential

20

the cytoplasm of neuromuscular terminal contains vesicles filled with molecules of the neurotransmitter

ACH

21

aerobic metabolism provides _____ percent of the ATP demands of a resting muscle cell

95%

22

large diameter, densely packed myofibrils, large glycogen reserves, and few mitochondria are characteristics of

fast fibers

23

when hormone directly stimulates growth of muscle tissue, leading to increased muscle mass

testosterone

24

because skeletal muscle contractions demand large quantities of ATP, skeletal muscles have the following adaptations:

blood vessels
mitochondria

25

after death, muscle fibers run out of ATP and calcium begins to leak from the sarcoplasmic reticulum into the sarcoplasm

rigor mortis

26

large motors are found in ______ muscles, and small motors are found in ______ muscles

larger
smaller

27

what would happen if blood flow decrease to a muscle

lack oxygen
shift to glycosis
fatigue
pyruvic acid to lactic acid

28

__ myosin head binds ATP molecule and detaches from actin
__ free myosin head splits ATP
__ calcium ion is releases from sarcoplasmic reticulum
__ myosin cross-bridges bind to actin
__ myosin head pivots toward center of sarcomere
__ calcium ion binds to troponin

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