Chapter 10 Part 1 Flashcards Preview

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Flashcards in Chapter 10 Part 1 Deck (41):
1

Branched striated fibers joined by intercalated discs and involuntarily controlled

Cardiac muscle tissue

2

Spindle shaped non straited fibers located in hollow organs and involuntary control

Smooth muscle tissue

3

Produces movements- stabilize body positions -move substances within body -generates heat; shivering the

Muscle tissue functions

4

Electrical excitability, contractobilty extensibility elasticity

Muscle tissue properties

5

Ability to respond to stimuli I

Electrical excitibilty

6

Ability to contract (shorten)

Contractobilty

7

Ability to stretch

Extensibility

8

Ability to return to original shape

Elasticity

9

A connective tissue that surrounds muscles and consists of 3 layers

Fascia

10

Outer layer surrounds entire muscle

Epinysuim (fascia layer)

11

Middle layer; surrounds fascicles (bundles) of muscle fibers

Perimysium (fascia layer)

12

Inner layer; surrounds individual muscle fibers

Endomysisum (fascia layer)

13

Attach muscles to bones

Tendons

14

Flat sheet like tendon

Appneurosis

15

A muscle fiber consists of smaller muscle fibers known as myofibrlis

Myofiber

16

Consists of the smallest muscle fibers known as thick and thin myofilaments

Myofibrlis

17

Plasma membrane and cytoplasm of muscle cell

Sarcolemma and sarcoplasma

18

Functional units of straited muscle separated by 2 discs

Sarcomeres

19

The darker middle sarea that contains an overlap of both thick and thin filaments

A band

20

The area of each A band containing only thick filaments

H zone

21

The lighter area of sarcomere containing only thin filaments

I band

22

Pass through center of each I band

Z discs

23

Composed of myosin

thick myofilaments

24

Composed of actin

Thin myofilaments

25

Includes myosin and actin

Contractible proteins

26

Include troponin and tropomyosin attached to actin

Regulatory proteins

27

Thick filaments pull on thin filaments sliding them over thick filaments -Z discs move closer together shortening entire muscle

Sliding filament mechanism

28

An enlargement of existing muscle fibers

Hypertrophy

29

A decrease in muscle size may result from disuse or denervation

Atrophy

30

Group of inherited muscle destroying diseases most common in males

Muscular dystrophy

31

Point of contact between neuron and muscle fiber

Neuromuscular junction

32

Gap between cells

Synaptic cleft

33

Chemicals that relay messages to effectors

Neurotransmitter

34

Store neurotransmitters

Synaptic vesicles

35

Region of scarcolemma containing neurotransmitter receptors

Motor end plate

36

Acetylcholine (Ach) releved from synoptic vesicles into synoptic cleft- Ach binds to Ach receptors on moror end of plate opening sodium ion channels -muscle with potential (MAP) is produced as Na+ flows into muscle cell making it more positively charged

Nerve impulse excite skeletal muscle fibers 3 steps

37

In sarcoplasm starts contraction

Increased Ca2+ levels

38

Bonds to troponin, uncovering actin binding sites for myosin

Ca2+

39

Pulls on actin causing contraction cycle (shortening)

Myosin

40

ATP breakdown energizes myosin head

Contraction cycle step 1

41

Long striated fibers attached to bones and volantary control

Skeletal Muscle tissue