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1

(3)  types of muscular tissue 

skeletal

cardiac

smooth

2

skeletal muscle 

moves?

striated?

voluntary/involuntary?

moves bones

striated 

works in voluntary manner  but also controlled subconsciously 

 

3

Cardiac Muscle

found where?

striated? 

voluntary/involuntary action?

found only in walls of the heart

striated

involuntary 

4

Smooth Muscle

located?

striated? 

involuntary/voluntary action?

located in walls of hollow internal structure (blood vessels, airways & many organs)

lacks striations

usually involuntary

5

Functions of Muscular Tissue (4) 

1) producing body movements 

2) stabilizing body positions 

3) moving substances within body

4) generating heat

6

Properties of Muscular Tissue (4) 

1) electrical excitability

2) contractibility

3) extensibility (stretch)

4) Elasticity (can return to normal length) 

7

Skeletal Muscle Tissue

connective tissue components 

Fascia

Epimysium 

Perimysium 

Endomysium 

8

Fascia

 Dense sheet or broad band of irregular connective tissue that surrounds muscles 

9

(3) layers of connective tissue extend from fascia to protect & strengthen skeletal muscle

1) Epimysium

2) Perimysium

3) Endomysium

10

1) Epimysium

 The outermost layer of dense irregular connective tissue 

circles entire muscle

11

2) Perimysium

Separates 10-100 muscle fibers into bundles called fascicles

 

12

3) Endomysium

penetrates interior of each fasicle & seperates individual muscle fibers from one another (mostly reticular fibers)

13

Tendon

cord that attached muscle to a bone

14

Aponeurosis

connective tissue elements extend as broad flat sheet 

(broad flattened tendon)

15

Neurons that stimulate skeletal muscle to contract are ____________motor neurons 

The axon of a somatic motor neuron typically ____________many times, with each ___ extending to a different skeletal muscle fiber 

somatic

branches

branch

16

The ____________of skeletal muscle fibers is set before you are born 

(most of these cells last a lifetime) 

number

17

Muscle growth occurs by?

muscular hypertrophy - an enlargement of existing muscle fibers

18

What can stimulate hypertrophy?

Testosterone Human Growth Hormone 

19

what cells  retain the capacity to regenerate damaged muscle fibers ?

satellite cells

20

The plasma membrane of a muscle cell 

sarcolemma

21

Tiny invaginations of sarcolemma

Tunnel in from the plasma membrane

Muscle action potentials travel through 

Transverse (T Tubules)

22

 the cytoplasm of a muscle fiber 

 includes glycogen used for synthesis of ATP and a red-colored protein called  ____ which binds oxygen molecules 

Sarcoplasm

 

Myoglobin

23

Myoglobin & oxygen?

protein that binds oxygen and releases it when it is needed for ATP production

24

 Thread like structures within the sarcoplasm which have a contractile function 

myofibrils

25

membranous sacs which encircles each myofibril

Sarcoplasmic reticulum

26

dilated end sacs that butt against T-tubules from both sides 

 Stores calcium ions (Ca++) 

& releases to trigger muscle contraction

terminal cisterns of

Sacoplasmic Reticulum

27

(myo)filaments 

smaller protein structures within myofibrils that function in the contractile process 

thin and thick

(2 thin for every thick)

28

 

compartments of arranged filaments 

basic functional unit of a myofibril

 

Sarcomeres

(extend from one Z disc to another) 

29

Narrow plate-shaped region of dense protein material 

 Separate one sarcomere from the next

 

Z discs

30

Thick and thin filaments overlap one another but the extent of overlap depends on?

whether muscle is contracted, relaxed or stretched