Chapter 9 Muscular System Study guide

Sarcoplasmic Reticulum (SR)

E

T Tubules

C

I band

7

A band

6

Myofilaments

A

Myosin

4

M line

8

Sarcomere

1

H Zone

2

1

Tendon

Fascicle

2

Fiber

3

Myofibril

4

Endomysium

5

Perimysium

6

Epimysium

7

B

Mitochondria

Sarcolemma

D

Actin

3

Z line

5

Axon terminal

1

Vesicle

2

Synaptic cleft

3

Sarcolemma

4

Mitochondria

5

Acetylcholine

6

What are 3 functions of the muscular system?

1) produce movement

2) Maintain posture

3) Generate body heat

The ability of muscle tissue to get shorter and exert force is called:

contractility

The ability of muscle tissue to receive and respond to electrical stimulation is called

excitability

Dense, irregular, connective tissue separating muscles from each other and from the skin is

fascia

Connective tissue that surrounds a single muscle fiber is called

endomysium

After travelling along the sarcolemma, the action potential travels down the ___.

t-tubules

Witch model explains the physiology of muscle contraction?

Sliding Filament Model

Rigor mortis occurs because the muscle cells run out of ___ after death.

ATP

The energy source that is used directly for muscle contraction is ______.

ATP

what is the aerobic way in which muscles generate ATP

cellular respiration

Muscles are never 100% relaxed because they have _____, aiding in posture & supporting joints

muscle tone

What are some of the key features of type 1 slow fibers?

• Dark red in color due to lots of myoglobin

• good for endurance activities like swimming or long distance running

• associated with aerobic resperation

what are some of the key features of type 2a intermediate fibers?

• Fibers can increase in side

• pink in color due to medium amounts of myoglobin

• associated with aerobic resperation

What are some key features of type 2b fast fibers?

• fibers can increase in size

• white or pale in color due to lack of myoglobin

• used for explosive power and speed

• associated with glycolysis