ch.10 muscle tissue

Question 1

What are the three muscle types?

Answer 1

• Skeletal
• Cardiac
• Smooth

Question 2

Is Skeletal muscle involuntary or voluntary?

Answer 2

Voluntary

Question 3

Is cardiac muscle voluntary or involuntary?

Answer 3

Involuntary

Question 4

Is smooth muscle involuntary or voluntary?

Answer 4

Involuntary

Question 5

What is auto rhythmic?

Answer 5

Automatic. Able to generate an action potential without external stimulation by nerve cells.

Question 6

What muscle type(s) are auto rhythmic?

• Smooth
• Skeletal
• Cardiac

Answer 6

Smooth and Cardiac muscles

Question 7

Muscle cells specialize in what?

Answer 7

Contractions

Question 8

What does each organ or muscle consist of?

Answer 8

Skeletal muscle tissue, nerves, blood vessels, and connective tissue

Question 9

What are the functions of a skeletal muscle?

Answer 9

Movement
posture
Guard entrances and exits of the urinary and digestive systems 
Protect and support
produces heat
store nutrients

Question 10

What is in a muscle organ?

Answer 10

Muscle fiber and muscle fascicle

Question 11

Where are muscle fibers found?

Answer 11

Inside the muscle fascicle

Question 12

Where are muscle fascicles found?

Answer 12

Muscle fascicles are found in the skeletal muscle

Question 13

What is a muscle fascicle?

Answer 13

A bundle of cells

Question 14

What are the three layers of connective tissue in a skeletal muscle?

Answer 14

Epimysium
Perimysium
Endomysium

Question 15

What is the perimysium?

Answer 15

Surrounds the muscle fascicles and contains blood vessels and nerves

Question 16

What is the Endomysium?

Answer 16

Surrounds individual muscle cells (fibers) within the fascicle

Question 17

What is epimysium?

Answer 17

Surrounds the entire skeletal muscle and it contains a dense layer of collagen fibers.

Question 18

What is the plasma membrane of a muscle cell?

Answer 18

Sarcolemma

Question 19

What is sarcoplasm?

Answer 19

Cytoplasm of the muscle cell

Question 20

What are myofibrils?

Answer 20

Bundles of protein filament

Question 21

What do myofibrils contain?

Answer 21

thick and thin filaments

Question 22

What are thick filaments composed of?

Answer 22

Myosin

Question 23

What are thin filaments composed of?

Answer 23

Actin

Question 24

What do myofibrils do?

Answer 24

Responsible for muscle contractions and movement

Question 25

What does sarcolemma develop?

Answer 25

Develops a membrane potential due to active transport of ions

Question 26

What is a membrane potential charge?

Answer 26

-70mV

Question 27

What does -70mV mean?

Answer 27

Muscle is at rest

Question 28

What are t-tubules?

Answer 28

Narrow tubes that are continuous with the sarcolemma

Question 29

What is sarcoplasmic reticulum?

Answer 29

A membrane complex related to the endoplasmic reticulum. It forms a tubular network around each myofibril Muscle contraction occurs when calcium in the sarcoplasmic reticulum is released into the sarcoplasm.

Question 30

What happens to calcium in the sarcoplasmimc reticulum when muscles contract and relax?

Answer 30

Calcium is released for contraction and returns when relaxed

Question 31

What is a sarcomere?

Answer 31

A functional repeating unit in the myofibril

Question 32

What causes the dark and light color difference in sarcomeres?

Answer 32

Protein density

Question 33

What does the a band consist of?

Answer 33

The thick filaments in the center of the sarcomere

Question 34

What is the m line?

Answer 34

The central portion of the thick filaments (the middle)

Question 35

What is the h-zone?

Answer 35

The light region of the sarcomere structure | Contains only thick filaments

Question 36

What is the zone of overlap?

Answer 36

The overlap of thick and thin filaments

Question 37

What does the I band contain?

Answer 37

Thin but not thick filaments

Question 38

What does the z line mark?

Answer 38

The boundary of the sarcomere

Question 39

What proteins does the thin filaments contain?

Answer 39

Actin, tropomyosin, troponin

Question 40

What proteins does the thick filaments contain?

Answer 40

Myosin

Question 41

What do myosin heads do?

Answer 41

what causes contractions by pulling actin (found in the z line) inward.

Question 42

When the muscle fiber contracts, the I bands get what?

Answer 42

Smaller

Question 43

When the muscle fibers contract the zones of overlap get what?

Answer 43

larger

Question 44

When the muscle fiber contracts the z line gets what?

Answer 44

Closer together

Question 45

When the muscle fiber contracts the width of A band gets what?

Answer 45

Remains constant

Question 46

What signals muscles to contract?

Answer 46

Action Potential (electrical impulses)