Muscular (part 1)

Question 1

The ability of muscle to return to its original length and shape after stretching is

Answer 1

Elasticity

Question 2

The type of connective tissue that covers a fascicle 

Answer 2

Perimysium

Question 3

The type of connective tissue that covers the entire muscle 

Answer 3

Epimysium

Question 4

Muscle Fiber is also known as

Answer 4

Myocyte
Myofiber
Muscle cell

Question 5

When a satellite cells is activated following muscle injury, it becomes a ____ before developing into a mature muscle cell 

Answer 5

Myoblast

Question 6

What is the difference between a muscle fiber and a myofibril?

Answer 6

Muscle fiber is a muscle cell and it contains many myofibrils

Question 7

The plasma membrane of a muscle cell

Answer 7

Sarcolemma

Question 8

Stores calcium ions and releases them during muscular contraction 

Answer 8

Sarcoplasmic reticulum

Question 9

The protein in muscle which stores oxygen and iron, similar to hemoglobin in blood 

Answer 9

Myoglobin

Question 10

What is not found in thin filaments

Answer 10

Myosin

What is:
Troponin
Tropomyosin
Actin

Question 11

Sarcomere

Answer 11

The region from Z disc to Z disc

Question 12

Thick filaments are found in

Answer 12

A band & H zone

Question 13

What shrinks and disappears as the muscle contracts? 

Answer 13

I band & H zone

Question 14

The fewer the fibers per motor unit

Answer 14

The more precise the movement

Question 15

What is the synaptic end bulb?

Answer 15

Nerve

Question 16

The neurotransmitter active at the neuromuscular junction 

Answer 16

Acetylcholine

Question 17

In relaxed muscle, ____ covers the ____-binding site found on ____

Answer 17

Tropomyosin
Myosin
Actin

Question 18

The protein whose heads move during the power stroke of muscle contraction

Answer 18

Myosin

Question 19

In muscle contraction, calcium ions move from the ____ to the ____

Answer 19

T tubules to the Sarcoplasmic reticulum

Question 20

Muscle achieves maximum tension or force at 

Answer 20

An intermediate length

Question 21

In terms of actin and myosin filaments, why is muscle weaker when it’s shorter than the optimal resting length?

Answer 21

Myosin bumps into Z discs, actin filaments overlap

Question 22

In terms of actin and myosin filaments, why is muscle weaker when it’s longer than the optimal resting length?

Answer 22

Too few cross-bridges

Question 23

Sustained muscle contraction with no twitches 

Answer 23

Fused tetanus

Question 24

A muscle contraction involving increasing tension with constant length

Answer 24

Isometric

Question 25

In terms of motor units, why don’t the postural muscles tire despite sustaining constant contraction? 

Answer 25

Some units always active, but each one alternates activity and rest 

Question 26

An inverse stretch reflex, ____ are activated, causing ____ in the muscle

Answer 26

Golgi tendon organs
Relaxation

Question 27

Muscle metabolism when oxygen is low, produces lactic acid and allows for two minutes of maximal activity 

Answer 27

Anaerobic glycolysis

Question 28

The energy source allowing the greatest length of maximal muscle activity 

Answer 28

Aerobic respiration

Question 29

The most common type of fatigue 

Answer 29

Psychological

Question 30

The most fatigue-resistant muscle fiber, found in long-distance runners and postural muscles 

Answer 30

Slow oxidative

Question 31

The muscle fiber type recruited last in the movement, to provide maximal force for a short duration 

Answer 31

Fast glycolytic

Question 32

A person under takes a weightlifting regimen. Overtime, what happens to muscle fiber size and muscle fiber number? 

Answer 32

Size increases, number stays the same

Question 33

Skeletal muscle

Answer 33

Greatest voluntary control 

Question 34

Cardiac muscle

Answer 34

Striated, considered involuntary 

Question 35

Smooth muscle

Answer 35

Most regeneration
Intermediate filaments, dense bodies
No striations
Found in blood vessels, airways, and hollow organs

Question 36

The function of an intermediate filament in a smooth muscle cell is most closely analogous to the function of a ____ on the gross anatomic level 

Answer 36

Tendon