Histo- Muscle Tissue

Question 1

Three types of muscle tissue

Answer 1

Skeletal, Cardiac and Smooth

Question 2

The ability of muscle tissue to respond to stimuli and produce electrical events is this characteristic

Answer 2

Excitability

Question 3

The ability of muscle tissues to generate force or tension is this characteristic

Answer 3

Contractability

Question 4

The ability of muscle tissue to be stretched is this characteristic

Answer 4

Extensibility

Question 5

Is extensibility passive or non passive?

Answer 5

Passive

Question 6

The ability of muscle tissue to return to its original length after being shortened or lengthened is this characteristic

Answer 6

Elasticity

Question 7

Functions of muscle tissue

Answer 7

Produce movement
Maintain posture
Stabilize joints
Generate heat

Question 8

Type of muscle tissue that is under voluntary control

Answer 8

Skeletal

Question 9

What is the arrangement of skeletal muscle?

Answer 9

Striated

Question 10

What is the appearance of skeletal muscle nuclei?

Answer 10

Peripheral and oval shaped, multi nucleated

Question 11

Involuntary muscle that acts upon the heart

Answer 11

Cardiac

Question 12

What is the appearance of cardiac muscle?

Answer 12

Elongated and branched cells joined by intercalated discs

Question 13

What join cardiac muscles to one another?

Answer 13

Intercalated discs

Question 14

What is the appearance of cardiac muscle nuclei?

Answer 14

Uni-nucleated cells with a centrally located nucleus

Question 15

Type of muscle tissue involved with involuntary control not in the heart

Answer 15

Smooth

Question 16

What is the arrangement of smooth muscle?

Answer 16

Nonstriated

Question 17

What type of cells does smooth muscle have?

Answer 17

Fusiform

Question 18

What is the orientation of the nucleus in smooth muscle?

Answer 18

Uninucleated, centrally located

Question 19

Type of muscle fiber that derives energy primarily from aerobic oxidative phosphorylation of fatty acids

Answer 19

Type I–Slow, Red Oxidative Fibers

Question 20

What is Type I-Slow, red oxidative fibers adapted for

Answer 20

Slow, continuous contractions over a long period of time, i.e. posture muscles

Question 21

What gives muscle fibers dark red color?

Answer 21

Myoglobin

Question 22

Type of muscle fiber that utilizes both oxadative metabolism and anaerobic glycolosis to produce energy?

Answer 22

Type IIa-Fast, Intermediate Oxadative-Glycolytic Fibers

Question 23

What are Type IIa - Fast, Intermediate Oxadative - Glycolytic fibers adapted for?

Answer 23

Rapid contractions and short bursts of energy.

Question 24

Type of muscle fiber that derives energy primarily via anaerobic glycolysis

Answer 24

Type IIb - Fast, White Glycolytic Fibers

Question 25

What gives muscle fibers a pale color?

Answer 25

Glycogen

Question 26

What are Type IIb - Fast, White Glycolytic fibers adapted for?

Answer 26

Rapid contraction, but they fatigue quickly

Question 27

Where is the sarcomere located on the myofibril?

Answer 27

from z disc to z disc

Question 28

What is the functional unit of a muscle?

Answer 28

Sarcomere

Question 29

Where is the A band located?

Answer 29

Between the I bands

Question 30

The thick myosin filament is this part of the sarcomere

Answer 30

All of the A band

Question 31

Part of the myofibril that is actin only

Answer 31

I band

Question 32

Part of the myofibril that is myosin only

Answer 32

H band

Question 33

This runs down the center of the H band

Answer 33

M line

Question 34

Muscle contraction happens because of this

Answer 34

Myosin pulls the Z discs toward the middle

Question 35

When thick and thin filaments start to slide past one another and the I band, H zone are narrower and shorter

Answer 35

Partially contracted muscle

Question 36

When the H zone and I band disappear and the sarcomere is at its shortest length

Answer 36

Fully contracted muscle

Question 37

Do the lengths of the thick and thin filaments change their length when they contract muscle?

Answer 37

No

Question 38

This wraps around the myofilament and blocks the myosin binding sites

Answer 38

Tropomysin

Question 39

This polymerizes to create F- Actin, the binding site for myosin

Answer 39

G- Actin

Question 40

This is composed of three sub units that are bound to tropomysin

Answer 40

Troponin complex

Question 41

One of these is the part of the troponin sub unit that binds to the tryptomysin

Answer 41

TnT

Question 42

Two of these is the part of the troponin sub unit that binds calcium that fuels the trigger for contraction

Answer 42

TnC

Question 43

What binds to the myosin heads

Answer 43

Actin and ATP

Question 44

What makes up the triad that is found around the myofibril?

Answer 44

1 T tubule and 2 terminal cisternae

Question 45

Conformational change of the terminal cisterna of the sarcoplasmic reticulum causes the release of this

Answer 45

Calcium

Question 46

A chemical synapse between a motor neuron and a skeletal muscle fiber

Answer 46

Neuromuscular junction

Question 47

The motor neuron and all the muscle fibers in innervates

Answer 47

Motor unit