Deck 12: Introduction to the Muscular System: Muscle Tissue

Question 1

Which labeled structure is the muscle fiber?

A)A
B)B
C)C
D)D

Answer 1

C

Question 2

Which labeled structure is the epimysium?

A)F
B)E
C)C
D)D

Answer 2

A

Question 3

What does the perimysium surround?

A)Single muscle cell
B)Single fascicle
C)Single sarcomere
D)Entire muscle

Answer 3

B

Question 4

Which labeled structure is the sarcolemma?

A)E
B)F
C)G
D)D
E)See Word doc, there is no choice E

Question 5

Acetylcholine is released from the axon terminal of a motor neuron and it acts as ________.

A)an action potential
B)a catalyst
C)an inhibitory chemical
D)a neurotransmitter

Question 6

Which structure allows the action potential to travel deep into the interior of the cell to each contractile organelle?

A)Myofibril
B)T-tubule
C)Sarcolemma
D)Sarcoplasm

Question 7

An electromyogram is a visual representation of ________.

A)action potentials generated along sarcolemmas
B)transmission of acetylcholine
C)activity of a single motor unit
D)movement of charged ions out of the muscle cell

Question 8

The neuromuscular junction is found between which two structures?

A)Axon terminal of motor axon and T-tubule
B)Dendrite of motor neuron and sarcoplasm
C)Axon terminal of motor neuron and motor end plate
D)Cell body of motor neuron and myofibril

Question 9

Which labeled structure is the fascicle?

A)A
B)B
C)C
D)D

Question 10

What does the thick filament do during a muscle contraction?

A)Pulls on the thin filament
B)Blocks the actin active site
C)Stabilizes the Z-disc
D)Forms a stationary wall for the thin filament to pull against

Question 11

What does the epimysium surround?

A)Single muscle cell
B)Single fascicle
C)Bundle of 2-3 fascicles
D)Entire muscle

Question 12

Which labeled structure is the myofibril?

A)E
B)F
C)G
D)D

Question 13

Which labeled structure is the fascicle?

A)G
B)K
C)J
D)L

Question 14

The active sites on the actin filaments are exposed by ________.

A)potassium
B)acetylcholine
C)calcium
D)sodium

Question 15

Which part of the body has three electrodes placed on it for the EMG?

A)Ankle
B)Forearm
C)Hand
D)Chest

Question 16

Which description is true of skeletal muscle fibers?

A)They contain 1-2 nuclei.
B)They have faint or no striations.
C)They are branched.
D)They are long and cylinder shaped.

Question 17

Exposing skeletal muscle fibers to which substance disrupts the cells' troponin-tropomyosin complexes and prevents them from blocking the myosin binding sites on actin?

A)Glycerin
B)Calcium
C)Acetylcholine
D)Sodium

Question 18

What is the smallest functional unit of a muscle contraction?

A)Myofibril
B)Sarcomere
C)Myofilament
D)T-tubule

Question 19

Which labeled structure is the nucleus?

A)A
B)F
C)C
D)D

Question 20

Which structures form the boundaries of the sarcomere?

A)Thin filaments
B)Thick filaments
C)Z-discs
D)Triads

Question 21

Which of the following statements describes the microscopic appearance of skeletal muscle tissue?

A)The cells are branched.
B)The cells are long and striated.
C)The cells have one to two nuclei.
D)The cells are short and oblong shaped.

Question 22

The endomysium of a muscle fiber is composed of loose connective tissue while the perimysium is composed of dense irregular connective tissue. What can you conclude about the function of the endomysium versus the function of the perimysium based on the tissue differences?

A)The endomysium only needs to electrically insulate the muscle fiber.
B)The endomysium is under high levels of physical stress due to contraction of the muscle.
C)The endomysium is effective at separating muscle fascicles.
D)The endomysium only needs to form an electrical conduction pathway with the muscle fiber.

Question 23

What structure consists of myosin?

A)Thin filament
B)Thick filament
C)Endomysium
D)Perimysium

Question 24

In the sliding filament mechanism, which event occurs first?

A)Power stroke of the crossbridge
B)Binding of myosin to actin
C)Influx of calcium into the sarcoplasm
D)Influx of potassium into the sarcolemma

Question 25

What is an electromyograph?

A)Visual representation of action potentials moving along the sarcolemma
B)Transmission of a signal between a neuron and a skeletal muscle cell
C)A photograph of a skeletal muscle microscope slide
D)Graphic representation of infarcts occurring in a heart

Question 26

-Which muscle fiber type contains only a few mitochondria because it does not rely on aerobic respiration?

A)Slow oxidative (red)
B)Fast oxidative (pink)
C)Fast glycolytic (white)

Question 27

- The muscle fiber type marked with the number 2 uses ________ primarily to make ATP energy.

A)aerobic respiration
B)anaerobic respiration
C)fermentation

Question 28

Which lettered structure indicates the endomysium?

A)A
B)B
C)C
D)D

Question 29

Which lettered structure indicates the organelle responsible for making ATP energy?

A)E
B)F
C)H
D)I

Question 30

What might a stronger clench reading suggest?

A)Decrease in motor recruitment
B)Increase in motor recruitment
C)Exhaustion of calcium ions
D)Decreased frequency of nerve impulses delivered to the motor unit

Question 31

Which lettered structure would secrete acetylcholine?

A)A
B)B
C)C
D)D

Question 32

Explain the functional significance of the T-tubules of the sarcolemma and the terminal cisternae of the sarcoplasmic reticulum.

A)The increased surface of both structures increases the speed and efficiency with which the end-plate potential leads to sarcomere contraction.
B)The abundance of each structure increases the rate of ATP production.
C)The T-tubules and terminal cisternae enhance the chemical attraction between myosin and actin.
D)The increased surface area provides space for more ligand gated ion channels, thus increasing the effectiveness of acetylcholine binding.

Question 33

What will glycerin do to skeletal muscle fibers?

A)Adhere myosin heads to actin active sites
B)Block actin active sites
C)Remove ions and ATP so actin active sites are exposed
D)Increases calcium permeability

Question 34

What is the main component of the A band of the myofibril?

A)Elastic filaments
B)Actin filaments
C)Thin filaments
D)Thick filaments

Question 35

Which structure stores calcium?

A)Mitochondrion
B)T-tubule
C)Thin filament
D)Sarcoplasmic reticulum

Question 36

What is the region of the sarcolemma across from the axon terminal at the neuromuscular junction?

A)Motor end plate
B)Triad
C)Transverse tubule
D)Fascicle

Question 37

Which lettered structure marks the axon terminal?

A)A
B)B
C)C
D)D

Question 38

Based on your knowledge of the microscopic anatomy of muscle tissue, how would you conclusively identify cardiac muscle tissue from a cross-sectional view?

A)I would confirm the presence of a single, centrally located nucleus in the cells.
B)I would confirm the presence of a single, peripherally located nucleus in the cells.
C)I would confirm the absence of stippling (i.e., many, small dots)in the sarcoplasm of the cells.
D)I would confirm the absence of a multiple, peripherally located nuclei in the cells.

Question 39

-Which muscle fiber type contains very few blood capillaries?

A)Slow oxidative (red)
B)Fast oxidative (pink)
C)Fast glycolytic (white)

Question 40

Which lettered structure indicates the terminal cisternae of the sarcoplasmic reticulum?

A)A
B)D
C)F
D)E

Question 41

Predict the effect of adding ATP and ions to the H-band of glycerinated muscle fibers.

A)The H-zone would narrow.
B)The H-zone would widen.
C)The H-zone stays the same.

Question 42

Explain why an abundance of mitochondria in slow-oxidative fibers is correlated with an abundance of capillaries.

A)Increased delivery of oxygen is needed for sustained ATP production.
B)They are both needed to produce the color of the slow-oxidative fibers.
C)Myosin ATPase needs increased ATP production.
D)Large diameter fibers enable more room for mitochondria, which in turn require more capillaries.