Muscle Histology (Msq Drill 202)

1. Are type 2A and 2B fibers slow twich or fast twitch?

Fast twitch

Slow twitch

2. Which type of muscle fibers are small and make up the neuromuscular spindle. These fibers are microscopic?

Intrafusal fibers

Extrafusal fibers

3. So, the presence of NADH transferase indicates oxidative capacity?

Yes

No

4. So, all of the ordinary muscle fibers outside of the spindle are known as intrafusal muscle fibers. True or false?

True

False

They are known as extrafusal. Intrafusal fibers are microscopic and make up the neuromuscular spindle.

Explanation

They are known as extrafusal. Intrafusal fibers are microscopic and make up the neuromuscular spindle.

5. Type 2A is therefore both glycolytic and oxidative. Is it fatigue resistant or fatigue sensitive?

Fatigue resistant

Fatigue sensitive

6. What is endomysium made up of?

Fibrous connective tissue

Fibrocartilaginous connective tissue

Hyaluronic acid

7. Groups of muscles fibers are termed:

Myofibrills

Fascicles

Corpuscles

8. The connective tissue capsule that separates or surrounds fascicles is known as the:

Epimysium

Perimysium

Endomysium

9. Which of the following muscles has a contractile behavior of: slow twitch?

Oxidative or type 1

Oxidative glycolytic or type 2A

Glycolytic or type 2B

10. Where do the large alpha motor neurons that innervate the extrafusal fibers come from?

Dorsal horn cells

Anterolateral horn cell

Anterior horn cells

11. Therefore, what is sensitive to the tension applied by muscle contraction on the tendon?

Golgi tendon organ

Gamma efferents

Type 1A sensory fiber

12. The epimysium surrounds an entire muscle. It is made up of a sheath which contains which three fibers?

Cartillagenous

Elastic

Collagenous

Reticular

Submit

13. Which of the following secretes the high concentration of hyaluronic acid that is found in the area between the deep fascia and the muscle?

Epimysium

Perimysium

Endomysium

14. Each muscle has a mixture of the different types of muscle fibers. True or false?

True

False

15. Do tendons intermingle with the three layers found in skeletal muscles?

Yes

No

16. The bundles in the perimysium run in opposite directions. True or false?

True, they run in opposite directions

False, they run in the same direction

17. Between type 2A and type 2B which one is glycolytic only?

Type 2A

Type 2B

18. The large alpha myelinated motor fibers innervate the:

Intrafusal muscle fibers

Extrafusal muscle fibers

19. So, the intrafusal fibers directly or indirectly measure the tension in the extrafusal fibers?

Directly

Indirectly

20. Does the intrafusal muscle fiber also measure the tension applied by muscle contraction on the tendon?

Yes, the intrafusal fibers measure tension in the extrafusal fibers and the tendon.

No, the intrafusal fibers do not measure the tension applied by the muscle contraction on the tendon.

21. Muscles are surrounded by deep fascia. What is this deep fascia composed of?

Densely packed collagen bundles and fibrous cartillage

Densely packed elastic bundles and a fibrous capsule

Densely packed collagen fibers and elastic fibers

Loosely packed collagen fibers and elastic fibers

Loosely packed collagen and a fibrous capsule

22. What is responsible for the MOTOR innervation of the intrafusal muscle fibers?

Small anterior horn cells

Alpha efferent neurons

Gamma afferents

Gamme efferents

Alpha afferent neurons

23. What does the area of the deep fascia that is adjacent to a muscle contain?

A high concentration of synovial fluid

A low concentration of synovial fluid

A high concentration of hyaluronic acid

A low concentration of hyaluronic acid

24. The muscle spindle has sensory receptor innervation that measures the tension state of:

Intrafusal muscle fibers only

Extrafusal muscle fibers only

Both intrafusal and extrafusal fibers

25. The golgi tendon organs provide information on the state of the tension in the tendons to the CNS or PNS?

CNS

PNS

26. Since the golgi tendon organs give feedback to the CNS, they are major determinants of organized coordinate muscle control and __________ .

Movement

Pain and temperature sensation

Vibratory sense

Propioception

27. Which of the following invests skeletal muscle?

Epimysium

Endomysium

Perimysium

28. If you stained a slow twitch or oxidative muscle fiber what enzyme would you find?

Aspartate dehydrogenase

Glutamate synthase

NADH dehydrogenase

NADH transferase

Formaldehyde dehydrogenase

29. Endomysium invests skeletal muscle. Which layers fills the spaces between muscle fibers?

Epimysium

Endomysium

Perimysium

To invest: to surround, to inclose

Explanation

To invest: to surround, to inclose