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Lab exercise 13

Matching
 
 
Matching. Use the items in the key to correctly identify the structures described below.
a.
endomysium
g.
perimysium
b.
epimysium
h.
sarcolemma
c.
fascicle
i.
sarcomere
d.
fiber
j.
sarcoplasm
e.
myofibril
k.
tendon
f.
myofilament
 

 1. 

connective tissue ensheating a bundle of muscle cells
 

 2. 

bundle of muscle cells
 

 3. 

contractile unit of muscle
 

 4. 

a muscle cell
 

 5. 

thin reticular connective tisue investing each muscle cell
 

 6. 

plasma membrane of the muscle fiber
 

 7. 

a long filamentous organelle with a banded appearance found within muscle cells
 

 8. 

actin- or myosin-containing structure
 

 9. 

cord of collaen fibers that attaches a muscle to a bone
 
 
Matching. Match the choices from the corresponding questions below. Choose the best answer.
a.
Aponeurosis
c.
Both
b.
Tendon
 

 10. 

a sheet of white fibrous connective tissue
 

 11. 

a band or cord of the same tissue
 

 12. 

attach muscles to bones or to other muscles
 
 
Matching. The diagram illustrates a small portion of a muscle myofibril. Match the letters in the diagram with the corresponding questions below.

l13_files/i0160000.jpg
 

 13. 

A band
 

 14. 

actin filament
 

 15. 

I band
 

 16. 

myosin filament
 

 17. 

sarcomere
 

 18. 

Z disc
 
 
Matching. Match the letters on the diagram with the corresponding questions below.
l13_files/i0230000.jpg
 

 19. 

Endomysium
 

 20. 

Muscle cell
 

 21. 

Perimysium
 

 22. 

Fascicle
 

 23. 

Tendon
 

 24. 

Epimysium
 
 
Matching. The diagram illustrates a small portion of several myofibrils. Match the letters on the diagram with the corresponding questions below.
l13_files/i0300000.jpg
 

 25. 

A band
 

 26. 

actin filament
 

 27. 

I band
 

 28. 

myosin filament
 

 29. 

T tubule
 

 30. 

terminal cisterna
 

 31. 

triad
 

 32. 

sarcomere
 

 33. 

Z disc
 
 
THE NEUROMUSCULAR JUNCTION
Completer the following statements:

The junction between a motor neuron’s axon and the muscle cell membrane is called a neuromuscular junction or a __(a)__ junction. A motor neuron and all of the skeletal muscle cells it stimulates is called a __(b)__. The actual gap between the axon terminal and the muscle cell is called a __(c)__. Within the axon terminal are many small vesicles containing a neurotransmitter substance called __(d)__. When the __(e)__ reaches the ends of the axon, the neurotransmitter is released and diffuses to the muscle cell membrane to combine with receptors there. The combining of the neurotransmitter with the muscle membrane receptor causes the membrane to become permeable to both sodium and potassium. The greater influx of sodium ions results in __(f)__ of the membrane. The contraction of the muscle cell occurs. Before a muscle cell can be stimulated to contract again, __(g)__ must occur.
 

 34. 

motor unit
 

 35. 

acetylcholine
 

 36. 

myoneural
 

 37. 

nerve impilse (action potential)
 

 38. 

synaptic cleft
 

 39. 

depolarization
 

 40. 

repolarization
 
 
Matching. The events that occur at a neuromuscular junction are depicted below. Match the letters on the diagram with the corresponding questions below.
l13_files/i0480000.jpg
 

 41. 

T tubule
 

 42. 

synaptic vesicle
 

 43. 

synaptic cleft
 

 44. 

axon terminal
 

 45. 

mitochondrion
 

 46. 

myelinated axon
 

 47. 

sarcolemma
 



 
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