Lecture 5: Muscle Flashcards Preview

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Flashcards in Lecture 5: Muscle Deck (10)
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1
Q

The layer of connective tissue that surrounds muscle fascicles is ________________ that is made of _________________ .

a. Epimysium; dense irregular CT
b. Perimysium; dense irregular CT
c. Endomysium; dense irregular CT
d. Perimysium; loose irregular CT

A

b. Perimysium; dense irregular CT

2
Q

Skeletal muscle develops:

a. From myoepithelial cells
b. From epidermal precursors
c. From myoblasts
d. From a multinucleate cell

A

c. From myoblasts

3
Q

Type IIb fibers:

a. Have low myoglobin content
b. Have high myoglobin content
c. Have high mitochondria content
d. Have slower twitch

A

a. Have low myoglobin content

4
Q

In a sarcomere, thick filaments are linked by ____________ proteins of the _____________ .

a. a actinin and desmin; Z line
b. a actinin and desmin; M line
c. myomesin; Z line.
d. myomesin; M line.

A

d. myomesin; M line.

5
Q

The ion that is released by ACh at the NMJ to initiate a contraction is _____________.

a. Na+
b. Ca++
c. K+
d. Cl-

A

a. Na+

6
Q

The ion that triggers troponin movement of tropomyosin to create cross bridges is:

a. Na+
b. Ca++
c. K+
d. Cl-

A

b. Ca++

7
Q

Afferent receptors in muscle fibers are called:

a. Motor end fibers
b. Golgi organs
c. Muscle spindles
d. Ruffini corpuscles

A

c. Muscle spindles

8
Q

The junctions that make an intercalated disk are:

a. desmosomes
b. adherence junctions
c. gap junctions
d. all of the above

A

d. all of the above

9
Q

When a skeletal muscle fiber contracts,

a. the H bands and I bands get smaller.
b. the zones of overlap get smaller.
c. the Z lines get further apart.
d. the width of the A band narrows.

A

a. the H bands and I bands get smaller.

10
Q

Which of the following statements about smooth muscle contraction is TRUE?

a. Smooth muscle myosin has exactly the same arrangement of heads as skeletal muscle actin
b. Smooth muscle contracts using dense bodies
c. Smooth muscle actin uses ADP as a fuel source
d. Smooth muscle uses troponin

A

b. Smooth muscle contracts using dense bodies