Exam #3: True or false

Question 1

Endoplasmic reticulum is well-developed in muscle fibers

Answer 1

False

Question 2

Ribosomes are important to muscle cells and are well-developed

Answer 2

True

Question 3

Regulation of protein synthesis is of paramount importance to muscle cells’ response to exercise, stretch, injury, electrical stimulation, etc.

Answer 3

True

Question 4

Mitochondria are unconnected , discrete organelles

Answer 4

False

Question 5

Mitochondria make up about 15% of Type 1 muscle fiber area

Answer 5

False

Question 6

Nebulon is used for energy purposes in muscle fiber

Answer 6

True

Question 7

There is some evidence that myofibrils are arranged slightly like the weave of a rope

Answer 7

False

Question 8

The isomers of the heavy chains of the myosin modify speed of contraction

Answer 8

False

Question 9

Actin is found only in contractile muscle fibers

Answer 9

False

Question 10

As we grow older, our muscles tend to have a higher percentage of slow-twitch motor units because of a loss of fast-twitch motor units

Answer 10

True