The area of the retina that lacks large blood vessels and is responsible for central vision is called the:
a. optic disk.
b. anterior chamber.
c. temporal retina.
d. macula.
Question 2
Dystrophin, the protein that is affected by muscular dystrophy, normally acts to
a. protect muscle fiber membranes during movement.
b. clear the interior of muscle fibers of excess calcium.
c. allow myosin and actin to interact during muscle contraction.
d. protect muscle spindles from too much stretching during movement.
