Bricklayers periodically need to carry heavy stacks of bricks from their truck to the work site, and they are quickly fatigued by this activity.An examination of the muscles used to perform this work would reveal
A) substantial fuel reserves.
B) low levels of ATPase activity.
C) an abundance of blood vessels.
D) relatively few mitochondria.
E) relatively high amounts of myoglobin.

Question

Quizplus · Accepted Answer

Relatively few mitochondria. Bricklayers require bursts of energy to lift and move heavy loads, but they do not need to sustain activity for long periods. As such, their muscles are adapted for anaerobic metabolism, which does not require mitochondria.

Bricklayers Periodically Need to Carry Heavy Stacks of Bricks from Their