Question

question 7
1 pts
growth of the uterus during pregnancy is accomplished by________of its smooth muscle.
neither hypertrophy nor hyperplasia
both hypertrophy and hyperplasia
hypertrophy but not hyperplasia
hyperplasia but not hypertrophy
question 8
1 pts
the presence of mitochondria and myoglobin facilitate________respiration in muscle cells.
aerobic
anaerobic
question 9
1 pts
which fibers dominate many of the back and calf muscles that contract almost continually
to maintain posture?
slow-twitch

Explanation:

• Question 7: During pregnancy, the uterus grows. Hypertrophy is an increase in cell size, and hyperplasia is an increase in cell number. The uterus undergoes both as its smooth muscle cells increase in size (hypertrophy) and number (hyperplasia) to accommodate the growing fetus.
• Question 8: Mitochondria are the power - houses of the cell and are involved in aerobic respiration (which requires oxygen). Myoglobin stores oxygen. Together, they facilitate aerobic respiration in muscle cells. Anaerobic respiration does not rely on these oxygen - related structures in the same way.
• Question 9: Slow - twitch fibers are more resistant to fatigue. Muscles like those in the back and calf that need to contract almost continually (for posture) are dominated by slow - twitch fibers. Fast - twitch fibers are more for quick, powerful contractions.

Answer:

• Question 7: both hypertrophy and hyperplasia
• Question 8: aerobic
• Question 9: Slow - twitch