Muscle Development

Question 1

Stem cells that develop into muscle cells

Answer 1

Myoblasts

Question 2

Once myoblasts form:

Answer 2

Groups of cells cluster together and fuse into one, large cell.

Question 3

How many myoblasts typically fuse into one muscle cell?

Answer 3

100s of cells

Question 4

the formation of myoblasts cause the new muscle cell to be:

Answer 4

multinucleate and long

Question 5

Are muscle cells mitotically active?

Answer 5

no

Question 6

During growth, muscle cells:

Answer 6

Grow in size but do not increase in number

Question 7

Hormones that control cell growth:

Answer 7

1) growth hormone
2) estrogen
3) testosterone
4) myostatin

Question 8

Purpose of myostatin

Answer 8

Limits muscle growth so that muscle size is appropriate

Question 9

What are satellite cells?

Answer 9

Myoblasts, present in adults, that remain at the edges of muscle cells for repair.

Question 10

Are satellite cells mitotically active?

Answer 10

yes

Question 11

Purpose of satellite cells:

Answer 11

“fill in” damaged muscle to repair it

Question 12

If damaged areas are large:

Answer 12

Connective tissue known as “scar tissue” will fill in the injury

Question 13

Proper name for scar tissue:

Answer 13

fibrosis