Exam 2

Question 1

Mesenchymal cells

Answer 1

Start muscle development; differentiate into myoblasts

Question 2

Myoblasts

Answer 2

Fuse to form skeletal muscle fibers; why skeletal muscle is multinucleated

Question 3

Satellite cells

Answer 3

Differentiate from myoblasts; retain the ability to proliferate and produce and differentiate into new myocytes upon injury.

Question 4

Myocytes

Answer 4

Muscle cells; made up of myofilaments and protein; allow for contraction of the cell; have abundant mitochondria for the high ATP requirement during muscle contraction

Question 5

Myofibrils

Answer 5

Cylindrical bundles of thick and thin myofilaments; made up of a chain of sarcomeres (the region of one Z line to the next); collectively give rise to the transverse striations when viewed longitudinally.

Question 6

Muscle fibers

Answer 6

Made up of several myofibrils; actual muscle cell or myocyte; surrounded by endomysium

Question 7

Muscle fascicle

Answer 7

Group of muscle fibers; surrounded by perimysium

Question 8

Endomysium

Answer 8

Thin layer of CT that surrounds each individual muscle cell; resembles the basal lamina in epithelium

Question 9

Perimysium

Answer 9

Thin layer of CT that surrounds each fascicle

Question 10

Epimysium

Answer 10

Dense layer of CT that surrounds the entire muscle formed by groups of fascicles