Muscle and the cytoskeleton

Question 1

What controls the mechanically contractile machinery of the specialized muscle cells?

Answer 1

Signal transduction pathways where the 2nd messenger Ca2+ plays pivotal role.

Question 2

What muscles are striated?

Answer 2

Cardiac and skeletal

Question 3

What muscle is devoid of striations?

Answer 3

Smooth (allows it to contract in all directions)

Question 4

What muscles are involuntary?

Answer 4

cardiac and smooth

Question 5

What muscles are voluntary/

Answer 5

Skeletal

Question 6

What is sarcolemma/

Answer 6

Excitable plasma membrane

Question 7

What is found within each individual muscle fiber ?

Answer 7

Bundles of parallel myofibrils

Question 8

what are myofibrils composed of?

Answer 8

interdigitated, overlapping thick and think filaments

Question 9

how would A bands look in electron microscopy? I bands?

Answer 9

Dark, light

Question 10

What is the central region of A band?

Answer 10

h band (consists of only thick filaments)

Question 11

What is the region between the 2 Z lines?

Answer 11

Sarcomere