Table 12.8

Question 1

Striated; actin and myosin arranged in sarcomeres

Answer 1

Skeletal muscle and cardiac muscle

Question 2

Moderately developed Sarcoplasmic reticulum and transverse tubules

Answer 2

Cardiac muscle

Question 3

Not striated; more actin than myosin; Actin inserts into dense bodies and cell membrane

Answer 3

Smooth muscle

Question 4

Poorly developed Sarcoplasmic reticulum; no transfers tubules

Answer 4

Smooth muscle

Question 5

Well developed sarcoplasmic reticulum and transverse tubules

Answer 5

Skeletal muscle

Question 6

Contains calmodulin, A protein that, when bound to calcium, activates the enzyme myosin light-chain kinase

Answer 6

Smooth muscle

Question 7

Contains troponin in the thin filaments

Answer 7

Cardiac muscle and skeletal muscle

Question 8

Calcium released into cytoplasm from sarcoplasmic reticulum

Answer 8

Skeletal muscle

Question 9

Calcium enters cytoplasm from sarcoplasmic reticulum and extracellular fluid

Answer 9

Cardiac muscle

Question 10

Calcium enter cytoplasm from extracellular fluid, sarcoplasmic reticulum, and perhaps mitochondria

Answer 10

Smooth muscle

Question 11

Can contract without nerve stimulation; action potentials originate in pacemaker cells of heart

Answer 11

Cardiac muscle

Question 12

Cannot contract without nerve stimulation; denervation results in muscle atrophy

Answer 12

Skeletal muscle

Question 13

Maintains tone in absence of nerve stimulation; visceral smooth muscle produces pacemaker potentials; denervation results in hypersensitivity to stimulation

Answer 13

Smooth muscle

Question 14

Muscle fibers stimulated independently; no gap junctions

Answer 14

Skeletal muscle

Question 15

Gap junctions present in most of these

Answer 15

Smooth muscle

Question 16

Gap junctions present as intercalated discs

Answer 16

Cardiac muscle