Muscular Contraction

Question 1

Three types of contraction

Answer 1

isometric, eccentric, concentric

Question 2

Passive contraction

Answer 2

contraction of titin within muscles, like spring action to maintain proper overlapping of actin and myosin filaments

Question 3

Active force

Answer 3

the force of the filaments sliding past each other during the power stroke (main power of muscle)

Question 4

Total force

Answer 4

Sum of active and passive forces

Question 5

Clinical detection of muscle tear

Answer 5

elevated creatinine levels in the serum

Question 6

Duchenne disorder characterization

Answer 6

mutation in dystrophin; x-linked recessive

Question 7

Duchenne Pathophys

Answer 7

lack of dystrophin causes the glycoprotein matrix that supports the sarcomeres’ connection to the muscle membranes to be susceptible to degradation

Question 8

Amount of twitches done by stored ATP

Answer 8

8

Question 9

ATP in muscles used by

Answer 9

Na/K ATPase; Ca SR pump (ATP powered); actomyosin ATP-ase

Question 10

ATP replenishment

Answer 10

Creatine phosphate and ADP combine via action of creatine kinase to form ATP

Question 11

Energy use (order)

Answer 11

Actomyosin ATP-ase
S.R. Ca pump
Other metabolic functions

Question 12

fast twitch

Answer 12

glycogen containing (FG); appear white type IIb

Question 13

Slow twitch

Answer 13

many mitochondria = lots of myoglobin

slow/oxidative (SO) type I

Question 14

FOG

Answer 14

fast twitch with mitochondria and oxidative phospho. type IIa