muscle physiology/muscle energy

Question 1

cross bridge formation

Answer 1

signal comes from motor nerve activating the fibre > the heads of the myosin filaments attach themselves to actin filaments

Question 2

cross bridge movement

Answer 2

myosin attaches to actin, pulls along, then detaches and repeats to shorten sarcomere

Question 3

cross bridges

Answer 3

overlapping of actin and myosin

Question 4

fewer cross bridges can form/sarcomeres too close together =

Answer 4

less force produced

Question 5

sarcoplasmic reticulum

Answer 5

labyrinth of tubules inside of fiber

Question 6

T-tubules (transverse tubules)

Answer 6

connect sarcoplasmic reticulum with outer membrane (sarcolemma)

Question 7

connective tissue

Answer 7

comprised of protein collagen surrounds all myofibrils, muscle fiber and muscle fiber bundles

Question 8

neural impulse/action potential

Answer 8

electrical currents that pass along nerve fibers

Question 9

motor unit

Answer 9

each motor nerve supplies nerves to many muscle fibers

Question 10

synapses

Answer 10

impulses crossing gaps between adjoining nerves

Question 11

motor end plate

Answer 11

impulses cross gap to innervate muscle

Question 12

acetylcholine