1in isometric contractions the load is to great to
move and the muscle generate tension as it attempts to shorten
2isotonic contraction
muscle shortens against a constant load which is moved
3isotonic contractions include
concentric and eccentric contraction
4skeletal muscle. fibers specialize for
endurance and speed
5in endurance fibers (type 1) the mitochondria gives fibers their red color. why?
their enzymes contain Fe and contain a red pigment (myoglobin) which stores O2
6how do type 1 endurance fibers contract
slowly but resist fatigue
7fast twitch fibers (type 2) specialized for fast contractions are (color)
white, containing few mitochondria
8what do fast twitch fibers rely on
glycosis to supply energy
9how do fast twitch fibers contract
rapidly but fatigue quickly
10what are the three processes where ATP is needed?
sending action potential out, releasing calcium ions, creating actin-myosin cross bridge