PHGY 209 Lecture Notes - Lecture 4: Muscle Fatigue, Lactic Acid, Glycolysis
13 Dec 2017
School
Department
Course
Professor
Document Summary
These are designed to work strong in a short period of time. Glycolysis can generate atp rapidly, but it is not super-efficient. The muscle fatigues before the atp supply gets completely used, because if there is no more atp the muscle will freeze in a contraction state. The lactic acid that is released increases the ph of the fiber, which disturbs many things in the muscle, which makes it fatigue before the atp is completely used. These fibers do not generate a lot of force, but they work for a long period of time. These fibers have myoglobin, a molecules that binds to o2 and transfers the oxygen to mitochondria, making the use of o2 more efficient. Myoglobin has a red color, and therefore these muscles will appear more read. Muscles that do not have much myoglobin appear more white. That"s fro(cid:373) (cid:449)here (cid:272)o(cid:373)es the (cid:272)olor differe(cid:374)(cid:272)e i(cid:374) the (cid:272)hi(cid:272)ke(cid:374) for e(cid:454)a(cid:373)ple.
