BI SC 004 Lecture 21: BISC 004 Lecture 21
Document Summary
There are over 600 muscles in the human body. Muscles have important functions in relation to movement. Chemical signals are transmitted to stimulate muscle contraction. Motor unit: a nerve fiber and all of the muscle fibers it stimulates. Muscle twitch: a single contraction lasting a fraction of a second. Can split up into 3 different stages/phases. Summation: an increase in muscle contraction until the maximal sustained contraction is reached. No response: a continuous, partial contraction of alternate muscle fibers causing the muscle to look firm. Stored in the muscle: glycogen, fat. Creatine-phosphate pathway: simplest and most rapid way for muscle to produce atp, cp is only formed when muscles are resting. Glycolysis: one glucose molecule is broken down into pyruvic acid, occurs in the: Aerobic respiration: requires oxygen, takes place in the mitochondria, converts pyruvic acid into co2 and water, overall process:
