CAS BI 106 Lecture Notes - Lecture 9: Skeletal Muscle, Cellular Respiration, Red Color
Document Summary
Properties: excitability- responds to stimuli acts differently when stimulated, contractility- contracts/ tenses and to some extent the ability to stretch, elasticity- stretched and returns to original shape, extensibility- elongates. Skeletal muscles in action: contracting muscle cells takes a tremendous amount of energy, energy= atp, atp comes originally from glucose, anytime the muscle contraction rate increases, the amount of atp require is. In the process of glucose -> atp, oxygen is required, co2 is made, heat is lost increases and atp production increases. Oxygen intake also increases and co2 is exhaled. Muscles needs: calcium- intracellular messenger in contraction. Makes sure that all parts of muscle get the signal of contraction at the same time: bones serve as storage for calcium. Usually stored when your body doesn"t need it at the moment: once all the glucose is used up, body uses fat as area for glucose and energy, muscle cells can store their own glycogen and oxygen.
