BIOL 2001 Lecture Notes - Lecture 8: Myocyte, Sarcomere, Myofibril
23 Feb 2016
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Document Summary
Power most functions including locomotion, ingestion, circulation, movement of food through the digestive tract, and respiration. Responsible for voluntary movement of the body and involuntary bodily activities. The action is always to contract and by doing so it generates the mechanical forces needed for movement. Consume a large proportion of the energy used by an animal. Activity is a response to input from the nervous system. Arranged in antagonistic pairs that function together to move the skeleton. Primarily function to transfer force between skeletal muscles and bones. More elastic than bone (can stretch 6% of total length) Can store energy during contraction and release energy during recoil. Muscles attach to bones via tendons o o o o. Ligaments are tendon like structures that connect bones o. Characterized by a hierarchy of smaller and smaller units o. Muscle -> group muscle fibers -> muscle fiber -> myofibril -> sarcomere -> actin and myosin.
