LIFESCI 2 Lecture Notes - Lecture 13: Sliding Filament Theory, Muscle Fatigue, Creatine Supplements
Document Summary
Musculoskeletal systems: muscles, when muscles work, they do two things: contract & produce force a. i. Overall main purpose: produce force: muscles are excitable cells b. i. Similar but not identical to neurons: overall effect of action potential in neuron: release of neurotransmitters, overall effect of action potential in muscle: force production. Neural pathway: muscles respond to neurons, sensation on skin receptors sensory neurons interneurons motor neurons effector muscles. 3 types: smooth (involuntary), cardiac (involuntary), skeletal (voluntary) Found around organs like the stomach & smooth intestine. Voluntary can move it constantly: muscles we use for movement. Muscle: each muscle in the body is classified as an organ, made of multiple bundles of called fascicles. Fascicles: made of multiple cells that are made of muscle fibers. Has all the same parts are regular cells a. ii. Only difference is that their function is to contract, so they"re made of proteins that interact to create force: made of many myofibrils.
