BIO 325 Lecture Notes - Lecture 9: Exocytosis, Troponin, Aqueous Solution
Document Summary
5% inorganic and organic compounds: voluntary (controlled by nervous system, striated and extrafusal. Protein found in skeletal and heart muscle. Stores oxygen and iron in the muscle: sarcotubular system. Both allow for uptake and regulation of intracellular calcium, release during contraction, and storage during muscle relaxation. Sarcoplasmic reticulum: involved in calcium transports that initiatives muscle contraction at the sarcomere: composed of tubules that run parallel to myofibrils called sarcotubular. Transverse tubules: run across the sarcoplasm and communicate with extracellular space: myofibrils. Contains sarcomeres and the speed at which sarcomeres lengthen and shorten are directly influencing the strength and function of skeletal muscles. One sarcomere is divided into: i band: z bands separate sarcomeres, aband: h band and m line, fascia. Three part connective tissue framework that encases muscles. Provide structure for a network of nerve fibers, blood vessels, and lymphatic channels.
