BIOL 103 Lecture Notes - Myocyte, Sensory Neuron, Neuroglia
Document Summary
Assignment (connect quiz) due jan 27 on material from weeks one and two - complete. Because calcium is released but no atp is available for the myosin to let go of the actin filament. Muscle is made up of bundles of muscle fibers called fascicles. Fascicles are made up of myofirbril, which is made up of the microfilaments. H zone and i band shorten when muscles contract, a band remains unchanged. Adults cannot gain muscle fibres, only increase number of myofilaments in muscle fibres. Strength training: contracting muscles against resistance; increases microfilaments. Endurance training: increasing ability to sustain muscle contraction over a long period; increases number of blood vessels in a muscle and number of mitochondria in fibres. Disuse atrophy: a decrease in myofilaments in each muscle fibre. You have to exercise using specialized exercise equipment, because isometric exercises don"t work in space must get full range of motion.
