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Protects organism form the outside, includes clams and snails, calcium containing shells.
Simplest type of skeleton, fluid constrained by flexible tissue, includes jellyfish and worms.
Functions of bones
Support and protection, supply of calcium and other minerals, aid in movement, blood cell formation.
Consists of moveable bones joined by a fluid-filled capsule of fibrous connective tissue.
Runs the length of a muscle cell, contractile bundle that consists of thin and thick filaments.
Sliding filament model
A muscle fiber contracts when thin filaments slide within thick filaments. The sarcomere shortens. Heads of myosin interact with actin forming a cross-bridge.
Muscle movement process
Motor neuron conveys message to muscle cell to contract.
Motor neurons release neurotransmitters.
Receptors on muscle bind to neurotransmitter.
Neurotransmitters to endoplasmic reticulum to release calcium (Ca2+).
Calcium binds to protein on actin and allows interaction with myosin.
Slow twitch fibers
Long duration contractions.
Capillaries have good supply of oxygen.
Fast twitch fibers
Short duration contractions.
Short term use for strength.
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