key concept 47.1 Interactions of Actin and Myosin Cause Muscles to Contract
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Sliding filaments of actin and myosin cause skeletal muscle to contract
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Actinâmyosin interactions cause filaments to slide
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Actinâmyosin interactions are controlled by calcium ions
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Cardiac muscle is similar to and different from skeletal muscle
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Smooth muscle causes slow contractions of many internal organs
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key concept 47.2 Many Factors Affect Muscle Performance
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The strength of a muscle contraction depends on how many fibers are contracting and at what rate
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Muscle fiber types determine endurance and strength
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A muscle has an optimal length for generating maximum tension
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Exercise increases muscle strength and endurance
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Muscle ATP supply limits performance
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Insect muscle has the greatest rate of cycling
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key concept 47.3 Muscles and Skeletal Systems Work Together
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A hydrostatic skeleton consists of fluid in a muscular cavity
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Exoskeletons are rigid outer structures
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Vertebrate endoskeletons consist of cartilage and bone
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Bones develop from connective tissues
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Bones that have a common joint can work as a lever
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Apply What Youâve Learned
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