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Ch. 4 Part 4
Muscular tissueNervous tissue
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Muscular Tissue
• Consists of muscle fibers that can use ATP to generate force
• Function: produces body movements, maintains posture, and generates heat, provides protection
• 3 types– Skeletal– Cardiac– Smooth
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Skeletal Muscle Tissue
• Usually attached to bones• Striated – alternating light and dark bands
within fibers• Voluntary – can be made to contract and relax
under conscious control• Muscle fiber is cylindrical and has many nuclei
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Skeletal Muscle Tissue
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Cardiac Muscle Tissue
• Forms most of the wall of the heart• Striated• Involuntary – contraction is not consciously
controlled• Fibers are branched and have only one
nucleus (sometimes two)• Attached by intercalated discs with gap
junctions and desmosomes
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Cardiac Muscle Tissue
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Smooth Muscle Tissue
• Located in the walls of hollow internal structures like: blood vessels, airways to lungs, stomach, intestines, gallbladder, urinary bladder
• Nonstriated• Involuntary• Fiber is long, fat in the middle, and thin at the
ends
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Smooth Muscle Tissue
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Checkpoint
• Which muscles are striated and which are smooth?
• Which types of muscular tissue have gap junctions?
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Nervous Tissue
• Consists of neurons and neuroglia• Neurons (nerve cells) create electrical signals
called action potentials (nerve impulses)• Send impulses to other cells of the body• Neurons have 3 basic parts– Cell body– Dendrites– Axon
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Nervous Tissue