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Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle

Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle. Fig. 40-11. Hair. Epidermis. Sweat pore. Muscle. Dermis. Nerve. Sweat gland. Hypodermis. Adipose tissue. Blood vessels. Oil gland. Hair follicle. Fig. 50-25a. Muscle. Bundle of muscle fibers. Nuclei.

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Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle

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  1. Chapter 38: Protection, Support, Movement: Skin, Skeleton, and Muscle

  2. Fig. 40-11 Hair Epidermis Sweat pore Muscle Dermis Nerve Sweat gland Hypodermis Adipose tissue Blood vessels Oil gland Hair follicle

  3. Fig. 50-25a Muscle Bundle ofmuscle fibers Nuclei Single muscle fiber(cell) Plasma membrane Myofibril Z lines Sarcomere

  4. Fig. 50-25b TEM 0.5 µm M line Thickfilaments(myosin) Thinfilaments(actin) Z line Z line Sarcomere

  5. Fig. 50-26 Sarcomere 0.5 µm M Z Z Relaxedmuscle Contractingmuscle Fully contractedmuscle ContractedSarcomere

  6. Fig. 50-30 Spinal cord Motorunit 1 Motorunit 2 Synaptic terminals Nerve Motor neuroncell body Motor neuronaxon Muscle Muscle fibers Tendon

  7. Fig. 50-29 Motorneuron axon Synapticterminal T tubule Mitochondrion Sarcoplasmicreticulum (SR) Myofibril Plasma membraneof muscle fiber Ca2+ released from SR Sarcomere Synaptic terminalof motor neuron Plasma membrane T Tubule Synaptic cleft ACh SR Ca2+ATPasepump Ca2+ ATP CYTOSOL Ca2+ ADP P i

  8. Fig. 50-27-4 Thick filament Thinfilaments Thin filament Myosin head (low-energy configuration ATP ATP Thickfilament Myosin binding sites Thin filament movestoward center of sarcomere. Actin ADP Myosin head (low-energy configuration Myosin head (high-energy configuration P i ADP ADP + P i Cross-bridge P i

  9. Fig. 50-28 Ca2+-binding sites Tropomyosin Actin Troponin complex (a) Myosin-binding sites blocked Ca2+ Myosin-binding site (b) Myosin-binding sites exposed

  10. Fig. 50-31 Tetanus Summation oftwo twitches Tension Singletwitch Time Actionpotential Series of actionpotentials athigh frequency Pair ofactionpotentials

  11. Fig. 40-5k Multiple nuclei Muscle fiber Sarcomere 100 µm Skeletal muscle

  12. Fig. 40-5l Nucleus Muscle fibers 25 µm Smooth muscle

  13. Fig. 40-5m Nucleus Intercalated disk 50 µm Cardiac muscle

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