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Anatomy of Skin, Skeleton, and Muscle Complex

Discover the intricate structures of hair, sweat glands, muscle fibers, and more as they form the skin, skeleton, and muscles. Learn about the functions of different components like epidermis, nerve cells, and sarcomeres. Explore the roles of tissues such as adipose tissue and blood vessels in supporting movement and protection. Gain insights into muscle contraction, synaptic terminals, and motor units in the body. Unveil the mechanisms of muscle fibers, sarcomeres, and the spinal cord. Bring depth to your understanding of the anatomy and physiology of skin, skeleton, and muscles.

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Anatomy of Skin, Skeleton, and Muscle Complex

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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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