3 30 2020 - Muscle microanatomy PDF

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Summary

Muscle microanatomy
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Description

Muscle microanatomy Lab practical - Appendicular skeleton, girdle, something else function of muscles - Movement - Muscles for anyways moving - Heat generation - Maintain posture - Joint stability *when muscles for activated they shorten - Angle of joint gets longer or shorter Extension → angle getting longer Antagonistic muscles - Talking about two muscles that have completely different action about a joint How do muscles get longer? - Never on their own only with help from How are muscles activated? - Through the neuron system Muscles made up of three different tissues - Skeletal → control of how it looks - Smooth → tummy, digestive system - Cardiac → tissue of heart, not control Organization of skeletal tissues - Voluntary - You choose what you what to do - Striations - When muscle fibers are placed on top of each other the lines that separate - Tire most rapidly Skeletal muscle organization - Fascicle - Circle things - Fiber (cell) - Small circles inside fascicle - Myofibril

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Multiple nuclei Inside the fiber

Skeletal muscle contains CT sheaths - CT sheaths - Connective tissue that wraps around the muscle of the organ Epimysium - Connective tissue that sits directly on top of the muscle itself - Perimysium - Connective tissue that goes around the fascicle - Endomysium - Connective tissue that sits directly on top of the muscle fascicle Plasma membrane of muscles - Sarcolemma Cytoplasm of muscle - Sarcoplasm Smooth ER in muscles - Sarcoplasmic reticulum - Storing and releasing calcium - T tubules - Act as canals or tubes that go from the outside layer of the muscle fibers into the muscle Basic unit of skeletal muscle is the sarcomere Myosin → thick Actin → thin Z-disc → a vertical line that anchors all of the filaments together Sarcomere - All of the filaments from one z-disc to another z-disc...