Presentation on theme: "Skeletal Muscle Contraction _________________-a motor neuron and all the muscle fibers it supplies When a motor neuron ________(transmits an ____________."— Presentation transcript:
Skeletal Muscle Contraction _________________-a motor neuron and all the muscle fibers it supplies When a motor neuron ________(transmits an ____________ ___________), all the muscle fibers involved respond by ___________. ___________ ___________the response of a muscle to a single brief threshold ___________; muscle reacts ___________and then ___________ __________ ____________variation in the degree of muscle contraction – ___________changes – Strength of ___________
Skeletal Muscle Contraction ___________and ___________Contractions – ___________-muscle changes in ___________ (decreasing the ______ at the joint) and moves the load; ___________remains constant – ___________-tension continues to ___________to the muscle’s peak ___________- producing capacity, but the muscle neither ___________nor ___________; moving a load ___________ than the muscle can handle
Cardiac Muscle Occurs only in the ___________where it constitutes the bulk of the ___________walls. It is ___________ ___________ Typically the muscle moves at a ___________rate. Contraction is similar to ___________muscle contraction. Not as _______as skeletal muscles cells and often are ___________cells. May be ___________or ___________. In either case the nuclei are located ___________in the cell. contain ___________discs
Smooth Muscle Found in the walls of ___________ ___________organs (stomach, bladder) ___________ Contractions are ___________and ___________
Smooth Muscle- Microscopic _________________________________- they are _______ in the middle and ___________to almost a point at both ends One ___________located nucleus Lacks the extensive ___________ ___________found in skeletal muscle There are two layers of smooth muscle that are typically present ___________-the alternating ___________and ___________of these opposing layers _______ substances in the lumen and ___________them through the organ’s internal pathway; helps ___________of contents.
Smooth Muscle- Microscopic ___________ ___________is less developed than that of the skeletal muscle ___________- pouchlike infoldings that enclose bits of ___________and allow high and low concentrations of ______to be seized close to the membrane.
Smooth Muscle- Microscopic How the organization of myofiliments are different from that of skeletal muscle: The ratio of ______is much lower to that of _______ ___________is associated with the actin filaments, but no ___________complex is present The _______ and _________ are arranged ___________within the cell, so they appear to ________ down; contraction is ___________ in manner
Smooth Muscle- Microscopic Smooth Muscle fibers contain longitudinal ___________of ___________ filaments that resist tension. These attach to dark staining dense bodies at regular intervals. ___________ - anchor to ___________; when found at the ___________surface also bind the muscle cell to connective tissue (___________), which transmits the pulling force to the surrounding ___________ tissue.