Ch 36 Musculoskeletal System . AP lecture. Three vertebrate muscles. Skeletal A.k.a striated Voluntary movements . Cardiac Involuntary Beating of the heart Appears striated because of myosin and actin Smaller than skeletal Cells attached by gap junctions . Smooth InvoluntaryBy Anita
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Contraction. Ca 2+. Ca 2+ pump. ACh. Na + /K + pump. Na +. K +. AChE. _. Ca 2+. Ca 2+ pump. ACh. Na + /K + pump. Na +. K +. AChE. _. Ca 2+. Ca 2+ pump. ACh. Na + /K + pump. Na +. K +. AChE. _. Ca 2+. Ca 2+ pump. ACh. Na + /K + pump. Na +. K +. AChE. _.
Excitation Excitation-contraction coupling Contraction Regulation of contraction Metabolism of contraction Smooth muscle. Excitation. Excitation-contraction coupling. dihydropyridine. ryanodine. Andrew HUXLEY 1953. TITIN. actinin. ACTIN.
Contraction Mechanism. Actin and myosin interact via to the sliding filament mechanism Resting State Actin bound by caldesmon Myosin light chain (MLC) dephosphorylated Intracellular [Ca 2+ ] low Rise in intracellular Ca 2+ triggers contraction
Contraction Twins. I am. I’m. It is. It’s. I will. I’ll. is not. isn’t. does not. doesn’t. has not. hasn’t. can not. can’t. we would. we’d. Can you think of any?.
More contraction! . Review Principles of Muscle Mechanics. Same principles apply to contraction of a single fiber and a whole muscle Contraction produces tension, the force exerted on the load or object to be moved. Review Principles of Muscle Mechanics.
Contraction Jeopardy. Created by Claire Anne Baird, Margie Lemback, and Susan Neal. n’t. ‘ll. ‘d. $100. $100. $100. $200. $200. $200. $300. $300. $300. Final. are not. aren’t. do not. don’t. could not. couldn’t. she will. she’ll. he will. he’ll. they will. they’ll.
Muscular Contraction. Characteristics of Muscles. Muscle fibres are elongated Contraction of muscles is due to the movement of microfilaments All muscles share some terminology: Prefix myo refers to muscle Prefix mys refers to muscle Prefix sarco refers to flesh.
Muscle contraction. Students participating in the presentation: 1- naif aljabri 430101612 2- yousif alessa 430105885 3- faris abalkheel 430101692 4- Ali Moshaba AL-Ahmary 430103532 5-abdulelah bin numay 430104473. Skeletal muscle. Skeletal muscle. Skeletal muscle.
Muscle Contraction. Organization of Skeletal muscle. skeletal muscle. plasma membrane. nuclei. tendon. muscle fiber ( cell ). myofibrils. myofilaments. Structure of striated skeletal muscle. Muscle Fiber muscle cell divided into sections = sarcomeres Sarcomere
Muscle contraction. Structure of Thick Filament. Thick filaments consist of myosin molecules Myosin molecule built of 2 heavy (200000 Da) and 4 light (16000-25000 Da) chains Heavy chains are coiled around each other and form the “tail” of the molecule