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Muscle Relaxation -When the nerve impulse stops several things happen… _____gets broken down by the enzyme _________________________ (found at the _____________________.

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Presentation on theme: "Muscle Relaxation -When the nerve impulse stops several things happen… _____gets broken down by the enzyme _________________________ (found at the _____________________."— Presentation transcript:

1 Muscle Relaxation -When the nerve impulse stops several things happen… _____gets broken down by the enzyme _________________________ (found at the _____________________ junction). Once ____is broken down, __________ions are transported back to the ______________ reticulum. When the levels of _______ drops, linkages are no longer able to form between thin ________ and thick ________ filaments. Since there are no ____________, the muscle ____________.

2 The relaxed and contracted sarcomere Relaxation Contraction AA Actin – thin filament Myosin – thick filament Myosin head Muscle contraction animation

3 Neuromuscular Junctions Every skeletal muscle cell is connected to an ________of a ________ __________. _________ ______: a _______ _______and all of the ___________fibers it connects.

4 Parts of the Neuromuscular Junction _____________________ ______________: The connection between the ________ _________ and the _________ _________. ________ ______ _________: specialized portion of the _________ fiber _________, it is extensively _________ (to increase surface area) and contains many _______________. _________ ______: the space between the _________ end plate (on the _________ fiber) and the _________ _________, this “_________ ” is filled with a _________ material rich in _________.

5 _________ : end of the _________ cell _________ : _________ sac formed by _________ in of the ____ membrane _________________: _________ that are released at the end of a _________ – ______________(___): _________________th at stimulates the muscle to _________ Parts of the Neuromuscular Junction

6 Neuromuscular Junction Synaptic cleft Mitochondria End-plate of muscle cell

7 How the neuromuscular junction works 1._________ impulses travel down the _________ to the _________. 2.The ________________, Ach, is _________ in the _________ of the motor _________. 3.When an impulse reaches the _________ of the _________, the neuron releases ____________ (via vesicles) across the synaptic cleft. 4.The ______________binds to muscle _________ to stimulate a muscle _________. 5.The muscle _________ is then sent in all directions over the _________ and through the _________ to the _________________ reticulum.

8 Neuromuscular junction and sarcoplasmic reticulum hill.com/sites/ /student_view0/chapter9/animati on__action_potentials_and_muscle_contraction.html

9 Energy for Muscle Contraction ________________ oxidizes the sugar _________ and stores the _________ in the form of _____. When _____ is exhausted for _________ contraction, _________ phosphate can transfer energy to ______. Blood carries _________ to the _____________. _________ is carried on the _________ of red blood cells. _________ debt may occur if the body cannot supply enough _________ for _________ muscles.

10 Energy for Muscle Contraction Muscles use _________ respiration when they cannot get enough _________. _________  _________ acid + __ ATP _________ is broken down to _________ acid which reacts to form _________ acid. The build up of _________ acid can cause _________ and _______ in muscles.

11 When enough _________ is available, _________ respiration occurs. Muscle _________ : muscle loses the ability to _________ due to a low _________ supply, exhaustion of _________________, or accumulation of _________ acid. _________ acid is broken down in the _________ and then used for _________.


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