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Title: You need to step up on a step to reach an object on a high shelf over your head. Your starting ... Post by: shaundavis24 on Mar 1, 2011 I cannot find anything about this in my book... can anyone help with this??? PLEASE!
Situation: You need to step up on a step to reach an object on a high shelf over your head. Your starting point should be anatomical position and your finishing point should be the position you are in once your hand has reached the object overhead. Instructions: (Part 1) Trace the nerve impulse, listing the “macroscopic” structures and steps in as much detail as possible, from which your brain sends the message to the appropriate muscles to step up one step. Title: You need to step up on a step to reach an object on a high shelf over your head. Your starting ... Post by: bio_man on Mar 1, 2011 Hey, welcome back.
You have to answer this using knowledge of the sliding filament theory. Check the animations section for animations on this process or search the forum - lots of stuff available. Basically the sliding filament model explains how the myosin head moves down the actin polymer, generating movement. It starts when a neurotransmitter, acetylcholine, is released unto skeletal muscles. When acetylcholine binds to acetylcholine receptors on skeletal muscle fibers, it opens ligand-gated sodium channels in the cell membrane. Sodium ions then enter the muscle cell, initiating a sequence of steps that finally produce muscle contraction. When a muscle contracts, myosin molecules coil up like springs to shorten the length. Myosin is a motor protein that converts the chemical bond energy of ATP into the mechanical energy of motion. Each myosin molecule acts as an enzyme that both binds ATP and releases its energy, and the energy released by ATP produces the power stroke by swiveling the myosin head. As ATP binds to the myosin head at the beginning of a muscle contraction cycle, the myosin head detaches from actin. This should help you get started, shaundavis24. Hope this helps! Also, try this step-by-step animation: http://bcs.whfreeman.com/thelifewire/content/chp47/4702001.html (http://bcs.whfreeman.com/thelifewire/content/chp47/4702001.html) Bio_man Title: You need to step up on a step to reach an object on a high shelf over your head. Your starting ... Post by: duddy on May 2, 2011 Is this question solved? If so, please mark it as solved.
Title: You need to step up on a step to reach an object on a high shelf over your head. Your starting ... Post by: imranrocks on May 18, 2011 I cannot find anything about this in my book... can anyone help with this??? PLEASE! Situation: You need to step up on a step to reach an object on a high shelf over your head. Your starting point should be anatomical position and your finishing point should be the position you are in once your hand has reached the object overhead. Instructions: (Part 1) Trace the nerve impulse, listing the “macroscopic” structures and steps in as much detail as possible, from which your brain sends the message to the appropriate muscles to step up one step. u need to look at the animation for this also remember your nerves it will help out. :) |