How can we answer these questions? rences Mailings5Review View HelpALT1- v i- v a- vParagraphDIU 201 1011 ZVEJ→=aNormalNo SpacingHeading 1StylesQ SearchHeading 2TIVIZOLaFRuva1.To understand myasthenia gravis, you have to understand the chain of events from the conscious decision tomove a limb to the eventual stimulation of a muscle cell. Describe how nerve impulse conducted down the axonof a motor neuron induce contraction of the Mr. Aletha's muscle cells (Figure 31.1).2. If you want to lift a whole bag of groceries versus a single apple, how do you increase the force with whichyou contract a muscle such as your biceps? What is a motor unit? What is the difference between temporal andspatial summation?3. What is the neurotransmitter that acts at the motor endplate to initiate muscle contraction?4. Muscle cells are full of the actin and myosin proteins.a. Briefly describe the arrangement of the actin and myosin molecules within the cell. How does the interactionbetween actin and myosin result in shortening of the muscle cell?b. Which molecule provides the energy to break the actin-myosin bond?c. Would the muscle be able to contract if they run out of energy? Explain why.d. What happens to muscles in the case of death? Why do the muscles stay in contracted state and relax onlyafter a certain period of time?5.Myasthenia gravis is an autoimmune disease in which the body's immune cells attack and destroy theacetylcholine (Ach) receptors in the motor end plates of muscles in the shoulder, neck, and face. When muscledo not contracts. Muscle atrophy (loss of muscle mass) is caused by not using the muscles enough. Why wouldMr. Aletha experience a progressive weakening even if he tries to do more exercise?6. Do aerobic (endurance) and resistance exercises produce the same effect on muscles? How do enduranceand anaerobic exercises normally enhance your ability to contract muscles?T Layout References Mailings Review View HelpA A Aa AE-EAA.FEL TParagraphSynaptic end bulb,AxonNormalActionpotentialSynapticvesiclesShirley was assigned to take Mr. Aletha to physical therapy. She helped Mr. Aletha into the wheelchair and tookhim down the hallway to the room where he was to receive strengthening exercises for his generalized muscleweakness. Mr. Aletha told Shirley that he often felt okay at the beginning of his therapy session but becameweaker as the session progressed. Mr. Aletha was in the hospital because of this perplexing problem. One dayShirley went to Mr. Aletha's room to take him to therapy, but Mr. Aletha told her that the sessions werecanceled: The therapy would not help his condition because he had myasthenia gravis. Shirley had heard aboutthis disease but did not understand the physiology. She went to her anatomy text and began to read thechapters on muscle contraction and nerve transmission. Help her answer the following questions so she can putthis puzzling disease in perspective.(*)8Motor neuronGNo SpacingVoltage-gatedCa channelSynaptic cleftHeading 1Motor end plateStylesMusclefibers- NeurotransmitterWNeurotransmitterreceptorsHeading 2TitleFindReplaceSelectFE EditingPCCDiV

Sensory organs consists of sensory neurons that convey the information to the central nervous system…

Answered: Isthenia gravis, you have to understand…

1st Edition

ISBN:9781938168130

Author:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble

Publisher:Kelly A. Young, James A. Wise, Peter DeSaix, Dean H. Kruse, Brandon Poe, Eddie Johnson, Jody E. Johnson, Oksana Korol, J. Gordon Betts, Mark Womble