Assignment 2 – (50 marks).

Added on - 16 Sep 2019

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Assignment 2(50 marks)1.Briefly describe the three categories of levers, an example of each and if each oneworks at an advantage or disadvantage.(3 marks)2.Name and describe the locations and actions of the muscles typically used inbreathing.(4 marks)3.Briefly answer to the following questions:(4 marks)a.Describe four ways drugs can modify the effects of neurotransmitters.b.Describe the three ways neurotransmitters can be removed.c.Describe the two conditions that allow maintenance of the resting membranepotential in excitable cells.d.Briefly describe what causes the depolarizing phase.4.Answer to the following questions:a.Describe the gross external anatomy of the spinal cord.(3 marks)e.Identify the components of a spinal reflex arc, and describe the function ofeach.(3 marks)5.In 1848, a railroad worker named Phineas Gage was seriously injured during anexplosion on the job. A tapered metal rod ranging from 0.25 inches to 1.25 inchesin diameter and over 3 feet long entered his skull just under his left cheek boneand exited through the top of his skull. The rod was found over twenty feet away.Amazingly, Gage lived even though he suffered massive damage to the left front ofhis brain. His personality and intellectual abilities changed, however. Before theaccident, he was respected as a smart, capable and even-tempered man. After theaccident, he was foul-mouthed and bad-tempered and could not make up hismind. In the years immediately preceding his death, he began to have epilepticseizures. Explain the changes observed in Mr. Gage based on your knowledge ofthe brain.(4 marks)
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