Exam+2+--+Spring+2004+Short+Ans+--+Blank

Exam+2+--+Spring+2004+Short+Ans+--+Blank - Dr S Pavgi...

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Unformatted text preview: Dr. S. Pavgi Student name \J Jar/i - I i ‘4! \ chi“? 9’ B10225, Spring 2004, Exam 11 Student ID# i“ a «2 if} 5% Total points 100 1310225 Spring Term 2004 Exam—H Short essay Questions. If you need more space to write your answer, use the back of the Question sheet. Q33. a. When an action potential reaches the tip of the axon at a neuromuscular junction opening of which ion channel is essential for the release of acetylcholine? 3 points b. Name the type of receptors found at the neuromuscular junction that initiate skeletal muscle confracfion 31366 binding to above mentioned neurotransmitter. 3 points c. What adverse effects an inhibitor of cholinesterase would have at the neuromuscular junction? 6 points Dr' 5' Pavgi Snider“ name B10225, Spring 2004, Exam 11 Student [D# t x a » Total points 100 Q34a. Brown fat is a source thermoregulatory heat production in babies. Brown fat is rich in which of the cell organelle that gives it the characteristic brown color and is also the site of cellular heat production? 3 points b. Name the hormone that stimulates metabolic heat production from the brown fat? 3 points 0. Name the hormone that facilitates the action of the above mentioned hormone. 3 points 3 d. Describe the mechanism involved in the release of metabolic energy as heat to elevate baby’s body temperature. 3 points Dr. S. Pavgi B10225, Spring 2004, Exam II Total points 100 Student name Student ID# Q35. A man wants to lift a dumbbell weighing 8 kg in his hand and hold it at 900 to his upper arm a. How much total force/load (in kg) the biceps needs to exert? Show your calculation. 6 points Work = force X distance Workdown = Workup Weight of the forearm at the center of gravity = 2 kg Distance from the fulcrum to the center of gravity = 150m Distance from the fulcrum to the point of biceps insertion into the lever (forearm) = 5 cm Distance from the fulcrum to the hand = 25 cm UV "1 n u LULUF’ Dr. S. Pavgi B10225, Spring 2004, Exam II Total points 100 Q35b. Question 35 continued: Student name Student ID# If the 8 kg weight is attached to a 25 cm long stick that the man holds in his hand then how much total force/load the biceps needs to exert? Show your calculation. 6 points Work = force X distance Workdown = Workup Weight of the forearm at the center of gravity = 2 kg Distance from the fulcrum to the center of gravity = 15cm Distance from the fulcrum to the point of biceps insertion into the lever (forearm) = 5 cm Distance from the fulcrum to the hand = 25 cm Length of the stick = 25 cm ...
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