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Exam 2 Chapter 9

In English

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Kyra Cavanaugh

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a. movement of body b. Posture maintenance c. Heat production: 85% of body heat is generated by skeletal muscle; 25-40% converted to ATP; 60-75% converted to heat

3 key functions of muscle

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61 questions
Lack of exercise decreases myofibrils
Definition of muscle atrophy
Exercise increases myofibril production
Definition of muscle hypertrophy
Hexagonal arrangement of 6 THIN filaments surround each THICK filament and 3 THICK filaments enclose each thin filament
Explain how arrangement of thick and thin myofilaments from the observed sarcomere structural patterns of myofibril
Antibodies destroy ACh receptors; muscle paralysis
Myasthenia Gravis effects neuromuscular junction how?
Prevents acetylcholinesterase which inactivates ACh; muscle spasms
Oreganophosphates effect neuromuscular junction how?
20-40 seconds
During anaerobic respiration, JUST glycolysis lasts how long?
1 minute
During anaerobic respiration, with glycolysis, ATP and CP, and lactic acid pathway, can support strenuous activity for how long?
Increasing number of motor units can contract heavier force
Effect of increasing the number of active motor units on contraction force
Contract more rapidly, faster myosin ATPase, fuel source is glucose, anaerobic and aerobic respiration, more mitochondria,high glycogen, high myoglobin, more capillaries, intermediate diameter, most muscles have combo of bth types
Discuss the intermediate fatigue resistant fibers based on their cellular components, fatigue resistance, duration of contraction and ATPase reaction rate.
Does smooth muscle had a slower or faster contraction than skeletal muscle?
Yes but not arranged in sarcomeres- NO TROPONIN
Does smooth muscle had actin and myosin and troponin?