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  #1  
Old 09-19-2012
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Default nbme 5

A 16-year-old boy participates in a study of exercise and muscle hypertrophy. After a pre-training biopsy specimen of the quadriceps muscle is obtained, he begins a weight-lifting program to increase the mass and strength of the muscle. After 3 months of training, a second muscle biopsy specimen is taken for histologic assessment of skeletal muscle characteristics. Compared with the pre-training sample, the post-training sample is most likely to show which of the following findings?

Number of Actin Total number Mitochondria per Myocte # of Myoctes

A) ↑ ↑ ↑
B) ↑ ↑ no change
C) ↑ no change ↑
D) ↑ no change no change
E) no change ↑ ↑
F) no change ↑ no change
G) no change no change ↑
H) no change no change no change

can someone explain
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  #2  
Old 09-19-2012
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Default E is the answer

Quote:
Originally Posted by pathophysio1 View Post
A 16-year-old boy participates in a study of exercise and muscle hypertrophy. After a pre-training biopsy specimen of the quadriceps muscle is obtained, he begins a weight-lifting program to increase the mass and strength of the muscle. After 3 months of training, a second muscle biopsy specimen is taken for histologic assessment of skeletal muscle characteristics. Compared with the pre-training sample, the post-training sample is most likely to show which of the following findings?

Number of Actin Total number Mitochondria per Myocte # of Myoctes

A) ↑ ↑ ↑
B) ↑ ↑ no change
C) ↑ no change ↑
D) ↑ no change no change
E) no change ↑ ↑
F) no change ↑ no change
G) no change no change ↑
H) no change no change no change

can someone explain
The answer is E,
please go to:

http://thefitnessnut.blogspot.com/20...es-muscle.html
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  #3  
Old 09-19-2012
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Default The answer is E

Quote:
Originally Posted by pathophysio1 View Post
A 16-year-old boy participates in a study of exercise and muscle hypertrophy. After a pre-training biopsy specimen of the quadriceps muscle is obtained, he begins a weight-lifting program to increase the mass and strength of the muscle. After 3 months of training, a second muscle biopsy specimen is taken for histologic assessment of skeletal muscle characteristics. Compared with the pre-training sample, the post-training sample is most likely to show which of the following findings?

Number of Actin Total number Mitochondria per Myocte # of Myoctes

A) ↑ ↑ ↑
B) ↑ ↑ no change
C) ↑ no change ↑
D) ↑ no change no change
E) no change ↑ ↑
F) no change ↑ no change
G) no change no change ↑
H) no change no change no change

can someone explain
E. Hypertrophy of the myofibrills, increase the numbers of Mithochondria, and Increase of Myocites #

http://thefitnessnut.blogspot.com/20...es-muscle.html
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Old 09-19-2012
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Post

Quote:
Originally Posted by pathophysio1 View Post
A 16-year-old boy participates in a study of exercise and muscle hypertrophy. After a pre-training biopsy specimen of the quadriceps muscle is obtained, he begins a weight-lifting program to increase the mass and strength of the muscle. After 3 months of training, a second muscle biopsy specimen is taken for histologic assessment of skeletal muscle characteristics. Compared with the pre-training sample, the post-training sample is most likely to show which of the following findings?

Number of Actin Total number Mitochondria per Myocte # of Myoctes

A) ↑ ↑ ↑
B) ↑ ↑ no change
C) ↑ no change ↑
D) ↑ no change no change
E) no change ↑ ↑
F) no change ↑ no change
G) no change no change ↑
H) no change no change no change

can someone explain


it's D......

here the person is using wt. training program-----so increased anaerobic glycolysis of fast twitch fibres leading to hypertrophy---------only no. of actin and myosin proteins increase without increase in mito and no. of myocytes.....
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  #5  
Old 09-19-2012
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Default FF?

well,i think it should be F?
skeletal muscles only can undergo hypertrophy/atrophy but no hyperplasia
in hypertrophy,there is increase in size of the muscle due to stress but no increase in the number of cells.
the increase size will require more mitochondrial activity(more ATP) to meet the metabolic demands imposed on the tissue.
so,FF kind of fits in??
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