muscle (True or False)

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dat_student

dat_student

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True or False

(T/F) z line contracts
(T/F) m line contracts
(T/F) H-band contracts
(T/F) A-band contracts
(T/F) I-band contracts
 
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Divineimpetus said:
i thought the H and A contracts..
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A-band never contracts. The only thing that makes no sense to me is: Why do people say thin filament contracts but I-band doesn't. Isn't I-band made up of thin filament? Aren't I-bands brought closer during contraction?
 
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dat_student said:
A-band never contracts. The only thing that makes no sense to me is: Why do people say thin filament contracts but I-band doesn't. Isn't I-band made up of thin filament? Aren't I-bands brought closer during contraction?
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yes the i-bands are brought closer together during contraction, and the size of the i-bands are reduced as well.

i dont think you can use the word "contract" when referring to the filaments. the thick and thin filaments "slide" by each other and the bands change accordingly.
 
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tinman831 said:
yes the i-bands are brought closer together during contraction, and the size of the i-bands are reduced as well.

i dont think you can use the word "contract" when referring to the filaments. the thick and thin filaments "slide" by each other and the bands change accordingly.
Click to expand...

I-bands are brought closer together but the size doesn't change.
 
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