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In the context of sliding filament theory, what is the basic functional (contractile) unit of skeletal muscle?
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9. Muscle Tissue
Sliding Filament Theory and the Sarcomere
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Myosin storage myopathy is a rare congenital condition where some of the myosin folds incorrectly in certain skeletal muscles creating clumps. Individuals with this condition exhibit muscle weakness and may be delayed in learning to walk as infants. What changes would you expect to see if you were to examine the sarcomere of an individual with this condition?
A
The thick filament would form protein clumps.
B
The thin filament would form protein clumps.
C
The titin would form protein clumps.
D
The fascicle proteins would form clumps.
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Understand the structure of a sarcomere: A sarcomere is the basic contractile unit of muscle fiber, composed of thick filaments (myosin) and thin filaments (actin), along with other proteins like titin.
Identify the role of myosin: Myosin is a motor protein that forms the thick filament in the sarcomere and is crucial for muscle contraction.
Consider the impact of myosin misfolding: In myosin storage myopathy, misfolded myosin can lead to the formation of clumps, disrupting the normal structure and function of the sarcomere.
Analyze the expected changes in the sarcomere: Due to the misfolding of myosin, you would expect to see clumps of thick filaments within the sarcomere, affecting muscle contraction.
Evaluate the options: Given the condition affects myosin, the correct expectation is that the thick filament would form protein clumps, rather than the thin filament, titin, or fascicle proteins.
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