Multiple Choice
Which of the following muscle characteristics is commonly observed as an effect of aging?
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47. Muscle Systems
Musculoskeletal System
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What do all muscle tissues have in common?
A
The individual cells are joined by intercalated discs.
B
The basic contractile unit is the sarcomere.
C
They have transverse tubules along which the action potential travels before it stimulates the release of calcium from the endoplasmic reticulum.
D
The binding site for calcium is located on the troponin complex.
E
Calcium must enter the cytosol before contraction can occur.
Verified step by step guidance1
Understand that muscle tissues are specialized for contraction and share certain fundamental characteristics.
Recognize that muscle contraction is triggered by the presence of calcium ions in the cytosol, which is a common requirement across all muscle types.
Identify that the entry of calcium into the cytosol is a crucial step for muscle contraction, as it allows for the interaction between actin and myosin filaments.
Note that while specific features like intercalated discs or sarcomeres may be present in certain types of muscle tissue (e.g., cardiac or skeletal), the requirement for calcium in the cytosol is universal.
Conclude that the commonality among all muscle tissues is the necessity for calcium to enter the cytosol to initiate contraction, which is a fundamental aspect of muscle physiology.
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