Question

value: 25

a sarcomere is made of one a band and one i band

true
false

Explanation:

Define a sarcomere

A sarcomere is the basic functional unit of striated muscle tissue. It is defined as the segment between two neighboring Z-lines (or Z-discs).

Analyze the band composition

A single sarcomere contains one full, dark A band in the center. However, it does not contain a full I band. Instead, it contains two halves of an I band (one half-I band on each side of the central A band, extending to the Z-lines).

Evaluate the statement

The statement claims a sarcomere is made of "one A band and one I band." Because it only contains two half-I bands rather than a single complete I band within its boundaries, the literal anatomical description is false.

Answer:

• True
• False (Correct answer)