Question

multiple choice question
the heart may shrink with age. why?
o blood volume decreases with age; therefore, the heart doesnt contain the same volume.
o muscle cells die and are not replaced.
o calcium loss leads to shrinkage of the skeleton of the heart.
o cells shrink with decreased activity.

Explanation:

As people age, muscle cells in the heart (cardiac - muscle cells) can die and not be fully replaced, leading to heart shrinkage. Blood - volume change is not the main cause for heart shrinkage. The heart doesn't have a true "skeleton" like the body's skeletal system, and while cell activity may change with age, the primary reason is the loss of muscle cells.

Answer:

Muscle cells die and are not replaced.