Aaron is a healthy, 65-year-old man. Compared with his 24-year-old son Harry, Aaron has much less brain volume. Which of the following is most likely the reason for this difference?
A) Harry has a lower number of synapses than Aaron has.
B) Aaron is experiencing shrinkage of neurons.
C) Harry has reduced tree-like branching in the dendrites of his brain.
D) Aaron has a thicker corpus callosum than Harry has.

Question

Quizplus · Accepted Answer

As we age, our brains experience a natural shrinkage of neurons, which results in less overall brain volume. Therefore, it is likely that Aaron has less brain volume than Harry due to this normal aging process.

Aaron Is a Healthy, 65-Year-Old Man