Learning and memory researchers have discovered that :
A.) physical exercise promotes new cell growth, while mental ecercise only maintains exsisitng cells.
B.)stem cells can divide and mature throughout adulthood.
C.) age is the biggest limiting factor in the creation of new cells
D.)memory can improve with repetion, but learning has a curve which new cells do not change.
I am thinking B.
I think B.
To determine the correct answer, we can break down the statements and explain how we can arrive at the correct answer.
Option A states that physical exercise promotes new cell growth, while mental exercise only maintains existing cells. This statement is incorrect. Research has shown that both physical and mental exercise can promote the growth of new cells in the brain, a process known as neurogenesis. So, option A is not the correct answer.
Option B states that stem cells can divide and mature throughout adulthood. This statement is correct. Stem cells are undifferentiated cells that have the ability to divide and differentiate into various cell types. In the context of the brain, neural stem cells can give rise to new neurons, and this process continues throughout adulthood. So, option B is the correct answer.
Option C states that age is the biggest limiting factor in the creation of new cells. This statement is partially true. As we age, the rate of neurogenesis tends to decline, and various factors, such as stress or certain medical conditions, can further affect the creation of new cells. However, age alone is not the only limiting factor. So, option C is not the correct answer.
Option D states that memory can improve with repetition, but learning has a curve that new cells do not change. This statement is incorrect. Research suggests that the formation of long-term memories involves the creation of new connections between neurons, and this process can be affected by the generation of new cells. So, option D is not the correct answer.
In conclusion, the correct answer is B - stem cells can divide and mature throughout adulthood.