At what ages does lymphoid tissue reach twice its adult size?

At what ages does lymphoid tissue reach twice its adult size?

• A. Ages 6 to 8 years
• B. Ages 10 to 12 years
• C. Ages 14 to 16 years
• D. Ages 8 to 10 years

Answer: (B)

Lymphoid tissue in children enlarges as the immune system responds to many infections, and it commonly reaches about twice its adult size around preadolescence. This peak happens roughly between ages 10 and 12, after which the tissue gradually involutes toward adult size during adolescence due to hormonal changes and decreased antigenic stimulation. So, the 10–12-year range is when this doubling is most typical. Earlier ranges include ongoing growth toward that peak, while the oldest range reflects the period after the peak when the tissue is shrinking back toward adult dimensions.

Lymphoid tissue in children enlarges as the immune system responds to many infections, and it commonly reaches about twice its adult size around preadolescence. This peak happens roughly between ages 10 and 12, after which the tissue gradually involutes toward adult size during adolescence due to hormonal changes and decreased antigenic stimulation. So, the 10–12-year range is when this doubling is most typical. Earlier ranges include ongoing growth toward that peak, while the oldest range reflects the period after the peak when the tissue is shrinking back toward adult dimensions.