Antigen-sensitized cells that remain in circulation for long periods of time are called
A) platelets. B) memory cells. C) leukocytes. D) erythrocytes.
Question 2
Aging gut refers to
A) reduction in the biodiversity of gut microbiota and increase in pathogenic bacteria.
B) impairment of the accessory organs of digestion.
C) an increased risk for constipation as we age.
D) an age-related increase in gastroesophageal reflux disease (GERD).