Which of the following would NOT be a proper label for deflections from the heart?

Which of the following statements describes the role of transcription factors (TF) in hematopoiesis?

a. TF expression does not change during hematopoiesis. b. TF function either to activate or suppress target gene expression. c. TF block the differentiation pathway for hematopoietic precursors. d. TF abnormalities are rarely seen in hematologic malignancies.

Changes due to the aging process might include:

a. an increase in melanin pigment production b. increased immunity c. a decrease in infections d. a decrease in intestinal motility