Which of the following statement most directly supports the claim that changes in normal signal transduction can alter cellular response?

Which of the following statement most directly supports the claim that changes in normal signal transduction can alter cellular response?

A. Injury to blood vessels triggers a cascade of changes to blood proteins that results in blood clotting.

B. Oral birth control medications bind to cell receptors in the pituitary to prevent the release of hormones that stimulate ovulation.

C. Physical activity stimulates heart rate and oxygen uptake in both healthy and immune-suppressed individuals.

D. Infection by a flu virus leads to activation of helper T cells and the induction of antibodies by B cells.