Signaling molecules of the endocrine system first bind to a receptor molecule that transduces its signal, meaning that it .

a. changes it to a form that affects the target cell behavior
b. prepares it to travel a long distance in the body to its target
c. blocks it from entering a target cell
d. becomes reabsorbed into the body

the answer is

a. changes it to a form that affects the target cell behavior

Explanation:

answer; i believe the answer is hydraulic action;

cellular respiration oxidizes food into energy in the form of atps.

glycolysis (6 c hexose) > 2x atps are used > 6c hexose biphosphate > 2 x 3c triphosphate >

2 x 3c pyruvate (2x nadh produced from nad) and (4x atp produced)

pyruvate actively pumped mitochondrial matrix.