Three major physiological functions which require energy to
perform are :
Digestion and absorption: It requires massive energy for the
peristaltic movement of smooth muscles of GatroIntestinal tract.and
absorption of many substrate takes place throught the active
absorption which also requires energy.
Respiration and Excretion :Respiration involves the respiratory
muscles which help in inspiration ,and requires energy to perform
their function.and Excretion requires energy for active absorption
of solutes from the filtrate.
Cardiovascular activity:It included the transportation of
Oxygenated blood to the tissues all over the body.Heart help in the
pumping the blood through the vessels to body organs .Energy is
required for contraction of cardiac muscles.