An animal loses foraging time while it travels and expends energy through its locomotion. The body expends more energy than it takes in. This is costly as ejaculation expends much energy. A countercurrent mechanism system is a mechanism that expends energy to create a concentration gradient. The particle expends its energy on ionization of atoms located near its trajectory. Wide foraging expends more energy, and is used when prey is sedentary or sparsely distributed. Birds beg more intensely when they are hungry even though it expends more energy. The bar is blue and gradually decreases as the player expends energy. The "Young Shuffle" has been adopted by some ultramarathon runners because it expends less energy. This had relatively little effect on accuracy, but expends energy quickly, limiting effective range. A 4 MET activity expends 4 times the energy used by the body at rest. To cross bodies of water, swimming sequences can be triggered, which expends oxygen. Fury later expends the last sample of the Infinity Formula to save Bucky's life. Jack expends the last three leaves of the tree with the words "I forgive you". Fish expends few words on theological matters.