a. muscle contraction of sustained force resulting from repeated action potentials.
Explanation:
Tetanus is a symptom consisting of the constant contraction of one or more muscles. This can be caused by diseases or other physiological conditions that cause an increase in the frequency of action potentials that promote muscle contractions. Thus, the contractions overlap each other and consequently the muscle remains in a condition of constant contraction.
Altruism is the belief in or practice of disinterested and selfless concern for the well-being of others. It is the principle and moral practice of concern for happiness of other human beings and/or animals, resulting in a quality of life both material and spiritual.
It's a process in the mitochondria known as "oxidative phosphorylation" or "aerobic respiration." **Note: "aerobic" and "oxidative" mean "uses oxygen."
