How do you differentiate "human act" from "act of man"?

A human act is an action that is considered to be carried out voluntarily, whereas an act of man is an involuntary action. The distinctions and nuances between an act of man and a human act are often a focus of philosophical debate.

In essence it is agreed that a human act is an act on which an individual can make a conscious decision whether or not to carry out that act. An act of man is the natural act of vegetative and sense faculties such as digestion, the beating of the heart, growing, bodily reactions and visual or auditory perceptions. The debate takes place around the fringes of these definitions. Acts of man, for example, can be considered human acts if the action is carried out with malice.