When the micturition reflex is initiated, the brain responds by decreasing action potentials (aps) in somatic motor neurons, resulting in the relaxation of the external urinary sphincter so urine can be voided.
According to research these are the 7 Characteristics of Life:
<span> 1. Living Things are Composed of Cells:</span>
<span>Single-cell organisms have everything they need to be self-sufficient.In multicellular organisms, specialization increases until some cells do only certain things.</span>
<span>2. Living Things Have Different </span>Levels of Organization:
<span>Both molecular and cellular organization.Living things must be able to organize simple substances into complex ones.<span><span>Living things organize cells at several levels:
</span><span><span>Tissue<span> - a group of cells that perform a common function.</span></span><span>Organ<span> - a group of tissues that perform a common function.</span></span><span>Organ system<span> - a group of organs that perform a common function.</span></span><span>Organism<span> - any complete living thing.</span></span></span></span></span>
An artificial heart has been altered by man in some way. Like if they had a valve replaced it becomes artificial.
Natural Selection.
It favors the better adapted organisms.
