Diff: 2 Page Ref: 685-686. 18) If the vagal nerves to the heart were cut, the result would be that ________. A) the heart would stop, since the vagal nerves trigger the heart to contract. B) the heart rate would increase by about 25 beats per minute. C) the AV node would become the pacemaker of the heart.
Living things have seven essential processes in common:  movement, respiration, sensitivity, growth, reproduction, excretion and nutrition. All things fall into one of three categories: living, used to be living or not living; the presence of all seven life processes indicates a living thing.
This process happens for all kinds of living creatures. Mammals experience it in the lungs, fish experience it in the gills, earthworms experience it in their skin and amoebas experience it in their cell surface. There are two types of respiration. The first one is called aerobic respiration. This is when food is broken down to provide energy to the living organism, although it shouldn't be confused with digestion. Aerobic respiration creates ATP, a source of energy, from the breakdown of glucose and creates carbon dioxide.