Human anatomy

A . Define homeostasis

Homeostasis is the natural ability of the body to balance the internal condition of the body with changes in the external environment . An example of the homeostatic ability of the body is when we shiver when it is cold . Shivering is a result of many physiological processes in the body that have the end objective of preserving internal bodily heat in response to a drop in external temperature . The body 's homeostatic ability is very important to survival because without it , humans can barely survive . The condition in which

the body is unable to maintain its internal environment despite changes in the external environment is known as homeostatic imbalance

B . Distinguish between the terms atom ion and molecule

Matter is composed of atoms , so atom is the smallest particle that makes up matter . The atom contains a mix of positively and negatively charged particles called protons and electrons respectively that circle a central nucleus . Other than these particles , there are also neutral particles called neutrons . When an atom contains more electrons than neutrons , then it becomes negatively charged and is then considered a negative ion . If , on the other hand , there is an excess of protons then it becomes a positively charge ion . If , in the case there is an equal number of both , the atom then does not have any charge at all and is therefore , no longer an ion but when two atoms with a charge each bond together and become neutral they are then...