When you have finished this section, take the Animals Functions Quiz.
The study of animals is called zoology.
Animals are different from plants in several important ways.
Because animals are more complex or advanced than plants, they have different systems in their bodies to take care of the different jobs that allow them to live and function. Below is a description of these systems and illustrations of organs of these systems in humans. These systems are:
- The muscular/skeletal system of an animal refers to the systems
that give the animal its shape, protects its organs and allows it to move.
Animals' bodies are protected in many ways. For some animals it is an outer
skeleton or exoskeleton that protects their body. For others it is an inner
or internal skeleton that protects the body. These skeletons give the animal
bodies their shapes. An animal's form or body can be arranged to have
||Reproduction - This is how an animal makes more of itself or has babies. Animals can reproduce several ways.|
|Excretion - This is how an animal gets rid of wastes after it uses energy to do its work. In humans kidneys and skin do this job.|
|Digestion - This is how an animal breaks down the food it takes into its body. In humans the mouth, stomach and intestines are part of the digestive system.|
||Respiration - This is how an animal takes in oxygen and gives off carbon dioxide as it uses energy. In humans the nose, throat and lungs would be part of the respiratory system|
||Circulation - This allows food and energy to be distributed throughout the animal's body. In humans the heart, blood and blood vessels are part of the circulatory system.|
||Nervous - This is how an animal takes in information from the world and uses that information to react to the world and to go about its life. This would include the animal's senses, its brain and nervous system.|
All of these systems influence where an animal lives and how it survives. An animal that needs to live in water would not survive long on land and vice versa. Depending on how advanced these systems are in animals determines the group they belong in as well as how alike the systems are between and among the animals.
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