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The Hierarchy of the Human Body Ladder
Natalie Vang
This is the basic level of the structure, made of the smallest unit of matter called atoms, combined to form molecules.
Molecules is what the body is depends on many kind molecules, such as water, proteins, and carbohydrates.
Ninety-nine percent of the human body is composed of just six types of atoms—oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorous.
Our next step up the ladder is the cellular level, where many molecules together form the smallest unit of living matter called a cell. A cell is both a structure and a functional unit, meaning that the parts work together chemically and physically.
This is the smallest building blocks of all living beings, which are composed of organized groups of specialized molecules. Groups of similar cells with a common function form tissues.
These cells are what make up the tissues of our bodies, or distinct types of material of which animals or plants are made.
Tissues are another rung up the ladder. There are four main types of tissue in the human body:
Epithelial tissue: membrane or skin that covers the outside of the body and the surfaces of organs within the body
Connective tissue: binds together, supports, and protects the parts of the body
Muscle tissue: responds to stimulation and can contract
Nervous tissue: acts as a pathway to allow communication between different regions of the body
Tissues work together to form the next level on our hierarchy of the body’s structure: organs. An organ is a structure made of two or more types of tissue that perform a specific function in the body.
Each is made of specialized cells that are grouped together according to structure and function.
One more step up, and we have organ systems. These are groups of organs working together to complete a job. Think of the digestive system, which includes the mouth, stomach, large and small intestines, and numerous other organs; they all work together to digest the food you eat and, consequently, provide energy and nutrients to your body.
Some organs are called hollow organs because they have an empty tube or pouch
The eye is an organ that is generally considered part of the nervous system.
And finally, the top rung of our structural ladder is the whole organism. The entire body as a unified organism is composed of all these structural levels, with tiny atoms forming molecules, molecules working together to make cells, cells functioning together in tissues, tissues cooperating to form organs, and organs working together in systems to do the jobs within the body. All these systems cooperate, from the tiny to the large, working together to form the structure of a living body.
Organisms can be made up of just one cell. They are called unicellular organisms or single celled organisms.
Organisms are classified by taxonomy into specified groups such as the multicellular animals, plants, and fungi; or unicellular microorganisms such as a protists, bacteria, and archaea.
"Structure of the Body: Form." Anatomy, Physiology, and Medical Terminology in a Nutshell. https://wisconsinvl.instructure.com/courses/4721/modules/items/266038. unkown.