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The human body is organized from the smallest living unit (the cell) all the way up to the level of the organism (a living being made of trillions of tiny cells).
Level 1:
Level 1:
Cells
Cells
Cells are the smallest unit of life that conducts all functions of living organisms.
Cell Theory:
Cells come from other cells.
Cells are the basic unit of STRUCTURE and FUNCTION. They perform BASIC FUNCTIONS to keep organisms alive.
All organisms (living things) are made from one or more cells.
Examples of Cells:
Red blood cells
White blood cells
Neurons
Plant cells
Protists
Bacteria
Level 2: Tissues
Level 2: Tissues
Tissues are groups of similar cells that perform the same function.
Tissue Types:
MUSCLE TISSUE: contract and shorten to cause movement of body.
NERVE TISSUE: sends messages from brain to body and back to brain.
CONNECTIVE TISSUE: connects all parts of the body and provides support.
EPITHELIAL TISSUE: lines/covers surfaces of the body, inside and outside.
Level 3: Organs
Level 3: Organs
An organ is a structure composed of different types of tissues working together to perform a complex function.
Examples:
Heart Lungs
Liver Stomach
Muscles Kidney
Pancreas Gallbladder
Esophagus Small intestine
Trachea Skin
Level 4: Organ Systems
Level 4: Organ Systems
Organ systems are groups of organs working together to perform major functions within the body. They combine to form an organism.
Examples:
Digestive System
Excretory System
Respiratory System
Circulatory System
Musculoskeletal
Nervous System
Level 5: Organisms
Level 5: Organisms
Any living being
Examples: Non-Animal Examples:
Human Tree
Dog Mushroom
Earthworm Grass
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