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6th grade human body systems review

organizational hierarchy

cell, tissue, organ, organ system, organism


a living thing.

organ system

a group of organs that work together to perform a major function.


a structure composed of different kinds of tissue that perform a specific function.


a group of similar cells that perform a specific function.


the basic unit of structure and function in a living thing.

Skeletal System

Structures: bones, joints, ligaments, and cartilages
Function: supports and protects the body.

Muscular System

Structures: muscles, tendons
Function: enables movement of the body and internal organs.

Circulatory System

Structures: heart, veins, arteries, capillaries, blood
Function: transports oxygen and nutrients to the cells of the body.

Respiratory System

Structures: trachea, lungs, bronchi, alveoli
Function: takes in oxygen and eliminates carbon dioxide

Digestive System

Structures: Mouth, esophagus, stomach, small and large intestine
Function: breaks down food and absorbs nutrients.

Nervous System

Structures: brain, spinal cord, nerves
Function: detects information from the environment and controls body functions.

Excretory System

Structures: skin, lungs, kidneys, ureters, bladder, urethra
Function: removes wastes produced by cells

Immune System

Structures: white blood cells, antibodies, lymph nodes, skin
Function: defends the body against disease


the body's ability to respond to its environment to keep itself alive.

cellular respiration

a process that happens in mitochondria where oxygen is chemically combined with glucose in a cell to release energy.

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