Gets oxygen from the air during inhalation (breathing in) and removes waste carbon dioxide from the body during exhalation (breathing out)
Alveoli
Grape-like air sacs where gas exchange with the blood happens
Thin walls
Huge surface area
Surrounded by capillaries
The alveoli are well adapted for gas exchange
Trachea
Tube that carries air to and from the lungs
Bronchioles
Smaller branches of the trachea that carry air to the alveoli
Plants also have organs and organ systems
Plant organ systems
Roots
Stems
Leaves
Root hair cells
Have a large surface area to increase absorption of water and minerals from the soil
Xylem tissue
Consists of hollow tubes of old, dead plant cells strengthened by spirals of lignin which support the stem and can withstand water pressure
Phloem tissue
Composed of tubes of elongated cells, cell sap can move from one phloem cell to the next through pores in the end walls, assisted by living companion cells
Transpiration
Movement of water from the soil, into the roots, up through the stem, and out the stomata on the underside of the leaves into the air
