Describe the contributions of Schlieden and Schwann to the cell theory.

Schwann - In 1839, he cells are the basic unit of animal structure

Schlieden - In 1838, he discovered cells are the basic unit of plant structure

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when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.