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Cells and cell theory


capture energy from sunlight and use it to produce food for the cell

cell wall

a rigid structure that surrounds the cell membrane and provides support to the cell

Robert Hooke

English scientist who was the first to observe "small chambers" in cork and call them cells. (1665)

cell theory

1.)idea that all living things are composed of cells 2.)cells are the basic units of structure and function in living things 3) new cells are produced from existing cells


Ocular Lens X Objective Lens

stem cell

Long tube-shaped cells that move water and other materials through the plant.


small structures in the cytoplasm that do special jobs


the process by which plants make food

leaf cells

brick-shaped and contain many chloroplasts; the site of photosynthesis

root cells

block shaped and do not contain chloroplasts; no photosynthesis occurring because they are underground where there is no sunlight

levels of organization of the human body

Cells, tissues, organs, organs systems, organism


smallest organisms on Earth; one-celled organisms that contain no organelles


groups of similar cells that perform a specific function in an organism


the basic structural and functional unit of all organisms


a structure in the body that is composed of different kinds of tissue

organ system

group of organs that work together to perform a specific function

cellular respiration

The process by which a cell's mitochondria use oxygen to produce energy from food.


An instrument with lenses and light that is used to observe objects too small to be visible with only the eyes.

nerve cell

Long and have many branches which allows them to receive and deliver messages quickly.

bone cell

Surrounded by a hard substance made of calcium and phosphorous.

fat cell

Can store so much fat that the nucleus gets pushed against the cell membrane.

muscle cell

Usually long and have many fibers that can constract and relax.

skin cell

Mostly flat and close together. They form a protective layer for your body.


Organ systems each performing a specific function working together.

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