Cells in Organisms

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Neuron

Sends messages from brain to move up

Leukocyte

keeps the tissues involved free of disease

Erythrocyte

keeps tissues involved alive, provides oxygen for energy for motion

Functioning Organism

must possess interrelated systems; can be unicellular; can be plant or animal

Kidney, heart, stomach, liver,

Organ

Algae, frog, rabbit

Organism

System Level

Organisms at this level have their cells arranged into systems

Tissue Level

Organisms at this level have their cells arranged into tissues

Cellular Level

Organisms in this level are either unicellular or colonial

Colonial

Organisms that live in a group called a colony

What process does some leukocytes absorb entire bacteria?

Phagocytosis

Organ Level

A degree of organism complexity. Organisms at this level have their cells arranged into organs

Organism

A functional plant or animal, existing through the cooperative organization of interrelated systems;

System

A group of organs working together for a common purpose

Organ

A group of tissues working together as a unit

Excretion

A system operation in amoeba

Muscle Fiber

A very long, contracting cell

Tissue

Cells working together to perform a particular task

Amoeba, paramecium, euglena

Cellular (1)

Colonial organisms

Cellular (2)

Respiratory, digestive

System

Organism Level

The highest level of complexity of a living thing

Specialization

The limiting of the function of a cell to a specific function; multicellular organisms exhibit a division of labor among cells

Division of Labor

The work being divided up into specialized tasks

Muscle, fat, bone

Tissue


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