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Levels of Biological

Organization

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Area of Focus: Levels of Biological Organization.

Atom

Molecule

Cell Organelle

Cell

Tissue

Organ

Organ System

Cell

Organism

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Cells are the structural and functional units of all living organisms.

Humans have some 75-100 Trillion

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All of your bodies cells come from stem cells. Stem cells can differentiate into specialized cells that characterized specific body parts.

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Many cells make a tissue.

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Tissue: A group of similar cells that perform the same function.
There are 4 types of tissue:

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Muscle Tissue

Movements of the body are possible because of muscle tissue.

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Some common muscle tissue in the human body include…
Muscle Tissue: Can contract / shorten.

Smooth Muscle Tissue

Skeletal Muscle

Cardiac Muscle

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Connective Tissue

Tissue that provides support for the body and connects its parts is �connective tissue.

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Some common connective tissues in the human body include…

Bone Tissue

Fibrous Connective Tissue

Adipose – Fat Tissue

Blood

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Some common connective tissues in the human body include…

Bone Tissue

Fibrous Connective Tissue

Adipose – Fat Tissue

Blood

Cartilage

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Nervous Tissue

Nerve impulses are transmitted throughout the body by nervous tissue.

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Some common nervous tissues in the human body include…

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Epithelial Tissue

The tissue that lines the interior and exterior body surfaces is called epithelial tissue.
Your skin and the lining of your stomach are both examples of epithelial tissue

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A group of tissue makes an organ.

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Organ: A group of different tissues with a specific job

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Many organs make an organ system.

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Organ System: A group of organs that work together to perform a specific job.

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A group of organ systems make an individual.

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Homeostasis: The ability of an organism or cell to maintain internal equilibrium by adjusting its physiological processes.

Regardless of outside conditions.

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Negative Feedback

Negative feedback, is the process in which a stimulus produces a response that opposes the original stimulus.