Levels of Organization & Body Systems

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Presentation transcript:

Levels of Organization & Body Systems Biology

Level 1 - Cells Cells – All living things are made of one or more cells

Level 2 - Tissues Cells that perform the same function work as a team to form tissue. Examples: muscle tissue, cardiac tissue, etc.

Level 3 - Organs Tissues that have roughly the same function work together to form organs.

Organs of a Plant Plants have organs too!

Level 4 – Organ Systems Organs can work together to perform specific functions by being part of an organ system. They often work in pairs.

Organ Systems Continued Digestive System – Breaks down food and absorbs nutrients Excretory System – Processes and removes wastes Respiratory System – brings in O2 and removes CO2 Circulatory System – transports oxygen and nutrients to cell; transports carbon dioxide and wastes away from cells; in both plants and animals; in plants, it is called vascular tissue Skeletal System – the bones of the body; works in conjunction with the muscular system to control movement Muscular System – the muscles of the body; works in conjunction with the skeletal system to control movement Immune System – battles your body’s invaders in an attempt to keep you from getting sick Lymphatic System – consists of lymph nodes (glands) and white blood cells that collect and carry invaders (viruses & bacteria) out of the body Endocrine System – constantly monitors the status of the body and sends hormones and signals throughout the body; works on a feedback loop; ex. – the endocrine system senses when there is sugar in the blood and releases insulin (a hormone) in response Reproductive System – responds to sexual hormones sent out by the endocrine system; makes sperm and eggs, even in plants

This Organ System Controls Them All! Nervous System - sends and receives signals between nerves throughout the body, and the brain.

Level 5 - Organism All the organ systems of the body work together to form a fully functioning organism.