BENEFITS OF BEING MULTICELLULAR• Larger Size: larger organisms are prey for fewer predators. Also, large predators can eat a wider variety of prey• Longer Life: not limited to the life span of any single cell• Specialization: each type of cell has a particular job. This makes the organism more efficient!
4. Protective TissueExample: Adipose (fat) cells in the skin
PLANT TISSUES• Plants have 3 types of tissue: 1. transport tissue 2. protective tissue (dermal) 3. ground tissue
LEVEL 3: ORGAN TISSUES WORKING TOGETHER• Organ = a collection of tissues that carry out a specialized function of the body• Example: heart - has mostly cardiac tissue, but also has nerve tissue and tissues of the blood vessels that all work together • Other examples: stomach, intestines, brain, and lungs
• Examples in plants: the leaf plant organ that contains tissue that traps light energy to make food• Also: stems and roots
IS THAT A FACT?! In your lifetime, your body will shedabout 40 pounds of dead skin!
LEVEL 4: ORGAN SYSTEM ORGANS WORKING TOGETHER• Organ system = group of organs that work together to perform body functions• Examples: digestive system, which includes several organs, such as the stomach and intestines
ON ITS OWN: ORGANISM• Organism = a living thing; anything that can carry out life processes independently• An organism can be unicellular, like this bacteria:
• OR an organism can be multicellular, like you!
STRUCTURE & FUNCTION• In organisms, structure and function are related. Structure = arrangement of parts in an organization -Includes the shape of a part and the material of which the part is made Function = the job that the part does
EXAMPLE OF STRUCTURE AND FUNCTION:The structure of the lungs is a large, spongy sac. Blood vessels wrap around aveoli (air sacs). The structure of the aveoli and blood vessels enable them to perform a function, which is bring oxygen into the body and take out carbon dioxide.
REVIEW:1. A ____________ is the most basic unit of all living things.2. The job that an organ does is the _________ of that organ.3. A group of cells working together to perform a specific function is a ______.