Grade 8 Science - Weeblyms-macdonald.weebly.com/uploads/2/4/1/0/24101186/science8_unit… · Grade...
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Grade 8 Science Chapter 11.notebook
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March 30, 2014
Grade 8 Science
Unit 4: Cells, Tissues, Organs, and SystemsChapter 11
Levels of Organization
Cells
Tissues
Organs
Organ Systems
Organisms
Grade 8 Science Chapter 11.notebook
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TissuesTissues are groups of similar cells that are found in all multicellular organisms
Examples:‐ Muscle tissue‐ Nerve tissue‐ Epithelial tissue
Organs Organs are groups of tissues, but are made up of two or more types of tissues
Organs are distinct structures that perform specific functions
Examples:‐ Lungs‐ Kidneys‐ Heart
SystemsAll systems have the following characteristics:
1) Made up of individual parts that work together as a whole2) Often connected to one or more systems3) If one part of a system is missing or damaged, the system will not function well or at all
Organ systems are a group of organs that perform activities that help the body as a whole
We will look at 6 organ systems:1) Digestive System2) Circulatory System3) Nervous System4) Respiratory System5) Excretory System6) Muscular System Read: Page 420‐423 and 426‐430
Bookwork: Page 425 ‐ 1, 3, 4, 7, 8
Grade 8 Science Chapter 11.notebook
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March 30, 2014
Digestive SystemFunction: to take in and break down food, absorb nutrients, and eliminate solid waste
Consists of:‐ Mouth‐ Gall Bladder‐ Small Intestine‐ Liver‐ Stomach‐ Large Intestine‐ Esophagus‐ Pancreas
Circulatory System
Function: to transport blood, nutrients (chemicals needed for survival), gases, and wastes
Consists of:‐ Heart‐ Veins‐ Arteries‐ Capillaries
Grade 8 Science Chapter 11.notebook
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March 30, 2014
Nervous System
Function: to detect changes in the environment and to signal these changes to the body which then carries out a response
Consists of:‐ Brain‐ Sense organs (eyes, ears, nose,tongue, skin)‐ Spinal cord‐ Nerves
Respiratory SystemFunction: to control breathing, and exchange gases in lungs and tissues
Consists of:‐ Nasal Cavity‐ Trachea‐ Lungs
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Excretory System
Function: to remove liquid and gases in lungs and tissues
Consists of:‐ Kidneys‐ Urinary Bladder
Muscular System
Function: to work with the bones to move body parts
Consists of: muscle tissue connected to bones throughout the body
Bookwork: Page 431 ‐ #'s 1‐6 Page 432 ‐ #'s 2, 6