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Harcourt Gr 5 Science Ch 1
Chapter 1 vocabulary
16
Science
5th Grade
11/01/2009

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Term
cell membrane
Definition
The thin covering that surrounds every cell.
Term
skeletal system
Definition
The organ system that protects the body and gives it structure.
Term
circulatory system
Definition
The organ system that transports oxygen, nutrients, and wastes throughout tyour body.
Term
muscular system
Definition
The organ system that includes muscles and tendons that move bones.
Term
organ
Definition
A group of tissues that work together to perform a certain function.
Term
cell
Definition
The basic unit of structure and function of all living things.
Term
nucleus
Definition
The part of a cell that directs all of the cell's activities.
Term
protist
Definition
A single-celled organism with a nucleus and organelles.
Term
respiratory system
Definition
The organ system that exchanges oxygen and carbon dioxide between the body and the environment.
Term
excretory system
Definition
The organ system that removes liquid waste from the body.
Term
digestive system
Definition
The organ system that turns food into nutrients for the body.
Term
nervous system
Definition
The organ system that senses your surroundings and controls other organs.
Term
cytoplasm
Definition
The jellylike material inside a cell between the cell membrane and the nucleus.
Term
tissue
Definition
A group of cells that work together to perform a certain function.
Term
microscopic
Definition
Too small to be seen without using a microscope.
Term
organ system
Definition
A group of organs that work together to do a job for the body.
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