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29 Cards in this Set
- Front
- Back
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cell theory
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1. All living things are made of one or more cells.
2. The cell is the basic unit of life. 3. All cells come from other cells. |
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bacteria
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smallest organism on earth - one celled organism
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cell membrane
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helps control what enters and leaves a cell
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nucleus
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controls most of the cell's activities
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vacuole
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stores food, water, minerals, and wastes
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cytoplasm
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gelatinlike substance that contains many chemicals that the cell needs
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mitochondrion
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converts food energy into a form that the cell can use
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chromosomes
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in the nucleus - contain DNA
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DNA
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a chemical that determines which traits an organism will have
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cell wall
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provides support and protection
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chloroplast
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captures energy from sunlight and uses it to convert carbon dioxide and water into food
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photosynthesis
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how plants, algae, and many bacteria make their food - occurs in leaf cells
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cellular respiration
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the energy cells need to function comes from cellular respiration
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nerve cells
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receive and deliver messages quickly
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skin cells
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form protective layer for body
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fat cells
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store fat
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muscle cells
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many long fibers that can contract and relax
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tissues
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groups of similar cells that do the same work
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organ
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different types of tissue working together form a structure - your heart is an organ
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organ system
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a group of organs working together to do a job - stomach, mouth, intestines, etc. make up digestive system
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skeletal system
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all the bones in your body - gives shape and support (bones)
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skin
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largest human body organ
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muscular system
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framework for body - makes all movement possible (muscles)
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digestive system
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takes in food and breaks it down so that the nutrients can be absorbed by the body (stomach, intestines, etc.)
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urinary system
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removes extra water, salts, and wastes from blood (kidneys, bladder)
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respiratory system
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moves oxygen into the body and waste gases out of the body (lungs, trachea, etc.)
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circulatory system
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moves nutrients and oxygen to cells and removes wastes (heart, blood, blood vessels)
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nervous system
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control system of body - sends messages - made up of brain, spinal cord, nerves
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reproductive system
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organs and structures in males and females that allow humans to reproduce
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