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31 Cards in this Set
- Front
- Back
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all living organisms are composed of cells. They may be unicellular or multicelluler.
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cell theory
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the cell is the basic unit of life
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cell theory
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cells arise from pre-existing cells
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cell theory
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involve interactions between communities and their environment. communities consist if different populations in a live geographic area. the environment includes everything from people to plants
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ecosystem
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an individual animal, plant or single-celled life form
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organism
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systems which work together to keep the body functioning normally
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organ systems
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collection of tissues joined in stractural unit to serve a common function.
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organs
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group of cells with both a shared structure and function
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tissues
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the basic structural unit of all organisms
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cells
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provides support for the body, protects internal organs, provides attachment sites for organs
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skeletal system
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major organs are bones, cartilage, tendons and ligaments
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skeletal system
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provides movement. controls movement of matericals through some organs.
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muscular system
(muscles work in pairs to move limbs) |
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skeletal muscles and smooth muscles are major organs
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muscular system
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transports nutrients, gases (like CO2), hormones and wastes throughout the body
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circulatory system
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major organs are heart, blood vessels and blood
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circulatory system
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relays electrical signals through the body. directs behavior and movement and controls physiological processes
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nervous system
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major organs are brain, spinal cord and peripheral nerves
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nervous system
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provides gas exchange between the blood and environment
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respiratory system
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major organs are nose, trachea and lungs
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respiratory system
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breaks down and absorbs nutrients that are necessary for growth and maintenance.
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digestive system
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major organs are mouth, esophagus, stomach, small and large intestines
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digestve system
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the blueprint of life instructing cells how to develop and how to function. found in the nucleus of the cell.
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DNA
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sequence of DNA that determines a particular trait
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Gene
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another name for gene
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allele
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more common gene or allele that over powers a recessive and shows up in a population more often.
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dominant gene or allele
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weaker, less common gene in a pair
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recessive gene
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result of a cross of two parents
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offspring
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reproductive cells that contain one half of an individuals DNA (male is sperm female is egg)
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gametes
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the passage of genetic info through generations
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heredity
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reproduction where an exact copy of the parents genetic material is passed on to the offspring.
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asexual reproduction
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ability to generate extensive amounts of genetic diversity ability to produce variable offspring some of which will have improved chances of survival in changing environments
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sexual reproduction
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