Cell Theory

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Cell Theory:

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All living organisms are composed if cells. They may be unicellular or multicellular.

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Cell Theory:

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The cell is the basic unit of life.

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The last part of the cell theory is:

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Cells arise from pre-existing cells

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This involves interations between communities and their enviroment. Communities consist if different populations ( groups of organisms of the same species) in a given geographic area. The enviroment includes everything from people to plants. What is it?

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An Ecosystem

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An Organism is...

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An individual animal, plant, or single-celled life form.

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Systems which work together to keep the body functioning normally are...

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Organ Systems

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Organs are...

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colection of tissues joined in structural unit to serve a common function.

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Group of cells with both a shared structure and function:

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Tissues

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Cells:

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The basic structural unit of all organisms.

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The major role of this system is to provide support for the body, to protect delicate internal organs and to provide attachment sites for the organs. What is is?

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The Skeletal System

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What are some major organs of the skeletal system?

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Bones, cartilage, tendons and ligaments.

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The Muscular System:

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THe main role of the muscular system is to provede movement. Muscles work in pairs to move limbs and provide the orgaisms with mobility. Muscles also control the movement of materials through some organs, such as the stomach and intestine, and the heart and the circulator system.

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What are some mahor organs of the muscular system?

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Skeletal muscles and smooth muscles throughout the body.

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The Circulatory System:

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THe main role of the circulatory system is to transport nutrients, gases (such as oxygen and CO2), hormones and wastes throught the body.

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Major Organs of the Circulatory System:

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Heart, blood vessels and blood

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The Nervous System:

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THe main role of the nervous system is to relay electrical signals through the bode,direct behavior and movement, the endocrine system, and controls physiological processes such as digestion, circulation,etc.

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Nervous System Major Organs:

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Brain, Spinal Cord and Peripheral Nerves.

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Respiratory System:

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The main role is to provide gas echange between the blood and the enviroment.

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Respiratory System Major Organs:

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Nose, trachea and lungs

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Digestive System:

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The main role is to breakdown and absorb nutrients that are needed by the body

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Digestive System Major Organs:

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Moth, esophagus, stomach, small and large intestines

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The blueprint of life instructing sells how to develop and how to function. found in the nucleus of the cell

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DNA

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Gene:

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Sequence of DNA that determines a particular trait (hair color, eye color, etc.)

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Allele:

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Another name for gene

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Mor common gene ofr allele that over powers a recessive and shows up in a population more often

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Dominant gene/ allele

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Recessive gene/ allele:

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weaker, less common gene/ allele in a given pair

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Result of a cross of two parents:

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Offspring

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Gametes:

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Reproductive cells that contain one half of an individual's DNA (sperm- male, egg- female)

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The passage of genetic instructions from one generation to the next:

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Heredity

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Asexual Reproduction:

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Reproduction where an exact copy of the parent's genetic material is passed on to the offspring. Most common in one celled organisms.

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Sexual 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 enviroments.