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What are the six levels of organization?
chemical, cellular, tissues, organ, organ systems, and organism
molecules that combine together to create them. unit of structure and function of life
What are the most important chemicals for the human body?
Phosphorus, hydrogen, oxygen, nitrogen, calcium, carbon, and sulfur
What are the four types of tissues?
epithelium, nervous, connective, and muscle
What is an organ?
two or more tissues working together for a common function
What is an organ system?
several related organs working together for a common function
What are tissues?
group of structurally similar cells with a common function
What are important ions for the body?
calcium, sodium, hydrogen, potassium, and chloride
What are the two chemicals bonds most often found in the body?
ionic and covalent bonds
An ionic bond is.....
atom to atom transfer of electrons
A covalent bond is.......
sharing of electrons between two atoms
What is an organic substance?
covalently bonded carbon atoms (lipids, proteins, carbs, and nucleic acids)
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