Unit 2: Homeostasis / Water

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Acid

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30 Terms
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Acid

A solution that measures less than 7 on the pH scale

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Base

A solution that measures more than 7 on the pH scale

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External

the outer surface of something (in this case, the body)

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Feedback regulation

A control mechanism that uses the end result to regulate the rate of a process

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Homeostasis

internal stability or "steady state" maintained by the body

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Internal

the inner surface of something (in this case, the body)

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Negative feedback

A type of regulation that responds to a change in conditions by initiating responses that counteract or reverse the change

<p>A type of regulation that responds to a change in conditions by initiating responses that counteract or reverse the change</p>
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pH scale

The range of numbers used to describe how acidic a solution is

<p>The range of numbers used to describe how acidic a solution is</p>
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Positive feedback

A response to change when the stimulus increases the original stimulus

<p>A response to change when the stimulus increases the original stimulus</p>
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Response

A reaction (to a stimulus)

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Stimulus

An environmental change that triggers a response

<p>An environmental change that triggers a response</p>
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Adhesion

attraction between unlike molecules

<p>attraction between unlike molecules</p>
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Atom

smallest particle of an element

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Cohesion

tendency of molecules of the same kind to stick to one another

<p>tendency of molecules of the same kind to stick to one another</p>
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Compound

substance containing two or more elements chemically combined in a fixed ratio

<p>substance containing two or more elements chemically combined in a fixed ratio</p>
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Covalent bond

chemical bond that forms when two atoms share electrons

<p>chemical bond that forms when two atoms share electrons</p>
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Electron

subatomic particle with a single unit of negative charge

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Hydrogen bond

bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule

<p>bond created by the weak attraction of a slightly positive hydrogen atom to a slightly negative portion of another molecule</p>
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Ion

Atom that has become electrically charged as a result of gaining or losing electrons

<p>Atom that has become electrically charged as a result of gaining or losing electrons</p>
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Ionic bond

Chemical bond that occurs when an atom transfers an electron to another atom

<p>Chemical bond that occurs when an atom transfers an electron to another atom</p>
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Molecule

two or more atoms held together by covalent bonds

<p>two or more atoms held together by covalent bonds</p>
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Neutron

subatomic particle that has no charge (electrically neutral)

<p>subatomic particle that has no charge (electrically neutral)</p>
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Nucleus (of an atom)

The central core that contains protons and neutrons

<p>The central core that contains protons and neutrons</p>
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Polar molecule

molecule in which opposite ends have opposite charges

<p>molecule in which opposite ends have opposite charges</p>
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Proton

subatomic particle with a single unit of positive electric charges

<p>subatomic particle with a single unit of positive electric charges</p>
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Solute

substance in a solution that is dissolved and is present in a lesser amount

<p>substance in a solution that is dissolved and is present in a lesser amount</p>
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Solution

uniform mixture of two or more substances

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Solvent

substance in a solution that dissolves the other substance and is present in greater amount

<p>substance in a solution that dissolves the other substance and is present in greater amount</p>
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surface tension

A measure of how difficult it is to stretch or break the surface of a liquid

<p>A measure of how difficult it is to stretch or break the surface of a liquid</p>
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nonpolar

equal sharing of electrons

<p>equal sharing of electrons</p>
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