Anatomy & Physiology 1 (BIOL 2401) Chapter 2

Chapter 2 Flash Cards for Lone Star College BIOL 2401 with Dr. Hoyer.  Summer 2010

91 cards   |   Total Attempts: 183
  

Cards In This Set

Front Back
All structures of life are ultimately composed of
Chemicals
Matter has ______ and takes up ________.
Mass, space
What is mass?
Amount of matter a substance contains
What is weight?
Force of gravity acting on a mass (can change depending on gravity).
The elements Oxygen, Carbon, Hydrogen and Nitrogen make up what percentage of living matter?
96%
What does the other 4% come from?
3.9% Calcium (Ca), Phosphorus (P), Potassium (K), Sulfur (S), Sodium (Na), Chlorine (Cl), Magnesium (Mg), Iodine (I), and Iron (Fe).

0.01% trace and ultratrace elements.
What is an atom?
An electrically neutral unit of matter of all elements.
What is the nucleus comprised of?
Protons and neutrons
How are the electrons positioned?
In energy level orbitals
If the number of protons equals the number of electrons, the atom is
Electrically neutral
What is an element?
A substance that is made entirely from one type of atom. (ex, hydrogen, gold, silver, copper, carbon)
The atomic number is
Is the number of protons found in the nucleus of an atom and therefore identical to the charge number of the nucleus
The mass number is
The total number of protons and neutrons in the nucleus
The atomic weight is
The average mass number of all natural isotopes.
What are bonds?
Links that attach atoms together