Fundamental Chemistry Concepts for Anatomy & Physiology

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Basic Chemistry for Anatomy & Physiology

The human body is composed of various chemical elements, each playing a vital role in physiological processes.

Element: A pure substance consisting of only one type of atom.
Major Element: Elements that make up the majority of body mass (e.g., oxygen, carbon, hydrogen, nitrogen).
Mineral Element: Inorganic elements required by the body for normal function (e.g., calcium, potassium).
Trace Element: Elements needed in very small amounts (e.g., iron, zinc).

Examples of Elements: Oxygen, Carbon, Hydrogen, Nitrogen, Sodium, Potassium, Calcium, Chlorine, Magnesium, Phosphorus, Sulfur.

Atoms are the smallest units of matter that retain the properties of an element.

Nucleus: The central part of an atom containing protons and neutrons.
Electron Shell: Regions surrounding the nucleus where electrons are found.
Proton: Positively charged particle in the nucleus.
Neutron: Neutral particle in the nucleus.
Electron: Negatively charged particle orbiting the nucleus.
Atomic Number: Number of protons in an atom.
Periodic Table of the Elements: Organized chart of all known elements.
Chemical Symbol: One- or two-letter abbreviation for an element (e.g., H for hydrogen).
Valence Shell: The outermost electron shell.
Valence Electron: Electrons in the valence shell, important for chemical bonding.
Octet Rule: Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.
Duet Rule: For small atoms (like hydrogen and helium), stability is achieved with two electrons.

Chemical bonds are forces that hold atoms together in molecules and compounds.

Molecule: Two or more atoms bonded together.
Ionic Bond: Formed when electrons are transferred from one atom to another, creating ions.
Covalent Bond: Formed when atoms share electrons.
Ion: An atom or molecule with a net electric charge due to loss or gain of electrons.
Cation: Positively charged ion.
Anion: Negatively charged ion.
Hydrogen Bond: Weak attraction between a hydrogen atom and an electronegative atom (e.g., oxygen or nitrogen).

Example: Sodium chloride (NaCl) forms via ionic bonding between Na+ and Cl-.

Mixtures are combinations of two or more substances that are not chemically bonded.

Mixture: Physical combination of substances.
Suspension: Large particles settle out over time (e.g., blood cells in plasma).
Colloid: Particles are intermediate in size and do not settle (e.g., cytoplasm).
Solution: Homogeneous mixture where one substance dissolves in another (e.g., salt water).
Solute: Substance dissolved in a solution.
Solvent: Substance that dissolves the solute (water is the universal solvent).
Solubility: Ability of a substance to dissolve.
Concentration: Amount of solute in a given volume of solvent.

Water is essential for life, and substances interact with it in different ways.

Acids and bases are important for maintaining the body's pH balance.

Acid: Substance that releases hydrogen ions (H+) in solution.
Base: Substance that accepts hydrogen ions or releases hydroxide ions (OH-).
pH Scale: Measures the concentration of H+ ions; ranges from 0 (acidic) to 14 (basic).
Buffer: Substance that minimizes changes in pH.

Equation:

Organic compounds are carbon-based molecules essential for life.

Fatty Acid: Long hydrocarbon chain with a carboxyl group.
Saturated Fatty Acid: No double bonds; solid at room temperature.
Unsaturated Fatty Acid: One or more double bonds; liquid at room temperature.
Glycerol: Three-carbon backbone of triglycerides.
Triglyceride: Three fatty acids attached to glycerol; main form of stored fat.
Phospholipid: Major component of cell membranes; contains phosphate group.
Amphiphilic: Molecule with both hydrophilic and hydrophobic parts.
Steroid: Lipid with four fused rings (e.g., cholesterol).

Amino Acid: Building block of proteins; contains amino and carboxyl groups.
Core: Central carbon atom of an amino acid.
R Group: Side chain that determines amino acid properties.
Peptide: Short chain of amino acids.
Peptide Bond: Covalent bond between amino acids.
Dipeptide: Two amino acids joined by a peptide bond.
Tripeptide: Three amino acids joined together.
Polypeptide: Long chain of amino acids.
Fibrous Protein: Structural proteins (e.g., collagen).
Globular Protein: Functional proteins (e.g., enzymes, hemoglobin).
Protein Structure:
- Primary Structure: Sequence of amino acids.
- Secondary Structure: Local folding (e.g., alpha helix, beta-pleated sheet).
- Tertiary Structure: Three-dimensional folding of a polypeptide.
- Quaternary Structure: Association of multiple polypeptide chains.

Nucleotide: Monomer of nucleic acids; consists of a sugar, phosphate group, and nitrogenous base.
Pentose Sugar: Five-carbon sugar (ribose in RNA, deoxyribose in DNA).
Phosphate Group: Part of the nucleotide backbone.
Nitrogenous Base: Adenine, Guanine, Cytosine, Thymine (DNA), Uracil (RNA).
Deoxyribonucleic Acid (DNA): Stores genetic information.
Ribonucleic Acid (RNA): Involved in protein synthesis.
Adenosine Triphosphate (ATP): Main energy currency of the cell.
Adenosine Diphosphate (ADP): Formed when ATP loses a phosphate group.

Example: ATP hydrolysis releases energy for cellular processes.

Equation:

Type	Monomer	Polymer	Main Function
Carbohydrate	Monosaccharide	Polysaccharide	Energy source, structure
Lipid	Fatty acid, glycerol	Triglyceride, phospholipid	Energy storage, membranes
Protein	Amino acid	Polypeptide	Structure, enzymes, transport
Nucleic Acid	Nucleotide	DNA, RNA	Genetic information