Anatomy & Physiology: Foundational Concepts, Organic Chemistry, and Laboratory Skills

Inorganic Chemistry

Major Levels of Organization in Humans

The human body is organized into hierarchical levels, each with distinct structural and functional properties.

• Chemical Level: Atoms and molecules form the basis of all matter.

• Cellular Level: Cells are the basic units of life.

• Tissue Level: Groups of similar cells performing specific functions.

• Organ Level: Structures composed of different tissues working together.

• Organ System Level: Groups of organs performing complex functions.

• Organism Level: The complete living being.

Chemical Elements of the Human Body

Elements are pure substances consisting of only one type of atom. The human body is primarily composed of a few key elements.

• Major Elements: Oxygen (O), Carbon (C), Hydrogen (H), Nitrogen (N)

• Minor Elements: Calcium (Ca), Phosphorus (P), Potassium (K), Sulfur (S), Sodium (Na), Chlorine (Cl), Magnesium (Mg), Iron (Fe)

• Trace Elements: Required in minute amounts for proper physiological function.

Atomic Structure

Atoms consist of a nucleus (protons and neutrons) and electrons orbiting the nucleus.

• Protons: Positively charged particles in the nucleus.

• Neutrons: Neutral particles in the nucleus.

• Electrons: Negatively charged particles in orbitals around the nucleus.

Diagram: The Bohr model is commonly used to represent atomic structure.

Valence Electrons and Chemical Bonds

Valence electrons are the outermost electrons and determine an atom's chemical reactivity.

• Chemical Bonds: Formed by interactions between valence electrons.

• Ionic Bonds: Transfer of electrons between atoms.

• Covalent Bonds: Sharing of electrons between atoms.

• Hydrogen Bonds: Weak attractions between polar molecules.

Atoms, Molecules, and Compounds

Atoms combine to form molecules and compounds.

• Atom: Smallest unit of an element.

• Molecule: Two or more atoms bonded together.

• Compound: Molecule composed of different elements.

Forms of Energy

Energy is the capacity to do work. The body utilizes various forms of energy.

• Chemical Energy: Stored in chemical bonds.

• Electrical Energy: Movement of charged particles.

• Mechanical Energy: Movement of body parts.

• Radiant Energy: Energy carried by electromagnetic waves.

Chemical Reactions

Chemical reactions involve the making and breaking of chemical bonds.

• Synthesis: $A + B \rightarrow AB$

• Decomposition: $AB \rightarrow A + B$

• Exchange: $AB + CD \rightarrow AC + BD$

• Reversible Reactions: $A + B \rightleftharpoons AB$

Types of Chemical Bonds

Chemical bonds are essential for molecular structure and function.

• Ionic Bonds: Formed by transfer of electrons.

• Covalent Bonds: Formed by sharing electrons.

• Hydrogen Bonds: Weak bonds important in water and biological molecules.

Water and Its Properties

Water is vital for life due to its unique properties.

• High Heat Capacity: Absorbs and releases heat slowly.

• Polarity: Allows it to dissolve many substances.

• Cohesion and Adhesion: Enables transport in biological systems.

Acids, Bases, and Salts

Acids, bases, and salts are important for body function and homeostasis.

• Acids: Release hydrogen ions ($H^+$) in solution.

• Bases: Accept hydrogen ions or release hydroxide ions ($OH^-$).

• Salts: Ionic compounds formed from acid-base reactions.

pH and Buffer Systems

pH measures the concentration of hydrogen ions in a solution.

• pH Scale: Ranges from 0 (acidic) to 14 (basic), with 7 being neutral.

• Buffer Systems: Maintain stable pH in the body.

Equation: $pH = -\log[H^+]$

Inorganic vs. Organic Compounds

Compounds are classified based on their chemical structure.

• Inorganic Compounds: Usually lack carbon; examples include water, salts, acids, and bases.

• Organic Compounds: Contain carbon and hydrogen; examples include carbohydrates, lipids, proteins, and nucleic acids.

Organic Chemistry

Monomers, Polymers, and Chemical Reactions

Organic molecules are often polymers made from repeating monomer units.

• Monomer: Small molecule that can join with others to form polymers.

• Polymer: Large molecule made of repeating monomers.

• Polymerization: Chemical reaction that links monomers together.

Functional Groups

Functional groups are specific groups of atoms within molecules that determine chemical properties.

• Examples: Hydroxyl (-OH), Carboxyl (-COOH), Amino (-NH2), Phosphate (-PO4).

• Significance: Influence reactivity and interactions of organic molecules.

Monomers and Building Blocks

Biological macromolecules are built from specific monomers.

• Proteins: Built from amino acids.

• Carbohydrates: Built from monosaccharides (simple sugars).

• Lipids: Built from fatty acids and glycerol.

• Nucleic Acids: Built from nucleotides.

Functional Roles of Macromolecules

Each class of macromolecule has distinct functions in the body.

• Proteins: Enzymes, structural support, transport, signaling.

• Carbohydrates: Energy storage, structural components.

• Lipids: Energy storage, membrane structure, signaling.

• Nucleic Acids: Genetic information storage and transfer.

Protein Structure and Homeostasis

Protein function depends on its structure, which is organized into four levels.

• Primary Structure: Sequence of amino acids.

• Secondary Structure: Alpha helices and beta sheets.

• Tertiary Structure: Three-dimensional folding.

• Quaternary Structure: Association of multiple polypeptides.

• Homeostasis: Proper protein structure is essential for maintaining physiological balance.

Carbohydrates and Lipids

Carbohydrates and lipids are key sources of energy and structural components.

• Carbohydrates: Classified as monosaccharides, disaccharides, and polysaccharides.

• Lipids: Include triglycerides, phospholipids, and steroids.

Adenosine Triphosphate (ATP)

ATP is the primary energy carrier in cells.

• Structure: Adenine base, ribose sugar, three phosphate groups.

• Function: Provides energy for cellular processes.

Equation: $ATP \rightarrow ADP + P_i + \text{energy}$

Lab Skills

Laboratory Equipment and Measurement

Accurate measurement and use of laboratory equipment are essential for scientific investigation.

• Equipment: Graduated cylinders, pipettes, balances, thermometers.

• Measurement: Volume (liters), weight (grams), temperature (Celsius).

Metric System and Conversions

The metric system is used for scientific measurements. Conversion between units is often required.

• Length: Meter (m)

• Mass: Gram (g)

• Volume: Liter (L)

• Temperature: Celsius (°C)

Conversion Example: $1 \text{cm}^3 = 1 \text{mL}$

Organic Compound Modeling

Modeling and drawing organic compounds helps visualize molecular structure.

• Ball-and-stick models: Represent atoms and bonds.

• Structural formulas: Show arrangement of atoms.

Vocabulary and Word Meanings

Understanding scientific vocabulary is crucial for effective communication in anatomy and physiology.

• Use context clues: Analyze word roots, prefixes, and suffixes.

• Application: Use vocabulary in lab reports and discussions.