Fundamental Concepts in Chemistry and Biochemistry for Anatomy & Physiology

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2.1 Matter is the Stuff of the Universe and Energy Moves Matter

Introduction

Matter and energy are foundational concepts in anatomy and physiology, underlying all biological processes. Understanding their forms and interactions is essential for studying the human body.

Matter: Anything that has mass and occupies space. All living and non-living things are composed of matter.
Energy: The capacity to do work or cause change. Energy exists in various forms and is required for all physiological processes.
Potential Energy: Stored energy due to position or structure (e.g., chemical bonds).
Kinetic Energy: Energy of motion (e.g., movement of muscles, flow of blood).
Major Energy Forms: Chemical, electrical, mechanical, and radiant energy.
Example: The chemical energy stored in glucose is converted to kinetic energy during muscle contraction.

2.2 The Properties of an Element Depend on the Structure of Its Atoms

Introduction

Elements are pure substances consisting of only one type of atom. The structure of atoms determines the properties of each element.

Chemical Element: A substance that cannot be broken down into simpler substances by ordinary chemical means (e.g., oxygen, carbon).
Atoms: The smallest units of elements, composed of subatomic particles:
- Protons: Positively charged, found in the nucleus.
- Neutrons: No charge, found in the nucleus.
- Electrons: Negatively charged, orbit the nucleus.
Atomic Number: Number of protons in the nucleus; defines the element.
Mass Number: Sum of protons and neutrons.
Example: Carbon has 6 protons, 6 neutrons, and 6 electrons.

2.3 Atoms Bound Together Form Molecules; Different Molecules Can Make Mixtures

Introduction

Atoms combine to form molecules, which can further interact to create mixtures with varying properties.

Molecule: Two or more atoms chemically bonded together (e.g., H2O).
Compound: A molecule containing atoms of different elements (e.g., NaCl).
Mixtures: Physical combinations of substances without chemical bonding.
Types of Mixtures:
- Solutions: Homogeneous mixtures (e.g., salt water).
- Colloids: Heterogeneous mixtures with larger particles (e.g., cytosol).
- Suspensions: Heterogeneous mixtures with visible particles that settle (e.g., blood).
Example: Blood is a suspension, plasma is a colloid, and saline is a solution.

2.4 The Three Types of Chemical Bonds Are Ionic, Covalent, and Hydrogen

Introduction

Chemical bonds hold atoms together in molecules and compounds, influencing the properties and functions of substances in the body.

Ionic Bonds: Formed when electrons are transferred from one atom to another, creating charged ions (e.g., NaCl).
Covalent Bonds: Formed when atoms share electrons (e.g., H2O).
Hydrogen Bonds: Weak attractions between a hydrogen atom and an electronegative atom (e.g., between water molecules).
Role in Biology: These bonds determine molecular structure, stability, and interactions.
Example: DNA strands are held together by hydrogen bonds.

2.5 Chemical Reactions Occur When Electrons Are Shared, Gained, or Lost

Introduction

Chemical reactions involve the making or breaking of bonds, resulting in new substances. These reactions are fundamental to metabolism and physiology.

Types of Chemical Reactions:
- Synthesis (Anabolism): Two or more substances combine to form a more complex product.
- Decomposition (Catabolism): A complex substance breaks down into simpler parts.
- Exchange: Parts of molecules are exchanged to form new products.
Factors Affecting Reaction Rates: Temperature, concentration, particle size, catalysts (e.g., enzymes).
Example: Cellular respiration is a series of decomposition and exchange reactions.

PART 2: BIOCHEMISTRY

2.6 Inorganic Compounds Include Water, Salts, and Many Acids and Bases

Introduction

Inorganic compounds are essential for physiological processes, including maintaining homeostasis and enabling biochemical reactions.

Water: Most abundant inorganic compound; solvent, temperature regulator, and reactant.
Salts: Ionic compounds that dissociate in water to form electrolytes (e.g., NaCl).
Acids and Bases: Acids release H+ ions; bases release OH- ions. The balance between them is measured by pH.
pH Concept:
Homeostasis: The body maintains a stable pH (around 7.4 in blood) for proper function.
Example: Bicarbonate buffer system regulates blood pH.

2.8 Carbohydrates Provide an Easily Used Energy Source for the Body

Introduction

Carbohydrates are organic molecules that serve as the primary energy source for most cells.

Monosaccharides: Simple sugars (e.g., glucose, fructose).
Disaccharides: Two monosaccharides joined (e.g., sucrose, lactose).
Polysaccharides: Long chains of monosaccharides (e.g., glycogen, starch).
Biological Function: Provide energy, store energy (glycogen), and serve as structural components (cell membranes).
Example: Glucose is metabolized to produce ATP.

2.9 Lipids Insulate Body Organs, Build Cell Membranes, and Provide Stored Energy

Introduction

Lipids are diverse organic compounds that play structural, energy storage, and regulatory roles in the body.

Types of Lipids: Triglycerides (fats), phospholipids, steroids (e.g., cholesterol).
Functions: Energy storage, insulation, protection, and forming cell membranes.
Example: Phospholipids are the main component of the plasma membrane.

2.11 DNA and RNA Store, Transmit, and Help Express Genetic Information

Introduction

Nucleic acids are macromolecules that store and transmit genetic information, essential for inheritance and protein synthesis.

DNA (Deoxyribonucleic Acid): Double-stranded, stores genetic information.
RNA (Ribonucleic Acid): Single-stranded, involved in protein synthesis.
Comparison Table:

Feature	DNA	RNA
Strands	Double	Single
Sugar	Deoxyribose	Ribose
Bases	A, T, C, G	A, U, C, G
Function	Genetic storage	Protein synthesis

Example: mRNA carries genetic code from DNA to ribosomes for protein synthesis.

2.12 ATP Transfers Energy to Other Compounds

Introduction

ATP (adenosine triphosphate) is the primary energy carrier in cells, enabling metabolic processes.

ATP Structure: Adenine base, ribose sugar, and three phosphate groups.
Role in Metabolism: Hydrolysis of ATP releases energy for cellular work.
Equation:
Example: Muscle contraction and active transport use ATP as an energy source.