Chapter 1 – Language of Anatomy

Organization of the Human Body

The human body is organized hierarchically, from atoms to the entire organism. Understanding this structure is essential for studying anatomy and physiology.

• Levels of Organization: Atoms → Molecules → Cells → Tissues → Organs → Organ Systems → Organism

• Example: Oxygen atoms combine to form water molecules, which are essential for cellular function.

Regions and Terminology of Anatomy

Accurate anatomical terminology is crucial for describing locations and relationships in the body.

• Key Terms: Orbital (eye), antecubital (front of elbow), axillary (armpit), etc.

• Application: Use anatomical terms to answer questions about body regions and positions.

Serous Membranes

Serous membranes line body cavities and cover organs, reducing friction and providing protection.

• Types: Pleura (lungs), pericardium (heart), peritoneum (abdominal organs)

• Function: Secrete serous fluid for lubrication.

Anatomic Position

The anatomic position is a standard reference posture used to describe body parts and positions.

• Definition: Standing upright, facing forward, arms at sides, palms facing forward.

• Importance: Provides consistency in anatomical descriptions.

Homeostasis and Feedback Mechanisms

Homeostasis is the maintenance of a stable internal environment. Feedback mechanisms regulate physiological processes.

• Negative Feedback: Reverses a change to maintain balance (e.g., body temperature regulation).

• Positive Feedback: Enhances a change (e.g., blood clotting).

Characteristics of Living Things

Living organisms share several defining characteristics.

• Organization

• Metabolism

• Responsiveness

• Growth

• Development

• Reproduction

Chapter 2 – Chemistry

Carbohydrate Storage in the Human Body

Carbohydrates are stored primarily as glycogen in the liver and muscles.

• Glycogen: A polysaccharide serving as a form of energy storage.

• Function: Provides glucose during periods of fasting or increased energy demand.

Enzymes

Enzymes are biological catalysts that speed up chemical reactions in the body.

• Role: Lower activation energy for biochemical reactions.

• Example: Amylase breaks down starch into sugars.

Concentration Gradients

A concentration gradient is the difference in the concentration of a substance between two areas.

• Importance: Drives diffusion and other transport processes across membranes.

Functional Classifications of Proteins

Proteins are classified based on their functions in the body.

• Enzymatic: Catalyze reactions (e.g., lactase)

• Structural: Provide support (e.g., collagen)

• Transport: Carry substances (e.g., hemoglobin)

• Regulatory: Hormones (e.g., insulin)

Types of Chemical Reactions

Chemical reactions in the body include synthesis, decomposition, exchange, and redox reactions.

• Synthesis: Two or more substances combine to form a new compound.

• Decomposition: A compound breaks down into simpler substances.

• Exchange: Parts of molecules are exchanged to form new compounds.

• Redox: Involve transfer of electrons; oxidation is loss, reduction is gain of electrons.

pH and Buffers

pH measures the hydrogen ion concentration in a solution. Buffers help maintain stable pH in the body.

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

• Buffers: Substances that minimize changes in pH by absorbing or releasing H+ ions.

• Example: Bicarbonate buffer system in blood.

*Additional info: DNA & RNA are not included in this exam section.*

Chapter 3 – The Cell

Plasma Membrane Structure and Proteins

The plasma membrane is a selectively permeable barrier composed of a phospholipid bilayer with embedded proteins.

• Structure: Phospholipid bilayer, cholesterol, proteins (integral and peripheral), carbohydrates.

• Protein Types: Channel, carrier, receptor, enzymatic, structural.

Intercellular Junctions

Intercellular junctions connect adjacent cells and facilitate communication and adhesion.

• Tight Junctions: Prevent leakage between cells.

• Desmosomes: Provide mechanical strength.

• Gap Junctions: Allow passage of ions and small molecules.

Endocytosis and Exocytosis

Cells transport large molecules via endocytosis (into the cell) and exocytosis (out of the cell), both requiring ATP.

• Endocytosis: Includes phagocytosis (cell eating) and pinocytosis (cell drinking).

• Exocytosis: Vesicles fuse with the membrane to release contents outside the cell.

Cell Organelles and Functions

Organelles are specialized structures within cells, each with distinct functions.

• Nucleus: Contains genetic material.

• Mitochondria: Site of ATP production.

• Endoplasmic Reticulum: Protein and lipid synthesis.

• Golgi Apparatus: Modifies and packages proteins.

• Lysosomes: Digestive enzymes for breakdown of waste.

• Flagella and Microvilli: Movement and increased surface area, respectively.

Passive and Active Transport

Cells move substances across membranes via passive (no energy) and active (requires ATP) transport.

• Passive Transport: Diffusion, facilitated diffusion, osmosis.

• Active Transport: Uses ATP to move substances against concentration gradients.

Cell Division

Cell division includes mitosis and meiosis, but these are not included in the current exam section.

• Note: Tonicity, meiosis, and mitosis will not be on the exam.