Chapter 1 – Language of Anatomy

Organization of the Human Body

The human body is organized from the smallest units (atoms) up to the entire organism. Understanding this hierarchy is essential for studying anatomy and physiology.

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

• Example: Muscle cells form muscle tissue, which makes up organs like the heart.

Regions of Anatomy

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

• Key Terms: Orbital (eye region), Antecubital (front of elbow), Axillary (armpit), etc.

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

Serous Membranes

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

• Types: Pleura (lungs), Pericardium (heart), Peritoneum (abdominal organs)

• Function: Reduce friction between organs and cavity walls.

Anatomic Position

The standard reference position for anatomical terminology is the anatomic position.

• 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: Reduces the effect of a stimulus (e.g., body temperature regulation).

• Positive Feedback: Enhances the effect of a stimulus (e.g., blood clotting).

• Example Equation:

Characteristics of Living Things

Living organisms share several defining characteristics.

• Key Characteristics: Metabolism, responsiveness, growth, reproduction, movement, cellular organization.

Chapter 2 – Chemistry

Carbohydrate Storage in the Human Body

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

• Glycogen: A polysaccharide that serves as a storage form of glucose.

Enzymes

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

• Function: Lower activation energy, increase reaction rate.

• Example: Amylase breaks down starch into sugars.

Concentration Gradients

A concentration gradient is the difference in the concentration of a substance across a space.

• Importance: Drives diffusion and transport processes in cells.

Functional Classification of Proteins

Proteins are classified based on their functions in the body.

• Types: Structural (collagen), enzymatic (amylase), transport (hemoglobin), regulatory (hormones).

Types of Chemical Reactions

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

• Synthesis:

• Decomposition:

• Exchange:

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

pH and Buffers

pH measures the hydrogen ion concentration; buffers help maintain stable pH in the body.

• pH Scale:

• Buffers: Substances that resist changes in pH (e.g., bicarbonate buffer system).

Chapter 3 – The Cell

Plasma Membrane Structure and Proteins

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

• Proteins: Integral (span membrane), peripheral (surface), serve as channels, receptors, enzymes.

Intercellular Junctions

Intercellular junctions connect cells and facilitate communication.

• Types: Tight junctions, desmosomes, gap junctions.

Endocytosis and Exocytosis

Cells transport large molecules via endocytosis (into cell) and exocytosis (out of cell), processes that require ATP.

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

• Exocytosis: Releases substances from the cell.

• Equation:

Cell Organelles and Functions

Organelles perform specialized functions within the cell.

• Nucleus: Contains genetic material.

• Mitochondria: Site of ATP production.

• Endoplasmic Reticulum: Protein and lipid synthesis.

• Golgi Apparatus: Modifies and packages proteins.

Cilia, Flagella, and Microvilli

Cell surface structures aid in movement and absorption.

• Cilia: Move substances across cell surfaces.

• Flagella: Propel cells (e.g., sperm).

• Microvilli: Increase surface area for absorption.

Passive Transport and ATP Use

Cells use passive and active transport mechanisms to move substances.

• Passive Transport: Does not require ATP (e.g., diffusion, osmosis).

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

Cell Division

Cell division includes processes such as mitosis and meiosis, but these will not be covered on the exam.

• Note: Tonicity, meiosis, and mitosis are excluded from the exam content.