Anatomy & Physiology: Foundational Concepts and The Cell – Study Guide

Chapter 1 – Language of Anatomy

Introduction to Anatomical Organization

This chapter introduces the structural organization of the human body, from the smallest chemical units to the complete organism. Understanding anatomical terminology and the characteristics of living things is essential for further study in anatomy and physiology.

• Levels of Organization: The human body is organized hierarchically: atoms → molecules → organelles → cells → tissues → organs → organ systems → organism.

• Anatomical Regions: Mastery of anatomical terms (e.g., orbital, antecubital, axillary) is required for accurate description and communication. Example: The antecubital region refers to the front of the elbow.

• Serous Membranes: These are thin membranes lining body cavities and covering organs (e.g., pleura, pericardium, peritoneum). They reduce friction and compartmentalize organs.

• Anatomic Position: The standard reference position for the body in anatomy: standing upright, facing forward, arms at sides, palms facing forward.

• Homeostasis: The maintenance of a stable internal environment. Involves feedback mechanisms (primarily negative feedback) to regulate variables such as temperature and pH.

• Characteristics of Living Things: Includes organization, metabolism, responsiveness, growth, development, reproduction, and adaptation.

Chapter 2 – Chemistry

Biochemical Foundations of the Human Body

This chapter covers the chemical principles underlying physiological processes, including the storage of carbohydrates, enzyme function, and the classification of biomolecules.

• Carbohydrate Storage: Carbohydrates are stored in the human body primarily as glycogen in the liver and muscles.

• Enzymes: Biological catalysts that speed up chemical reactions without being consumed. They lower the activation energy required for reactions.

• Concentration Gradients: The difference in concentration of a substance across a space or membrane. Drives passive transport processes such as diffusion.

• Functional Classification of Proteins: Proteins can be classified by their function, such as enzymes, structural proteins, transport proteins, and antibodies.

• Types of Chemical Reactions:

  • Synthesis (Anabolic): Two or more substances combine to form a more complex product. Example: $A + B \rightarrow AB$

  • Decomposition (Catabolic): A complex molecule breaks down into simpler substances. Example: $AB \rightarrow A + B$

  • Exchange: Parts of molecules are exchanged to form new compounds. Example: $AB + CD \rightarrow AD + CB$

  • Redox (Oxidation-Reduction): Involves the transfer of electrons between molecules. Oxidation is loss of electrons; reduction is gain of electrons.

• pH and Buffers: pH measures hydrogen ion concentration; buffers help maintain stable pH by neutralizing acids and bases. Example: The bicarbonate buffer system in blood.

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

Chapter 3 – The Cell

Structure and Function of the Cell

This chapter explores the structure of the plasma membrane, types of proteins, and mechanisms of cellular transport and communication.

• Plasma Membrane Structure: Composed of a phospholipid bilayer with embedded proteins, cholesterol, and carbohydrates. Functions as a selective barrier.

• Membrane Proteins: Include integral (span the membrane) and peripheral (attached to the surface) proteins. Functions: transport, receptors, enzymes, cell recognition.

• Intercellular Junctions: Structures that connect adjacent cells, including tight junctions, desmosomes, and gap junctions.

• Endocytosis and Exocytosis: Processes for moving large molecules into (endocytosis) and out of (exocytosis) the cell. Both require ATP.

• Organelles: Specialized structures within cells, such as the nucleus (genetic control), mitochondria (ATP production), lysosomes (digestion), and others.

• Flagella and Microvilli: Flagella enable cell movement (e.g., sperm), while microvilli increase surface area for absorption (e.g., intestinal cells).

• Passive and Active Transport:

  • Passive Transport: Movement of substances down their concentration gradient without energy input (e.g., diffusion, osmosis, facilitated diffusion).

  • Active Transport: Movement of substances against their concentration gradient, requiring ATP (e.g., sodium-potassium pump).

Additional info: Tonicity, Meiosis, and Mitosis are not included in this exam section.