Major Topics in Anatomy & Physiology

Introduction

This study guide consolidates essential terms, concepts, and unifying themes from a college-level Anatomy & Physiology course. It is organized by major physiological systems and processes, providing definitions, examples, and academic context to support exam preparation.

Cellular Structure and Function

Key Terms and Concepts

• Activation: The process by which a cell or molecule is stimulated to perform its function.

• Affinity: The strength of binding between a molecule and its ligand.

• Anabolism: The synthesis of complex molecules from simpler ones; requires energy.

• Catabolism: The breakdown of complex molecules into simpler ones; releases energy.

• ATP (Adenosine Triphosphate): The primary energy carrier in cells.

• Cell Membrane: A phospholipid bilayer that encloses the cell, controlling the movement of substances in and out.

• Diffusion: The passive movement of molecules from high to low concentration.

• Osmosis: The diffusion of water across a selectively permeable membrane.

• Exocytosis: The process by which cells expel materials in vesicles.

• Endocytosis: The process by which cells take in materials by engulfing them in vesicles.

Types of Membrane Transport

• Passive Transport: Includes diffusion, osmosis, and facilitated diffusion; does not require energy.

• Active Transport: Requires energy (usually ATP) to move substances against their concentration gradient.

• Example: Sodium-potassium pump ( ATPase) maintains cellular ion gradients.

Tissues and Organ Systems

Key Terms and Concepts

• Neural Tissue: Specialized for communication via electrical and chemical signals.

• Muscle Tissue: Responsible for movement; includes skeletal, cardiac, and smooth muscle.

• Connective Tissue: Provides support and structure; includes bone, blood, and adipose tissue.

• Epithelial Tissue: Covers body surfaces and lines cavities.

Organ Systems

• Organs: Structures composed of two or more tissue types that perform specific functions.

• Organ Systems: Groups of organs that work together to perform complex functions (e.g., digestive, respiratory, nervous systems).

Physiology of Excitable Tissues

Key Terms and Concepts

• Action Potential: A rapid change in membrane potential that propagates along excitable cells such as neurons and muscle fibers.

• Depolarization: The process by which the membrane potential becomes less negative.

• Repolarization: The return of the membrane potential to its resting state.

• Synapse: The junction between two neurons or between a neuron and an effector cell.

• Neurotransmitter: Chemical messengers released at synapses to transmit signals.

Example: Synaptic Transmission

• Neurotransmitters such as acetylcholine and dopamine bind to receptors on the postsynaptic cell, initiating a response.

Cardiovascular and Respiratory Systems

Key Terms and Concepts

• Heart Anatomy: Includes atria, ventricles, valves (e.g., mitral, tricuspid), and conduction system.

• Blood Vessels: Arteries, veins, capillaries; responsible for transporting blood throughout the body.

• Hemoglobin: Oxygen-carrying protein in red blood cells.

• Diaphragm: Major muscle of respiration.

• Gas Exchange: Occurs in alveoli of the lungs; oxygen enters blood, carbon dioxide is removed.

Example: Path of Blood Flow

• Blood flows from the right atrium to the right ventricle, then to the lungs via the pulmonary artery, returns to the left atrium, left ventricle, and is pumped to the body via the aorta.

Renal and Digestive Systems

Key Terms and Concepts

• Nephron: Functional unit of the kidney; responsible for filtering blood and forming urine.

• Glomerulus: Capillary network in the nephron where filtration occurs.

• Reabsorption: Movement of substances from the filtrate back into the blood.

• Secretion: Movement of substances from the blood into the filtrate.

• GI Tract: Includes mouth, esophagus, stomach, intestines; responsible for digestion and absorption of nutrients.

Example: Filtration Equation

• Glomerular Filtration Rate (GFR):

• Where is the filtration coefficient, is glomerular capillary pressure, is Bowman's space pressure, and is oncotic pressure in glomerular capillaries.

Endocrine and Reproductive Systems

Key Terms and Concepts

• Hormones: Chemical messengers secreted by endocrine glands; regulate physiological processes.

• Gonads: Ovaries and testes; produce gametes and sex hormones.

• Menstrual Cycle: Regular changes in female reproductive system; includes follicular, ovulation, and luteal phases.

• Fertilization: Fusion of sperm and egg to form a zygote.

• Placenta: Organ that nourishes the fetus during pregnancy.

Example: Hormonal Regulation

• Follicle Stimulating Hormone (FSH) and Luteinizing Hormone (LH) regulate gametogenesis and ovulation.

Immunity and Homeostasis

Key Terms and Concepts

• Innate Immunity: Non-specific defense mechanisms, such as barriers and phagocytes.

• Adaptive Immunity: Specific immune response involving lymphocytes (B cells and T cells).

• Homeostasis: Maintenance of a stable internal environment.

Example: Feedback Mechanisms

• Negative feedback: A process in which a change in a variable triggers a response that counteracts the initial change (e.g., regulation of blood glucose by insulin).

• Positive feedback: A process in which a change in a variable triggers a response that amplifies the change (e.g., oxytocin release during childbirth).

Comparisons and Classifications

Sample Table: Types of Membrane Transport

Additional info:

• Some terms and concepts have been expanded for clarity and completeness.

• Examples and equations have been added to illustrate key physiological processes.

• Table entries are inferred from standard academic knowledge of membrane transport.