BIOH 104 Final Exam Study Guide: Anatomy & Physiology Core Topics

Final Exam Overview

This study guide outlines the major topics and subtopics covered in a college-level Anatomy & Physiology course, providing a structured overview for exam preparation. Each section summarizes essential concepts, definitions, and examples relevant to human body systems and their physiological functions.

Homeostasis, Positive and Negative Feedback

Definitions and Mechanisms

• Homeostasis: The maintenance of a stable internal environment within the body despite external changes.

• Negative Feedback: A control mechanism that reduces the output or activity of any organ or system back to its normal range. Example: Regulation of body temperature.

• Positive Feedback: A mechanism that amplifies a response or activity. Example: Blood clotting cascade.

Key Terms: stimulus, receptor, effector, control center.

Chemistry

Atoms, Molecules, and Compounds

• Atom: The basic unit of matter, composed of protons, neutrons, and electrons.

• Molecule: Two or more atoms bonded together.

• Compound: A substance formed from two or more different elements chemically bonded.

• Dehydration Synthesis: Chemical reaction that joins molecules by removing water.

• Hydrolysis: Chemical reaction that breaks molecules apart by adding water.

Example: Formation and breakdown of carbohydrates in the human body.

Cells and Tissues

Cellular Structures and Functions

• Organelles: Specialized structures within cells (e.g., nucleus, mitochondria, plasma membrane).

• Plasma Membrane: Semi-permeable barrier controlling entry and exit of substances.

• Cytoskeleton: Network of fibers providing structural support.

• Cell Junctions: Connections between cells, including tight junctions, desmosomes, and gap junctions.

Example: Epithelial tissue junctions in the skin.

Tissues

Types and Characteristics

• Epithelial Tissue: Covers body surfaces and lines cavities.

• Connective Tissue: Supports, binds, and protects organs.

• Muscle Tissue: Responsible for movement.

• Nervous Tissue: Transmits electrical impulses.

Example: Structure and function of cardiac muscle tissue.

Skin and Body Membranes

Structure and Function

• Body Membranes: Include cutaneous (skin), mucous, serous, and synovial membranes.

• Functions: Protection, secretion, absorption, and sensation.

Example: Serous membrane lining the thoracic cavity.

The Skeletal System and Bone

Cells, Functions, and Bone Types

• Bone Cells: Osteocytes, osteoblasts, osteoclasts.

• Functions: Support, protection, movement, mineral storage.

• Types of Bone Growth: Interstitial (lengthwise) vs. appositional (widthwise).

• Calcium Homeostasis: Regulation of blood calcium levels; responses to hypocalcemia and hypercalcemia.

• Bone Anatomy: Structures such as epiphysis, diaphysis, osteon, canaliculi, lamellae.

Example: Fracture healing process.

The Muscular System

Muscle Structure and Contraction

• Microanatomy: Skeletal muscle fibers, myofibrils, sarcomeres.

• Contraction Process: Sliding filament theory; actin and myosin interaction.

• Fiber Types: Slow twitch vs. fast twitch fibers.

• Muscle Roles: Prime mover, antagonist, synergist.

Example: Biceps brachii as a prime mover in elbow flexion.

The Nervous System

Organization and Function

• Central Nervous System (CNS): Brain and spinal cord.

• Peripheral Nervous System (PNS): Nerves outside the CNS.

• Autonomic Nervous System: Sympathetic and parasympathetic divisions.

• Action Potential: Electrical signal transmission along neurons.

• Synapse: Junction between neurons for signal transmission.

Example: Reflex arc pathway.

The Digestive System

Processes and Enzymes

• Catabolism: Breakdown of molecules for energy.

• Anabolism: Synthesis of complex molecules.

• Accessory Organs: Liver, pancreas, gallbladder.

• Digestive Enzymes: Amylase, protease, lipase.

Example: Digestion of carbohydrates in the small intestine.

The Cardiovascular System

Heart and Blood Vessels

• Arteries, Capillaries, Veins: Structure and function.

• Cardiac Cycle: Sequence of events in one heartbeat.

• Cardiac Output: $\text{Cardiac Output} = \text{Heart Rate} \times \text{Stroke Volume}$

• ECG: Electrocardiogram, measures electrical activity of the heart.

• Regulation: Intrinsic and extrinsic mechanisms controlling heart rate.

Example: Blood flow through the heart chambers.

Blood

Components and Functions

• Leukocytes: White blood cells; types include neutrophils, lymphocytes, monocytes, eosinophils, basophils.

• Hemostasis: Process of blood clotting.

• Erythropoietin: Hormone stimulating red blood cell production.

Example: Immune response to infection.

The Respiratory System

Gas Exchange and Regulation

• pH Regulation: Maintained by respiratory and renal systems.

• Gas Exchange: Oxygen and carbon dioxide transport in blood.

• Surfactant: Substance reducing surface tension in alveoli.

Example: Oxygen diffusion across the respiratory membrane.

Immune and Lymphatic Systems

Defense Mechanisms

• Lymphatic Organs: Lymph nodes, spleen, thymus.

• Innate Immunity: Non-specific defenses (e.g., skin, phagocytes).

• Adaptive Immunity: Specific defenses (e.g., antibodies, T cells).

• Antibodies: Proteins targeting specific antigens.

Example: Immune response to vaccination.

The Urinary System

Excretion and Homeostasis

• Organs: Kidneys, ureters, bladder, urethra.

• Nephron: Functional unit of the kidney.

• Water Conservation: Regulation of water and solute balance.

Example: Filtration and reabsorption in the nephron.

The Endocrine System

Hormones and Disorders

• Hormones: Chemical messengers produced by endocrine glands.

• Mechanisms: Activation of second messenger systems.

• Disorders: Diabetes mellitus, diabetes insipidus, hyperthyroidism, hypothyroidism, Cushing's disease, Addison's disease.

Example: Insulin regulation of blood glucose.

System	Main Function	Key Components
Skeletal	Support, protection, movement	Bones, ligaments, cartilage
Muscular	Movement, posture, heat production	Skeletal muscles, tendons
Nervous	Control, communication	Brain, spinal cord, nerves
Cardiovascular	Transport of nutrients and gases	Heart, blood vessels
Respiratory	Gas exchange	Lungs, trachea, bronchi
Digestive	Breakdown and absorption of food	Stomach, intestines, liver
Urinary	Excretion, water balance	Kidneys, bladder
Endocrine	Regulation via hormones	Glands (pituitary, thyroid, etc.)
Immune/Lymphatic	Defense against pathogens	Lymph nodes, spleen

Additional info: This guide is based on a comprehensive final exam outline and covers all major chapters listed in a standard Anatomy & Physiology curriculum. Students should review each system's structure, function, and key processes for exam success.