BIOLOGY 109: Comprehensive Study Guide for Anatomy and Physiology

Chapter 1: Introduction to Anatomy and Physiology

Subdivisions of Anatomy & Physiology

Anatomy is the study of the structure of body parts, while physiology focuses on their functions. Both are essential for understanding how the human body operates.

• Anatomy: Includes gross anatomy (structures visible to the naked eye), microscopic anatomy (cells and tissues), and developmental anatomy (changes throughout life).

• Physiology: Includes cellular, organ, and systemic physiology.

Body System Functions and Major Organs

The human body is organized into systems, each with specific functions and major organs.

• Examples: The cardiovascular system (heart, blood vessels), respiratory system (lungs, trachea), digestive system (stomach, intestines).

Directional Terms, Body Cavities, and Contents

Directional terms describe the location of structures. Body cavities house organs and protect them.

• Directional Terms: Anterior/posterior, superior/inferior, medial/lateral, proximal/distal.

• Body Cavities: Dorsal (cranial, vertebral), ventral (thoracic, abdominopelvic).

Homeostasis and Feedback Loops

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

• Negative Feedback: Reduces deviation from a set point (e.g., temperature regulation).

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

Example:

Thermoregulation via negative feedback: If body temperature rises, mechanisms such as sweating are activated to cool the body.

Chapter 2: The Chemistry of Life

Chemical Reactions

Chemical reactions are essential for life. Two key types are dehydration synthesis and hydrolysis.

• Dehydration Synthesis: Joins molecules by removing water.

• Hydrolysis: Breaks molecules by adding water.

pH and Organic Macromolecules

pH measures hydrogen ion concentration; organic macromolecules include carbohydrates, lipids, proteins, and nucleic acids.

• pH Formula: $\text{pH} = -\log_{10}[\text{H}^+]$

• Carbohydrates: Energy source (e.g., glucose).

• Lipids: Energy storage, membrane structure (e.g., triglycerides).

• Proteins: Structure, enzymes, transport (e.g., hemoglobin).

• Nucleic Acids: Genetic information (DNA, RNA).

Enzymes

Enzymes are biological catalysts that speed up reactions by lowering activation energy.

• Example: Amylase breaks down starch in saliva.

Chapter 3: The Cell

Organelle Functions

Cells contain organelles with specialized functions.

• Nucleus: Stores genetic material.

• Mitochondria: ATP production.

• Endoplasmic Reticulum: Protein and lipid synthesis.

• Golgi Apparatus: Modifies and packages proteins.

Membrane Transport Mechanisms

Substances move across cell membranes via passive and active transport.

• Passive Transport: Diffusion, osmosis, facilitated diffusion.

• Active Transport: Requires energy (e.g., sodium-potassium pump).

Cell Cycle and Mitosis

The cell cycle includes interphase and mitosis, leading to cell division.

• Mitosis Phases: Prophase, metaphase, anaphase, telophase.

Protein Synthesis

Protein synthesis involves transcription and translation.

• Transcription: DNA to mRNA in nucleus.

• Translation: mRNA to protein at ribosome.

Chapter 4: Histology

Structure and Functions of Tissue Types

Four basic tissue types: epithelial, connective, muscle, and nervous.

• Epithelial: Covers surfaces, lines cavities.

• Connective: Supports, binds, protects.

• Muscle: Movement.

• Nervous: Communication.

Membranes and Membrane-like Structures

Membranes include mucous, serous, cutaneous, and synovial types.

• Mucous Membranes: Line cavities open to exterior.

• Serous Membranes: Line closed cavities.

• Cutaneous Membrane: Skin.

• Synovial Membranes: Line joint cavities.

Chapter 5: The Integumentary System

Functions and Structure of Skin

The integumentary system protects, regulates temperature, and senses environment.

• Epidermis: Outer layer, protection.

• Dermis: Middle layer, strength, flexibility.

• Hypodermis: Deep layer, fat storage.

Accessory Structures

• Hair: Protection, sensation.

• Nails: Protection.

• Glands: Sweat and sebaceous glands for thermoregulation and lubrication.

Chapter 11: Nervous Tissue and Electrophysiology

Organization and Anatomy of Nervous System

The nervous system is divided into central and peripheral components.

• Neuron Anatomy: Cell body, dendrites, axon.

• Functional Classes: Sensory, motor, interneurons.

• Neuroglial Cells: Support and protect neurons.

Electrophysiology

Neurons transmit signals via changes in membrane potential.

• Resting Potential: $-70\text{ mV}$ maintained by ion gradients.

• Depolarization: Membrane potential becomes less negative.

• Repolarization: Return to resting potential.

• Hyperpolarization: Membrane potential becomes more negative.

Action Potential and Synapses

• Action Potential: Rapid change in membrane potential propagates along axon.

• Chemical Synapse: Neurotransmitter release.

• Electrical Synapse: Direct ion flow.

• EPSPs/IPSPs: Excitatory/Inhibitory postsynaptic potentials.

Chapter 12: Central Nervous System

Brain Anatomy and Functions

The brain consists of several regions with distinct functions.

• Cerebrum: Higher functions, sensory processing.

• Diencephalon: Thalamus, hypothalamus (relay, homeostasis).

• Brainstem: Midbrain, pons, medulla (basic life functions).

• Cerebellum: Coordination.

Spinal Cord Anatomy and Pathways

• Horns: Gray matter regions.

• Roots: Sensory (dorsal), motor (ventral).

• Rami: Branches of spinal nerves.

• Funiculi: Columns of white matter.

• Sensory Pathways: 1st, 2nd, 3rd order neurons.

• Motor Pathways: Upper and lower motor neurons.

Chapter 13: Peripheral Nervous System

Cranial and Spinal Nerves

The PNS includes cranial and spinal nerves, nerve plexuses, and sensory receptors.

• Cranial Nerves: 12 pairs, sensory and motor functions.

• Spinal Nerve Formation: Roots combine to form nerves.

• Nerve Plexuses: Networks (e.g., brachial, lumbar).

• Sensory Receptors: Detect stimuli (mechanoreceptors, thermoreceptors, etc.).

Reflex Arcs

• Stretch Reflex: Muscle contraction in response to stretching.

• Golgi Tendon Reflex: Prevents muscle damage.

• Flexor Reflex: Withdrawal from pain.

• Crossed Extensor Reflex: Maintains balance.

Chapter 14: Autonomic Nervous System

Comparison to Somatic Nervous System

The ANS controls involuntary functions; the somatic system controls voluntary movement.

• Parasympathetic Division: Rest and digest.

• Sympathetic Division: Fight or flight.

• Dual Innervation: Organs receive input from both divisions.

• Autonomic Tone: Baseline activity level.

Chapter 15: Special Senses

Anatomy and Physiology of Senses

Special senses include olfaction, gustation, vision, and hearing.

• Olfaction: Smell, olfactory epithelium.

• Gustation: Taste, taste buds.

• Vision: Eye anatomy, photoreceptors.

• Hearing: Ear anatomy, cochlea.

Chapter 16: Endocrine System

Hormones and Mechanisms

The endocrine system regulates physiology via hormones.

• Amino Acid-Based Hormones: Water-soluble, act via second messengers.

• Steroid Hormones: Lipid-soluble, act via intracellular receptors.

Major Hormones

Hormone	Origin	Primary Function	Stimulus for Release
Antidiuretic Hormone (ADH)	Posterior pituitary	Water retention	High plasma osmolarity
Growth Hormone (GH)	Anterior pituitary	Growth, metabolism	GHRH from hypothalamus
Thyroid Hormones (T3/T4)	Thyroid gland	Metabolic rate	TSH from pituitary
Aldosterone	Adrenal cortex	Na+ retention	Renin-angiotensin system
Cortisol	Adrenal cortex	Stress response	ACTH from pituitary
Epinephrine/Norepinephrine	Adrenal medulla	Fight or flight	Sympathetic stimulation
Erythropoietin	Kidneys	RBC production	Low O2
Renin-Angiotensin System	Kidneys/Liver	Blood pressure regulation	Low blood pressure
Natriuretic Peptides	Heart	Decrease blood pressure	High blood volume

Chapter 6: Bones and Bone Tissue

Functions and Anatomy of Bone

Bones provide support, protection, movement, mineral storage, and blood cell formation.

• Bone Anatomy: Diaphysis, epiphysis, marrow cavity.

Ossification

• Endochondral Ossification: Bone forms from cartilage.

• Intramembranous Ossification: Bone forms directly from mesenchyme.

Chapter 8: Articulations

Joint Types and Movements

Joints are classified by structure and function.

Structural Type	Functional Type	Example
Fibrous	Synarthrosis (immovable)	Sutures in skull
Cartilaginous	Amphiarthrosis (slightly movable)	Intervertebral discs
Synovial	Diarthrosis (freely movable)	Knee joint

• Basic Movements: Flexion, extension, abduction, adduction.

Chapter 10: Muscle Tissue and Physiology

Functions and Organization of Muscle

Muscle tissue enables movement, maintains posture, and produces heat.

• Organization: Muscle fiber, fascicle, muscle.

Excitation-Contraction Coupling and Contraction Cycle

• Excitation-Contraction Coupling: Action potential triggers Ca2+ release, leading to contraction.

• Contraction Cycle: Cross-bridge formation, power stroke, detachment, reactivation.

Tension Generation and Substrate Utilization

• Tension Generation: Depends on muscle fiber length, frequency of stimulation, and number of fibers activated.

• Substrate Utilization: ATP from creatine phosphate, glycolysis, aerobic respiration.

Types of Muscle Tissue

Type	Structure	Function
Skeletal	Striated, voluntary	Movement
Cardiac	Striated, involuntary	Pumps blood
Smooth	Non-striated, involuntary	Moves substances

Additional info: These notes expand on the study guide topics to provide a self-contained review for exam preparation, including definitions, examples, and tables for comparison and classification.