Anatomy & Physiology: Unit Behavioral Objectives Study Guide

Introduction to the Human Body

Overview of Anatomy and Physiology

Anatomy and physiology are foundational sciences that explore the structure and function of the human body. Understanding these disciplines is essential for health science students.

• Anatomy: The study of body structure, including organs, tissues, and cells.

• Physiology: The study of how body parts function and interact.

• Directional Terms: Used to describe locations and positions (e.g., anterior, posterior, superior, inferior).

• Planes: Imaginary lines dividing the body (e.g., sagittal, frontal, transverse).

• Body Cavities: Spaces within the body that house organs (e.g., thoracic, abdominal, cranial).

• Homeostasis: The maintenance of a stable internal environment. Example: Regulation of body temperature.

• Negative Feedback Mechanisms: Processes that counteract changes to maintain equilibrium. Example: Blood glucose regulation.

• Levels of Organization: Chemical, cellular, tissue, organ, and organ system levels.

Chemical Level of Organization

Basic Chemistry and Biochemistry

The chemical level forms the foundation for all biological processes. It includes atoms, molecules, and macromolecules essential for life.

• Atoms and Elements: Basic units of matter (e.g., carbon, hydrogen, oxygen).

• Molecules and Compounds: Combinations of atoms (e.g., water, glucose).

• Inorganic vs. Organic Compounds: Inorganic compounds (e.g., water, salts) do not contain carbon-hydrogen bonds; organic compounds (e.g., carbohydrates, proteins) do.

• Water: Vital for chemical reactions, temperature regulation, and transport.

• Macromolecules: Carbohydrates, lipids, proteins, and nucleic acids. Example: Glucose (carbohydrate), DNA (nucleic acid).

• ATP (Adenosine Triphosphate): The primary energy carrier in cells. Equation: $\text{ATP} \rightarrow \text{ADP} + \text{P}_i + \text{Energy}$

Cellular Level of Organization

Cell Structure and Function

Cells are the basic units of life, each with specialized structures and functions.

• Cell Components: Plasma membrane, nucleus, cytoplasm, organelles (e.g., mitochondria, ribosomes, endoplasmic reticulum, Golgi apparatus, lysosomes).

• Membrane Transport: Diffusion, facilitated diffusion, osmosis, active transport.

• Osmosis: Movement of water across membranes from low to high solute concentration.

• Tonicity: Isotonic (equal solute), hypertonic (higher solute outside), hypotonic (lower solute outside).

• Cell Specialization: Cells differentiate to perform specific functions.

Tissue Level of Organization

Types and Functions of Tissues

Tissues are groups of similar cells performing common functions. There are four basic types: epithelial, connective, muscle, and nervous tissue.

• Epithelial Tissue: Covers surfaces, lines cavities, forms glands. Types: Simple, stratified, squamous, cuboidal, columnar.

• Connective Tissue: Supports, protects, binds other tissues. Examples: Bone, cartilage, adipose, blood.

• Muscle Tissue: Responsible for movement. Types: Skeletal, cardiac, smooth.

• Nervous Tissue: Conducts electrical impulses. Components: Neurons, neuroglia.

Integumentary System

Structure and Function of Skin

The integumentary system protects the body and regulates temperature. It includes the skin, hair, nails, and glands.

• Epidermis: Outer layer, provides barrier.

• Dermis: Inner layer, contains blood vessels, nerves, glands.

• Functions: Protection, sensation, thermoregulation, vitamin D synthesis.

• Accessory Structures: Hair, nails, sebaceous (oil) glands, sweat glands.

Skeletal System

Bone Structure and Function

The skeletal system provides support, protection, and movement. It consists of bones, cartilage, ligaments, and joints.

• Functions: Support, protection, movement, mineral storage, blood cell production.

• Bone Types: Long, short, flat, irregular, sesamoid.

• Bone Markings: Features for muscle attachment and articulation.

• Axial Skeleton: Skull, vertebral column, rib cage.

• Appendicular Skeleton: Limbs, girdles.

• Joints: Articulations between bones; classified by structure and function.

• Differences in Male and Female Pelvis: Female pelvis is wider for childbirth.

Articulations (Joints)

Classification and Movement

Joints connect bones and allow for movement. They are classified by structure and function.

• Structural Classification: Fibrous, cartilaginous, synovial.

• Functional Classification: Synarthrosis (immovable), amphiarthrosis (slightly movable), diarthrosis (freely movable).

• Synovial Joints: Most movable; contain synovial fluid.

• Types of Movements: Flexion, extension, abduction, adduction, rotation, circumduction.

• Example: Knee joint (hinge), shoulder joint (ball-and-socket).

Muscular System

Muscle Structure and Physiology

The muscular system enables movement, posture, and heat production. Muscles contract in response to stimuli.

• Muscle Cell Membrane: Sarcolemma; contains ion channels for contraction.

• Excitation-Contraction Coupling: Process linking nerve impulse to muscle contraction.

• Sliding Filament Theory: Actin and myosin filaments slide past each other to produce contraction.

• Motor Unit: A motor neuron and all the muscle fibers it innervates.

• Types of Contractions: Isotonic (change in length), isometric (no change in length).

• Muscle Fatigue: Decline in ability to generate force.

Nervous System

Organization and Function

The nervous system controls and coordinates body activities. It consists of the central and peripheral nervous systems.

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

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

• Neurons: Conduct impulses; types include sensory, motor, and interneurons.

• Neuroglia: Support cells.

• Reflex Arc: Pathway for reflexes; includes receptor, sensory neuron, integration center, motor neuron, effector.

• Synapse: Junction between neurons; neurotransmitters transmit signals.

• Action Potential: Electrical impulse along neuron membrane. Equation: $\text{Resting potential} \rightarrow \text{Depolarization} \rightarrow \text{Repolarization}$

Autonomic Nervous System (ANS)

Sympathetic and Parasympathetic Divisions

The ANS regulates involuntary functions such as heart rate, digestion, and respiratory rate.

• Sympathetic Division: Prepares body for 'fight or flight'.

• Parasympathetic Division: Promotes 'rest and digest'.

• Neurotransmitters: Acetylcholine, norepinephrine.

• Ganglia: Clusters of neuron cell bodies in the PNS.

• Visceral Reflexes: Automatic responses of internal organs.

Special Senses

Vision, Hearing, and Equilibrium

Special senses provide information about the environment. They include vision, hearing, taste, smell, and equilibrium.

• Eye Anatomy: Sclera, cornea, lens, retina, optic disc.

• Visual Pathway: Light passes through cornea, lens, vitreous humor, retina; signals sent via optic nerve.

• Ear Anatomy: External (auricle, auditory canal), middle (ossicles), inner (cochlea, semicircular canals).

• Hearing Pathway: Sound waves travel from auricle to tympanic membrane, ossicles, cochlea, organ of Corti.

• Equilibrium: Maintained by vestibular apparatus in inner ear.

Sample Table: Comparison of Tissue Types

Tissue Type	Main Function	Location Example
Epithelial	Protection, secretion, absorption	Skin, lining of GI tract
Connective	Support, binding, storage	Bone, blood, adipose
Muscle	Movement	Skeletal muscles, heart
Nervous	Communication, control	Brain, spinal cord

Additional info: Academic context and examples have been added to expand upon the behavioral objectives and make the notes self-contained for study purposes.