Comprehensive Study Notes for Anatomy & Physiology I Final Exam

Chapter 1: Introduction to Anatomy and Physiology

Definition and Scope

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of the body and its parts.

Levels of Organization

• Organismal hierarchy: chemical → cellular → tissue → organ → organ system → organism.

• Tissue: Group of similar cells performing a specific function.

• Organ: Structure composed of at least two tissue types performing a specific function.

• Organ system: Group of organs working together for a common purpose.

Homeostasis

• Definition: Maintenance of a stable internal environment.

• Components: Stimulus, Receptor, Control Center, Effector, Response.

• Example: Body temperature regulation.

Feedback Mechanisms

• Negative feedback: Reduces or shuts off the original stimulus (e.g., body temperature, blood glucose).

• Positive feedback: Enhances the original stimulus (e.g., blood clotting, childbirth).

• Feedforward regulation: Anticipates changes (e.g., salivation before eating).

Chapter 2: The Chemistry of Life

Atoms, Ions, and Bonds

• Atoms: Smallest units of matter, composed of protons, neutrons, and electrons.

• Ions: Atoms that have gained or lost electrons (cations: +, anions: -).

• Ionic bonds: Electrons transferred from one atom to another.

• Covalent bonds: Atoms share electrons.

• Polar covalent bonds: Unequal sharing of electrons (e.g., H2O).

Organic vs. Inorganic Compounds

• Organic: Contains carbon and hydrogen (e.g., glucose C6H12O6).

• Inorganic: Usually lack carbon (e.g., water, salts).

Properties of Water

• Polarity, high heat capacity, solvent properties, cohesion, adhesion, and high density.

ATP: Cellular Energy Currency

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

$ext{ATP} ightarrow ext{ADP} + ext{P}_i + ext{energy released}$

Chapter 3: The Cell

Cell Structure and Function

• Plasma membrane: Phospholipid bilayer separating ICF from ECF; controls entry/exit of substances.

• Cytoplasm: Contains organelles and cytosol.

• Nucleus: Contains DNA, controls cell activity.

Membrane Transport

• Diffusion: Movement of molecules from high to low concentration.

• Osmosis: Movement of water across a selectively permeable membrane.

• Facilitated diffusion: Uses membrane proteins for transport.

• Active transport: Requires energy (ATP) to move substances against their gradient.

Organelles and Functions

• Mitochondria: Site of cellular respiration and ATP production.

• Ribosomes: Protein synthesis.

• Rough ER: Protein modification and transport.

• Golgi apparatus: Modifies, sorts, and packages proteins.

• Lysosomes: Digestion of cellular waste.

Cell Cycle and Division

• Phases: Interphase (G1, S, G2), Mitosis (prophase, metaphase, anaphase, telophase), Cytokinesis.

• Purpose: Growth, repair, and maintenance.

Chapter 4: The Integumentary System

Functions of the Integumentary System

• Protection, sensation, temperature regulation, vitamin D synthesis, excretion.

Skin Structure

• Epidermis: Stratified squamous epithelium; layers include stratum basale, spinosum, granulosum, lucidum (thick skin), corneum.

• Dermis: Papillary (areolar CT) and reticular (dense irregular CT) layers.

• Hypodermis: Adipose tissue, anchors skin to underlying structures.

Thick vs. Thin Skin

• Thick skin: Palms/soles, no hair, more layers.

• Thin skin: Covers most of body, has hair follicles.

Skin Color and Melanin

• Melanin: Pigment produced by melanocytes, protects against UV radiation.

• Differences in skin color due to amount and type of melanin produced.

Glands of the Skin

• Sudoriferous (sweat) glands: Eccrine (watery sweat), apocrine (milky, after puberty).

• Sebaceous glands: Secrete sebum (oil), lubricates skin/hair.

Chapter 6: Bones and Bone Tissue

Functions of the Skeletal System

• Support, protection, movement, mineral storage, blood cell formation (hematopoiesis), triglyceride storage.

Classification of Bones

• Long (e.g., femur), short (carpals), flat (sternum), irregular (vertebrae).

Bone Cells

• Osteogenic cells: Stem cells.

• Osteoblasts: Bone-forming cells.

• Osteocytes: Mature bone cells.

• Osteoclasts: Bone-resorbing cells.

Bone Structure

• Compact bone: Dense outer layer; contains osteons (Haversian systems).

• Spongy bone: Internal network of trabeculae.

Bone Formation

• Intramembranous ossification: Bone develops from fibrous membrane (e.g., skull bones).

• Endochondral ossification: Bone replaces hyaline cartilage (e.g., long bones).

Bone Remodeling and Homeostasis

• Influenced by hormones (PTH, calcitonin, vitamin D), physical activity, and diet.

• Imbalances can lead to osteoporosis, rickets, or other bone diseases.

Chapter 10: Muscle Tissue and Physiology

Functions of Skeletal Muscle

• Movement, posture, heat production, joint stabilization.

Muscle Fiber Structure

• Sarcomere: Functional unit of muscle contraction; contains actin (thin) and myosin (thick) filaments.

• Z lines: Define sarcomere boundaries.

Muscle Contraction

• Calcium binds to troponin, exposing binding sites on actin.

• Myosin heads bind to actin, forming cross-bridges, and pull actin filaments (power stroke).

• ATP is required for both contraction and relaxation.

Neuromuscular Junction

• Site where motor neuron communicates with muscle fiber via acetylcholine (ACh).

Types of Muscle Contractions

• Isotonic: Muscle changes length (concentric/eccentric).

• Isometric: Muscle length does not change.

ATP Generation in Muscle

• Creatine phosphate, anaerobic glycolysis, aerobic respiration.

Chapter 11: Introduction to the Nervous System and Nervous Tissue

Divisions of the Nervous System

• CNS: Brain and spinal cord.

• PNS: Cranial and spinal nerves.

Neurons and Neuroglia

• Neurons: Conduct impulses; have cell body, dendrites, axon.

• Neuroglia: Support, protect, and insulate neurons (e.g., astrocytes, oligodendrocytes, Schwann cells).

Membrane Potentials

• Resting membrane potential: -70 mV, maintained by Na+/K+ pump.

• Action potential: Rapid change in membrane potential; all-or-none response.

$ext{Na}^+$ influx causes depolarization, $ext{K}^+$ efflux causes repolarization$

Synaptic Transmission

• Neurotransmitters released from presynaptic neuron bind to receptors on postsynaptic cell.

• EPSP: Excitatory postsynaptic potential (depolarizes).

• IPSP: Inhibitory postsynaptic potential (hyperpolarizes).

Chapter 12: The Central Nervous System

Brain and Spinal Cord Structure

• Major regions: Cerebrum, diencephalon, brainstem, cerebellum.

• Spinal cord: Central canal, gray matter (horns), white matter (tracts).

• Protective layers: Dura mater, arachnoid mater, pia mater.

• CSF: Cushions and nourishes CNS.

Functional Areas

• Primary motor cortex: Voluntary movement.

• Primary sensory cortex: Receives sensory input.

Chapter 13: The Peripheral Nervous System

Peripheral Nerves and Sensory Receptors

• Somatic: Voluntary control of skeletal muscles.

• Autonomic: Involuntary control (sympathetic and parasympathetic divisions).

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

Chapter 14: The Autonomic Nervous System and Homeostasis

Sympathetic vs. Parasympathetic Divisions

• Sympathetic: "Fight or flight"; increases heart rate, dilates pupils, inhibits digestion.

• Parasympathetic: "Rest and digest"; decreases heart rate, stimulates digestion.

Neurotransmitters

• Sympathetic: Norepinephrine, epinephrine.

• Parasympathetic: Acetylcholine.

Chapter 16: The Endocrine System

Hormones and Glands

• Hormones: Chemical messengers secreted into the blood, regulate metabolism, growth, reproduction.

• Pituitary gland: Master gland; releases ACTH, TSH, GH, FSH, LH, PRL, ADH, oxytocin.

• Thyroid gland: Produces T3, T4 (regulate metabolism).

• Adrenal glands: Cortex (cortisol, aldosterone), medulla (epinephrine, norepinephrine).

• Pancreas: Insulin (lowers blood glucose), glucagon (raises blood glucose).

Hormonal Regulation

• Negative feedback: Most common mechanism (e.g., blood glucose regulation).

• Disorders: Hyperthyroidism, hypothyroidism, diabetes mellitus, Cushing's disease.

Effects of Hormones

• Regulate metabolism, growth, stress response, water/electrolyte balance, reproduction.

*Additional info: Some explanations and examples were expanded for clarity and completeness. Tables and diagrams referenced in the original were described in text for accessibility.*