BIO 4 Introductory Human Anatomy - Unit 1 Overview

Course Foundations and Metric Standards

• Success Markers: Knowledge transferrable to California State University and University of California. Lab assessment focuses on exact identification and spelling of structures from designated worksheets.
• Grading Components: Course includes 5 Lecture Midterms, 5 Practical Midterms, a 100-point Final Exam, weekly quizzes, and class participation via formative assessments.
• Metric Units of Measure:
  • Length: Meter ($m$), centimeter ($1/100\,m$), millimeter ($1/1000\,m$), and micrometer ($1/1,000,000\,m$).
  • Mass: Gram ($g$), kilogram ($1000\,g = 2.2\,lbs$).
  • Volume: Liter ($L$), milliliter ($ml = 1/1000\,L$).

Anatomical Terminology and Orientation

• Anatomical Position: A standard reference where the person stands erect, feet flat, eyes forward, and palms facing forward with thumbs pointing away.
• Body Regions:
  • Axial: Includes the Cephalic (head), Cervical (neck), and Trunk (Thoracic, Abdominal, Pelvic, Pubic, and Dorsum).
  • Appendicular: Upper limbs (Brachial/arm, Antebrachial/forearm) and lower limbs (Femoral/thigh, Crural/leg).
• Directional Terms:
  • Superior (Cranial) / Inferior (Caudal): Above or below.
  • Anterior (Ventral) / Posterior (Dorsal): Front or back.
  • Medial / Lateral: Towards or away from the midline.
  • Proximal / Distal: Closer to or farther from the limb attachment point.
  • Superficial / Deep: Towards or away from the body surface.
• Body Planes:
  • Sagittal: Divides into right and left; includes Midsagittal (midline) and Parasagittal (offset).
  • Frontal (Coronal): Divides into anterior and posterior parts.
  • Transverse: Horizontal section dividing into superior and inferior.

Hierarchy of Organization and Body Systems

• Structural Levels: Chemical (atoms/molecules) → Cellular → Tissue → Organ → Organ system → Organismal.
• Human Body Plan: Characterized by bilateral symmetry, a tube-within-a-tube construction, a dorsal hollow nerve cord, and segmentation.
• Organ Systems: Includes Integumentary, Skeletal, Muscular, Nervous, Endocrine, Cardiovascular, Lymphatic, Respiratory, Digestive, Urinary, and Reproductive systems.
• Body Cavities:
  • Dorsal: Contains Cranial and Vertebral cavities.
  • Ventral: Divided by the Diaphragm into Thoracic (Pleural and Pericardial) and Abdominopelvic (Abdominal and Pelvic) cavities.

Cellular Biology and Organelles

• Main Components: Plasma membrane (outer boundary), Cytoplasm (organelles/cytosol), and Nucleus (control center containing DNA).
• Plasma Membrane: Follows the fluid mosaic model; a selectively permeable lipid bilayer with integral and peripheral proteins.
• Cytoplasmic Organelles:
  • Ribosomes: Protein synthesis sites.
  • Endoplasmic Reticulum (ER): Rough ER (protein manufacturing) and Smooth ER (lipid synthesis).
  • Golgi Apparatus: Sorts, packages, and ships proteins.
  • Mitochondria: Energy production via ATP; contains maternal DNA.
  • Lysosomes and Peroxisomes: Waste digestion and toxic chemical neutralization.
  • Cytoskeleton: Network of Microtubules, Microfilaments, and Intermediate filaments for structural support.

Membrane Transport and Cell Dynamics

• Transport Mechanisms:
  • Passive: Simple diffusion, Facilitated diffusion, and Osmosis (water movement).
  • Active: Requires ATP to move solutes against gradients.
  • Vesicular: Endocytosis (Phagocytosis, Pinocytosis, Receptor-mediated) and Exocytosis.
• Cell Life Cycle:
  • Interphase: Growth and DNA replication ($G_1, S, G_2$ phases).
  • Mitosis: Partitioning DNA into two nuclei via Prophase, Metaphase, Anaphase, and Telophase.
  • Cytokinesis: Division of the cytoplasm into two daughter cells.

Epithelial Tissue and Histology

• Tissue Definition: Similar cells and products working together for a common function.
• Histology Techniques: H&E staining uses Hematoxylin (stains nuclei purple/blue) and Eosin (stains cytoplasm pink/orange).
• General Epithelia Characteristics: Cellular sheets with an apical (free) surface and a basal surface resting on a basement membrane.
• Specific Epithelial Types:
  • Simple Squamous: Single layer of flat cells (e.g., lung air sacs, kidney glomeruli).
  • Simple Cuboidal: Cube-shaped cells for secretion (e.g., kidney tubules).
  • Simple Columnar: Tall cells with Goblet cells for mucus secreting (e.g., digestive tract).
  • Pseudostratified Columnar: Cells of different heights, often ciliated (e.g., trachea).
  • Stratified Squamous: Multi-layered for protection (e.g., skin, esophagus).
  • Transitional: Stretchable dome-shaped cells (e.g., urinary bladder).

Microscope Operation and Imaging

• Microscopy Fundamentals: Total Magnification ($TM$) equals Ocular power ($10\times$) multiplied by Objective power ($5\times, 10\times, 40\times, 63\times$).
• Field of View (FOV): The visible circular area through the oculars; area decreases as magnification increases.
• Medical Imaging Modalities:
  • X-ray: Visualizes dense structures like bone.
  • Computed Tomography (CT): Detailed cross-sectional X-ray images.
  • Angiography (DSA): Highlights blood vessels with contrast medium.
  • PET Scan: Detects radioactive isotopes to monitor metabolism.
  • Sonography (Ultrasound): Uses high-frequency sound waves; common for fetal imaging.
  • Magnetic Resonance Imaging (MRI): High-quality soft tissue imaging based on water content.