Lecture Notes on Medical Science Origin and Anatomy/Physiology

Historical Perspective
- Early healing practices often termed as magic.
- Current healing therapies might still involve superstitions (e.g., "old wives' tales").
Audience Engagement
- Question: How many people have burnt themselves and been advised to use mustard or butter?
- Personal anecdote: Reference to husband advocating mustard for burns.

Definitions
- Anatomy: Study of structures.
- Physiology: Study of functions of structures.
Transition to Levels of Organization
- Importance of levels of organization is fundamental to the course framework.

Atom: Smallest unit of matter, not considered a living organism.
- Definition of living vs non-living.
Molecule: Formed when two or more atoms bond.
Macromolecule: Large molecule; includes significant biological molecules.
- Four major biomolecules in human anatomy:
  - Carbohydrates
  - Proteins
  - Lipids
  - Nucleic Acids
Organelle: Subunit of a cell, named as it serves organ-like functions for the cell.
Cell: Smallest living unit, fulfills requirements for life.
Tissue: Group of similar cells working for a shared function.
Organ: Structurally distinct group of tissues working together.
Organ System: Group of organs that work together.
Organism: Complete living entity.

Homeostasis: The maintenance of a stable internal environment, which is not the same as equilibrium.
Cell Interdependence: Cells depend on each other and have specialized functions based on distinct structures (Structure determines function).

Permeability: Refers to a cell membrane's ability to allow substances to pass through.
- Selective Permeability: Cell membranes regulate what enters/exits.
Cellular Differentiation: All body cells have the same DNA; however, differences arise from gene expression.

Cell Communication: Achieved via chemical signaling.
- Example: Neurons releasing neurotransmitters to relay signals.
Feedback Loops: Two types (positive and negative).
- Positive Feedback Loop: Amplification of conditions (example: childbirth and oxytocin).
- Negative Feedback Loop: Reversal of a condition (example: temperature regulation).

Two Main Regions:
- Axial Region: Central axis of the body (includes head, neck, and trunk).
- Appendicular Region: Limbs (arms and legs).
Body Cavities:
- Cranial Cavity: Contains the brain.
- Spinal Cavity: Houses the spinal cord.
- Thoracic Cavity: Contains pleural cavity (lungs) and pericardial cavity (heart).
- Abdominal-Pelvic Cavity: Houses digestive and reproductive organs.
Serous Membranes: Double-layered membranes lining cavities and organs.
- Visceral Membrane: Contacts the organ.
- Parietal Membrane: Lines the cavity.

Integumentary System: Skin; protects against external damage and regulates temperature.
Skeletal System: Framework for body; site of blood cell synthesis.
Muscular System: Facilitates movement and generates heat.
Nervous System: Central for transmitting signals and regulating homeostasis.
Endocrine System: Hormones regulation.
Cardiovascular System: Heart and blood vessels for transportation of nutrients and oxygen.
Lymphatic System: Fluid regulation and immune responses.
Digestive System: Breaks down and absorbs nutrients.
Respiratory System: Gas exchange.
Urinary System: Waste removal and water balance.
Reproductive System: Production of new organisms.
Life span changes in systems as a focus, particularly in older age.

Standard Anatomical Position: Feet forward, palms facing forward, arms at sides.
Anatomical Terms of Location:
- Superior: Closer to the head.
- Inferior: Closer to the feet.
- Medial: Closer to the midline.
- Lateral: Away from the midline.
- Proximal: Closer to limb attachment.
- Distal: Further from limb attachment.
- Anterior (Ventral): Front of the body; Posterior (Dorsal): Back of the body.

Recommendations for student engagement with anatomical terms and regions via practical activities, such as labeling exercises.