Human Anatomy and Physiology

  • ## Anatomy

    • The study of the structure of the body, including what it is made of and the location of components like bones, muscles, organs, and tissues.

  • ## Physiology

    • The study of how body parts work and function, focusing on how organs, systems, and cells work together to keep the body alive and healthy.

  • ## Key Concepts

    • ### 1. Diffusion

    • Definition: The movement of molecules from an area of high concentration to an area of low concentration until evenly distributed.

    • ### 2. Osmosis

    • Definition: A specific type of diffusion; the movement of water molecules through a semipermeable membrane from an area of low solute concentration to high solute concentration.

    • ### 3. Mitosis

    • Definition: The process by which a cell divides to make two identical cells, crucial for growth, healing, and replacement of old or damaged cells.

  • ## Chemistry

    • ### 1. Definition of Chemistry

    • The study of matter, including what it is made of, its structure, and how it changes or reacts with other substances.

    • ### 2. Atom

    • Definition: The smallest unit of matter that retains the properties of an element.

    • Parts of an Atom:

      • Nucleus: Contains protons and neutrons

      • Electron Cloud: Where electrons orbit the nucleus.

    • ### 3. Ion

    • Definition: An atom that has gained or lost electrons, resulting in a positive or negative charge.

    • ### 4. Molecule

    • Definition: Two or more atoms bonded together.

    • Example:

      • O2O_2 (oxygen gas)

      • H2OH_2O (water)

    • ### 5. Compound

    • Definition: A molecule made of two or more different kinds of atoms bonded together.

    • Example:

      • H2OH_2O (hydrogen and oxygen)

    • ### 6. Energy

    • Definition: The ability to perform work or cause change; essential for movement, growth, and body functions.

    • ### 7. Organic vs. Inorganic Chemicals

    • Organic Chemicals: Contain carbon and are generally produced by living creatures (e.g., proteins, fats, carbohydrates).

    • Inorganic Chemicals: Do not contain carbon (e.g., water, salts, minerals).

    • ### 8. Hydrotherapy

    • Definition: The use of water in various forms and temperatures for healing, relaxation, or therapeutic purposes.

    • ### 9. Organic Compound

    • Definition: A chemical compound that contains carbon, typically found in living organisms.

    • ### 10. Monosaccharide

    • Definition: The simplest form of carbohydrate, a simple sugar.

    • Examples: Glucose, Fructose.

    • ### 11. ATP (Adenosine Triphosphate)

    • Definition: The main energy molecule of the body; it stores and releases energy for cellular activities.

    • ### 12. RNA (Ribonucleic Acid)

    • Definition: A molecule that assists in protein synthesis and carries genetic information from DNA to cells.

    • ### 13. DNA (Deoxyribonucleic Acid)

    • Definition: The molecule that carries genetic instructions for growth, development, and reproduction; regarded as the blueprint of life.

    • ### 14. Lipids

    • Definition: Fats and oils that serve functions like energy storage, organ protection, and cell membrane structure.

    • ### 15. Proteins

    • Definition: Large molecules made from amino acids that are pivotal in building and repairing tissues, enzyme production, and supporting bodily functions.

  • ## Levels of Complexity in Living Matter

    • 1. Atom

    • 2. Molecule

    • 3. Cell

    • Basic functional unit of all living matter.

    • 4. Tissue

    • A collection of similar cells performing specific functions.

    • 5. Organ

    • A combination of tissues forming a complex structure for specific functions.

    • 6. Organ System

    • Several organs collaborating to effectuate a bodily function.

    • 7. Organism

    • The human body itself.

    • ### Examples of Organization

    • Organism: Human body

    • Organ Systems:

      • Respiratory system

      • Nervous system

      • Digestive system

      • Circulatory system

      • Skeletal system

      • Muscular system

      • Integumentary system

      • Endocrine system

      • Lymphatic system

      • Immune system

      • Urinary system

      • Reproductive system

    • Organs: Lung, brain, stomach, kidney

    • Tissues: Epithelial tissue, nervous tissue, muscle tissue, connective tissue

    • Cells: Epithelial cell, nerve cell, muscle cell

    • Organelles:

      • Mitochondrion

      • Structure: Double membrane, inner membrane folded into cristae.

      • Function: Powerhouse of the cell; produces ATP through cellular respiration.

      • Nucleus

      • Structure: Large, spherical organelle enclosed by a nuclear envelope with pores; contains chromatin (DNA).

      • Function: Controls cell activities by regulating gene expression; stores genetic information.

      • Ribosome

      • Structure: Small, granular structures composed of ribosomal RNA and protein; free in cytoplasm or attached to ER.

      • Function: Site of protein synthesis (translation).

      • Endoplasmic Reticulum (ER)

      • Structure: Network of membranous tubules and sacs (cisternae).

      • Function:

        • Rough ER: Studded with ribosomes; involved in synthesis and modification of proteins destined for secretion or insertion into membranes.

        • Smooth ER: Lacks ribosomes; involved in lipid synthesis, detoxification of drugs and poisons, and calcium ion storage.

      • Golgi Apparatus (Golgi Complex)

      • Structure: Stack of flattened membranous sacs (cisternae).

      • Function: Modifies, sorts, and packages proteins and lipids from the ER for secretion or delivery to other organelles.

      • Lysosome

      • Structure: Membranous sac containing hydrolytic enzymes.

      • Function: Digests waste materials and cellular debris, breaks down old or damaged organelles, and can destroy pathogens (cellular "recycling centers").

      • Peroxisome

      • Structure: Small, spherical organelles containing enzymes.

      • Function: Breaks down fatty acids and amino acids, detoxifies harmful substances, producing hydrogen peroxide as a byproduct which is then converted to water and oxygen.

      • Centrosome & Centrioles

      • Structure: Centrosome is near the nucleus, composed of two centrioles (barrel-shaped)

      • Function: Organize microtubules, act as the main microtubule-organizing center of animal cells; involved in cell division.

      • Cilium/Flagellum

      • Structure: Hair-like projections from cells, containing microtubules.

      • Function: Move fluids over the cell surface (cilia) or propel the cell through fluid (flagella, e.g., sperm tail).

      • Vacuoles/Vesicles

      • Structure: Membrane-bound sacs.

      • Function: Storage, transport, waste removal; especially prominent in plant cells (central vacuole for turgid pressure).

    • Molecules: Sugars, proteins

  • ## Anatomical Planes

    • Sagittal Plane: Divides the body into left and right sections.

    • Midsagittal (Median) Plane: Divides the body into equal left and right halves.

    • Parasagittal Plane: Divides the body into unequal left and right halves.

    • Frontal (Coronal) Plane: Divides the body into anterior (front) and posterior (back) sections.

    • Transverse (Horizontal) Plane: Divides the body into superior (upper) and inferior (lower) sections.

  • ## Body Cavities

    • Dorsal Cavity: Contains the central nervous system.

    • Cranial Cavity: Houses the brain.

    • Vertebral (Spinal) Cavity: Contains the spinal cord.

    • Ventral Cavity: Located at the anterior of the body, accommodating internal organs.

    • Thoracic Cavity: Superior portion, containing the heart and lungs.

    • Abdominopelvic Cavity: Inferior portion, further divided into:

      • Abdominal Cavity: Houses digestive organs like the stomach, liver, and intestines.

      • Pelvic Cavity: Contains reproductive organs, bladder, and rectum.

  • ## Healing Mechanisms

    • Inflammation: The body's immediate response to injury or infection, characterized by redness, swelling, heat, and pain; aims to protect and begin the healing process.

    • Tissue Repair: The process of replacing damaged or dead cells with new functional cells.

    • Regeneration: Replacement of destroyed tissue by the same kind of cells (e.g., skin, liver).

    • Fibrosis: Repair by dense connective tissue (scar tissue) when regeneration is not possible or insufficient (e.g., severe cuts, heart attack).

    • Phagocytosis: Process by which specialized cells (phagocytes) engulf and digest harmful particles, bacteria, and dead or dying cells.

    • Immune Response: The body's defense system against harmful substances, pathogens, and abnormal cells; involves specific cells and antibodies to identify and destroy threats.

  • ## Homeostasis

    • Definition: The internal balance of the body, which is crucial for health.

    • Role in Disease: Disruption in homeostasis leads to disease symptoms.

  • ## Signs and Symptoms of Disease

    • Disease: An abnormal state where the body cannot function normally.

    • Symptoms: Subjective evidence (e.g., dizziness, chills, nausea).

    • Signs: Observable indications (e.g., fever, abnormal pulse, skin discoloration).

  • ## Stress

    • Definition: Any psychological or physical situation causing tension or strain.

    • Effects on Health: Chronic stress can lead to various health issues including atherosclerosis and impaired immune function.

    • Physiological Response to Stress: Involves adrenal glands releasing hormones (e.g., adrenaline, cortisol) that prepare the body for fight or flight, affecting blood flow, muscle tension, and digestive rates.