Anatomy & Physiology: Foundational Concepts and Review for Test One

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Foundational Concepts in Anatomy & Physiology

Key Terms and Definitions

This section introduces essential vocabulary and concepts that form the basis of anatomy and physiology. Understanding these terms is crucial for mastering the subject and preparing for exams.

Homeostasis: The process by which living organisms maintain a stable internal environment despite changes in external conditions.
Viscera: The internal organs within the main cavities of the body, especially those in the abdomen.
Anatomy: The study of the structure of body parts and their relationships to one another.
Hemolysis: The destruction of red blood cells, leading to the release of hemoglobin into the blood plasma.
Negative Feedback: A control mechanism in which a change in a physiological variable triggers a response that counteracts the initial change, maintaining homeostasis.
Collagen Fibers: Strong, flexible protein fibers found in connective tissue, providing structural support.
Keratin: A tough, fibrous protein found in skin, hair, and nails, providing protection and strength.
Exocytosis: The process by which cells expel materials in vesicles to the outside environment.
Extracellular Fluid (Interstitial Fluid): The fluid found outside cells, providing nutrients and removing waste.
DNA Polymerase: An enzyme that synthesizes DNA molecules from nucleotides during DNA replication.
Physiology: The study of the functions and mechanisms occurring in living organisms.
Serous Membrane: Thin membranes lining body cavities not open to the outside, secreting serous fluid for lubrication.
Facilitated Diffusion: Passive movement of molecules across cell membranes via transport proteins.
Phagocytosis: The process by which cells engulf and digest large particles or microorganisms.
Avascular: Lacking blood vessels.
Vitamin D3: A vitamin produced in the skin in response to sunlight, important for calcium absorption.
Cutaneous Membrane: The skin; covers the body surface.
Osmosis: The diffusion of water across a selectively permeable membrane.
Hypertonic vs. Hypotonic: Solutions with higher (hypertonic) or lower (hypotonic) solute concentrations compared to another solution.
Pinocytosis: The process by which cells ingest extracellular fluid and its dissolved solutes.
Receptor: A protein that binds specific molecules, triggering a cellular response.
Hemidesmosome: A structure that anchors epithelial cells to the basement membrane.
Melanocyte: A cell that produces melanin, the pigment responsible for skin color.
Perichondrium: A layer of dense connective tissue surrounding cartilage.
Lymph: Fluid that circulates in the lymphatic system, involved in immune responses.
Endocytosis: The process by which cells take in materials by engulfing them in vesicles.
Fibroblasts: Cells that produce collagen and other fibers in connective tissue.
Histology: The study of tissues at the microscopic level.
Phospholipid: A major component of cell membranes, consisting of a hydrophilic head and hydrophobic tails.
Codon (Triplet of Bases): A sequence of three nucleotides in mRNA that specifies an amino acid.
Translation: The process of synthesizing proteins from mRNA in the ribosome.

Levels of Organization and Functions

Levels of Organization in the Human Body

The human body is organized into hierarchical levels, each with specific functions and characteristics.

Chemical Level: Atoms and molecules essential for life.
Cellular Level: Cells, the basic units of life.
Tissue Level: Groups of similar cells performing a common function.
Organ Level: Structures composed of two or more tissue types working together.
Organ System Level: Groups of organs that perform related functions.
Organism Level: The complete living being.

Main Functions of Living Things

Metabolism: All chemical reactions in the body.
Responsiveness: Ability to sense and respond to stimuli.
Movement: Motion of the body, organs, and cells.
Growth: Increase in size and number of cells.
Reproduction: Production of new cells or organisms.
Differentiation: Specialization of cells for specific functions.

Tissue Types and Their Properties

Primary Tissue Types

The body consists of four primary tissue types, each with distinct functions.

Epithelial Tissue: Covers body surfaces and lines cavities; involved in protection, absorption, and secretion.
Connective Tissue: Supports, binds, and protects organs; includes bone, cartilage, blood, and adipose tissue.
Muscle Tissue: Responsible for movement; includes skeletal, cardiac, and smooth muscle.
Nervous Tissue: Conducts electrical impulses; found in the brain, spinal cord, and nerves.

Homeostatic Mechanisms

Homeostasis is maintained through feedback systems that regulate physiological variables.

Negative Feedback: Reduces the effect of the initial stimulus, maintaining stability. Example: Regulation of body temperature.
Positive Feedback: Enhances the initial stimulus, leading to an amplified response. Example: Blood clotting.

Cell Structure and Function

Parts of the Cell and Their Functions

Nucleus: Contains genetic material (DNA); controls cell activities.
Plasma Membrane: Regulates entry and exit of substances.
Cytoplasm: Site of metabolic reactions.
Organelles: Specialized structures (e.g., mitochondria, ribosomes) with specific functions.

Cellular Transport Mechanisms

Diffusion: Movement of molecules from high to low concentration.
Osmosis: Movement of water across a membrane.
Facilitated Diffusion: Passive transport via membrane proteins.
Active Transport: Movement against concentration gradient using energy.
Endocytosis: Uptake of materials via vesicles.
Exocytosis: Release of materials via vesicles.

Membranes and Skin Structure

Types of Membranes

Cutaneous Membrane: The skin; protects the body.
Serous Membrane: Lines body cavities; secretes serous fluid.
Mucous Membrane: Lines cavities open to the exterior; secretes mucus.

Skin Layers and Components

Epidermis: Outermost layer; provides protection.
Dermis: Middle layer; contains connective tissue, blood vessels, and nerves.
Hypodermis: Deepest layer; stores fat and anchors skin.
Keratinocytes: Main cells in the epidermis; produce keratin.
Melanocytes: Produce melanin pigment.

Connective Tissue and Cartilage

Connective Tissue Components

Fibroblasts: Produce fibers and ground substance.
Collagen Fibers: Provide strength.
Elastic Fibers: Provide flexibility.
Fixed Cells: Cells that remain in the tissue and perform maintenance functions.

Types of Cartilage

Hyaline Cartilage: Most common; provides support and flexibility.
Elastic Cartilage: Contains elastic fibers; found in ear and epiglottis.
Fibrocartilage: Contains dense collagen fibers; found in intervertebral discs.

Protein Synthesis and Cell Division

Steps of Protein Synthesis

Transcription: DNA is used to synthesize mRNA in the nucleus.
Translation: mRNA is decoded by ribosomes to assemble amino acids into proteins.

mRNA Sequencing: mRNA codons pair with tRNA anticodons (A-U, T-A, G-C).

Steps of Cellular Division

Mitosis: Division of the nucleus into two identical daughter cells.
Cytokinesis: Division of the cytoplasm.

Summary Table: Types of Tissues

Type	Main Function	Location
Epithelial	Protection, absorption, secretion	Skin, lining of organs
Connective	Support, binding, protection	Bones, cartilage, blood
Muscle	Movement	Skeletal muscles, heart, walls of organs
Nervous	Conduct impulses	Brain, spinal cord, nerves

Additional info:

Some terms and questions were inferred from context and standard Anatomy & Physiology curriculum.
For equations related to diffusion and osmosis, the following formula is commonly used: where is the flux, is the diffusion coefficient, and is the concentration gradient.
For homeostasis, the general feedback loop can be represented as: