Ch 1. Introduction

Overview of Anatomy and Physiology

Anatomy and physiology are foundational sciences in understanding the structure and function of the human body. Anatomy focuses on the physical structures, while physiology examines how these structures operate and interact.

• Anatomy: Study of body structures and their relationships.

• Physiology: Study of body functions and mechanisms.

• Gross Anatomy: Structures visible to the naked eye.

• Microscopic Anatomy: Structures requiring magnification (e.g., cells, tissues).

Levels of Organization

The human body is organized into hierarchical levels, each building upon the previous.

• Chemical Level: Atoms and molecules

• Cellular Level: Cells and their organelles

• Tissue Level: Groups of similar cells

• Organ Level: Structures composed of multiple tissue types

• Organ System Level: Groups of organs working together

• Organismal Level: The complete living being

Anatomical Position and Body Regions

Standard anatomical position is used as a reference for describing locations and directions on the body.

• Body Regions: Specific areas such as head, neck, trunk, limbs.

• Directional Terms: Used to describe relative positions:

  • Anterior/Posterior

  • Superior/Inferior

  • Cranial/Caudal

  • Medial/Lateral

  • Ventral/Dorsal

  • Proximal/Distal

  • Superficial/Deep

Body Planes and Cavities

Body planes are imaginary lines used to divide the body for anatomical study.

• Sagittal Plane: Divides body into left and right (mid- and para-sagittal).

• Transverse Plane: Divides body into superior and inferior parts.

• Frontal/Coronal Plane: Divides body into anterior and posterior parts.

• Body Cavities: Spaces within the body that contain organs (e.g., thoracic, abdominal).

Ch 2. Cells

Cell Structure and Function

Cells are the basic units of life, each containing specialized organelles that perform distinct functions.

• Plasma Membrane: Encloses the cell, regulates entry/exit of substances.

• Functions of Plasma Membrane: Protection, communication, transport.

Cytoplasmic Organelles

Organelles are specialized structures within cells, each with unique roles.

• Nucleus: Contains genetic material (DNA).

• Rough Endoplasmic Reticulum (RER): Protein synthesis.

• Smooth Endoplasmic Reticulum (SER): Lipid synthesis and detoxification.

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

• Secretory Vesicles: Transport substances out of the cell.

• Lysosomes: Digestive enzymes for breakdown of waste.

• Peroxisomes: Breakdown of fatty acids and detoxification.

• Mitochondria: ATP production (cellular energy).

• Centrioles: Cell division (mitosis).

• Cilia and Flagella: Movement of cells or substances.

Cell Life Cycle

Cells undergo a cycle of growth and division, essential for development and repair.

• Protein Synthesis: DNA is transcribed to RNA, which is translated to protein.

• Cell Division: Includes mitosis (nuclear division) and cytokinesis (cytoplasmic division).

Equation for Protein Synthesis:

Ch 3. Embryology

Stages of Embryonic Development

Embryology studies the development of an organism from fertilization to birth.

• Zygote: Fertilized egg cell.

• Fertilization: Fusion of sperm and egg.

• Blastocyst: Early stage with a fluid-filled cavity.

• Implantation: Attachment of blastocyst to uterine wall.

• Embryo: Developing organism up to 8 weeks.

• Fetus: Developing organism from 9 weeks to birth.

Ch 4. Tissues

Types and Functions of Tissues

Tissues are groups of similar cells performing specific functions. There are four primary tissue types in the human body.

• Epithelial Tissue: Covers surfaces, lines cavities, forms glands.

• Connective Tissue: Supports, binds, and protects organs.

• Muscle Tissue: Responsible for movement.

• Nervous Tissue: Transmits electrical impulses.

Membranes

Membranes are thin layers of tissue covering surfaces or lining cavities.

• Serous Membranes: Line body cavities not open to the outside.

• Mucous Membranes: Line cavities open to the exterior.

Ch 5. Integumentary System

Structure and Function of the Skin

The integumentary system includes the skin and its accessory structures, providing protection and sensory functions.

• Skin: Largest organ, acts as a barrier.

• Accessory Structures: Hair, nails, glands.

• Dermis: Middle layer, contains connective tissue, blood vessels, nerves.

• Hypodermis: Deepest layer, stores fat and insulates.

Accessory Structures

Accessory structures of the skin have specialized functions.

• Hair: Protection, sensory input.

• Nails: Protect fingertips, aid in grasping.

• Glands: Sebaceous (oil) and sweat glands regulate moisture and temperature.

Example: Sweat glands help regulate body temperature through evaporation.

Additional info: Academic context and definitions have been expanded for clarity and completeness.