Chapter 1: Introduction to Anatomy & Physiology

Definitions

Understanding the basic definitions is essential for studying Anatomy & Physiology.

• Anatomy: The study of the structure and relationships between body parts.

• Physiology: The study of the function of body parts and the body as a whole.

Levels of Organization

The human body is organized into hierarchical levels, each with increasing complexity.

• Levels (from smallest to largest):

  1. Chemical (atoms and molecules)

  2. Cellular (cells)

  3. Tissue (groups of similar cells)

  4. Organ (structures composed of different tissues)

  5. Organ System (groups of organs working together)

  6. Organism (the complete living being)

• Main Body Systems: There are 11 major systems (e.g., integumentary, skeletal, muscular, nervous, endocrine, cardiovascular, lymphatic, respiratory, digestive, urinary, reproductive). Each system has specific functions vital to life.

Maintaining Life

Life functions are necessary for survival and maintaining homeostasis.

• Necessary Life Functions:

  • Maintaining boundaries

  • Movement

  • Responsiveness

  • Digestion

  • Metabolism

  • Excretion

  • Reproduction

  • Growth

Language of Anatomy

Specific anatomical terms are used to describe locations and relationships of body structures.

• Anatomical Position: The standard reference position for the body in the study of anatomy. The body stands erect, facing forward, arms at the sides with palms facing forward.

Directional Terms

Directional terms help describe the locations of structures relative to other structures or locations in the body.

• Superior/Inferior: Above/below

• Anterior/Posterior: Front/back

• Medial/Lateral: Toward the midline/away from the midline

• Proximal/Distal: Closer to/farther from the origin of a body part

• Superficial/Deep: Toward/away from the body surface

Body Planes and Body Cavities

Body planes are imaginary lines used to divide the body, and body cavities are spaces within the body that contain organs.

• Body Planes:

  • Sagittal (divides body into left and right)

  • Frontal/Coronal (divides body into anterior and posterior)

  • Transverse (divides body into superior and inferior)

• Body Cavities:

  • Dorsal cavity (cranial and vertebral cavities)

  • Ventral cavity (thoracic and abdominopelvic cavities)

Homeostasis

Homeostasis is the maintenance of a stable internal environment despite changes in external conditions.

• Definition: The body's ability to maintain relatively stable internal conditions.

• Feedback Mechanisms:

  • Negative Feedback: Reduces the effect of the original stimulus (e.g., regulation of body temperature).

  • Positive Feedback: Increases the effect of the original stimulus (e.g., blood clotting).

• Key Terms:

  • Stimulus

  • Receptor

  • Effector

  • Control Center

Chapter 2: Basic Chemistry

Energy and Matter

Understanding the basic principles of chemistry is essential for studying physiological processes.

• Energy: The capacity to do work. Exists in various forms (chemical, electrical, mechanical, radiant).

• Matter: Anything that occupies space and has mass.

Composition of Matter

Matter is composed of elements, which are made up of atoms.

• Elements: Pure substances that cannot be broken down by ordinary chemical means.

• Atoms: The smallest unit of an element that retains its properties.

• Subatomic Particles:

  • Protons: Positively charged particles found in the nucleus.

  • Neutrons: Neutral particles found in the nucleus.

  • Electrons: Negatively charged particles orbiting the nucleus.

Atomic Structure and Identification

Atoms are identified by their atomic number, atomic mass, and element symbol.

• Atomic Number (): Number of protons in the nucleus.

• Atomic Mass (): Sum of protons and neutrons in the nucleus.

• Element Symbol: One or two-letter abbreviation for an element (e.g., H for hydrogen).

Bohr Model and Electron Placement

The Bohr model is a simplified representation of atomic structure, showing electrons in energy levels around the nucleus.

• Drawing the Bohr Model: Place electrons in shells around the nucleus according to energy levels.

• Electron Configuration: The arrangement of electrons in an atom's shells.

Ion Formation

Atoms can gain or lose electrons to become charged particles called ions.

• Cation: An atom that loses electrons and becomes positively charged.

• Anion: An atom that gains electrons and becomes negatively charged.

Example: Sodium (Na) loses one electron to become Na+; Chlorine (Cl) gains one electron to become Cl-.

Key Equations

• Atomic Number:

• Atomic Mass:

• Charge of Ion:

*Additional info: The notes have been expanded to include standard definitions, examples, and context for each topic to ensure completeness and academic quality.*