Foundations of Anatomy & Physiology: Structure, Function, and Organization of the Human Body

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Anatomy and Physiology: Definitions and Branches

Introduction to Anatomy and Physiology

Anatomy is the science of body structures and their relationships, while physiology is the science of body functions. Together, these disciplines provide a comprehensive understanding of how the human body is organized and operates.

Anatomy: Study of body structures and their relationships.
Physiology: Study of body functions.
Dissection: The careful cutting apart of body structures to study their relationships.

Branches of Anatomy

Developmental Biology: Study of growth and development of an individual.
Embryology: Study of the first eight weeks of growth and development after fertilization of a human egg.
Cell Biology: Study of cellular structure and functions.
Histology: Study of microscopic structure of tissues.
Gross Anatomy: Study of structures that can be examined without a microscope.
Systemic Anatomy: Study of specific systems of the body (e.g., nervous or respiratory system).
Regional Anatomy: Study of specific regions of the body (e.g., head, chest).
Surface Anatomy: Study of surface markings of the body to understand internal anatomy through visualization and palpation.
Imaging Anatomy: Study of internal body structures visualized with techniques such as x-rays, MRI, CT scans.
Clinical Anatomy: Application of anatomy to medicine, dentistry, and other health-related sciences.
Pathological Anatomy: Study of structural changes (gross to microscopic) associated with disease.

Branches of Physiology

Molecular Physiology: Functions of individual molecules such as proteins and DNA.
Neurophysiology: Functional properties of nerve cells.
Endocrinology: Study of hormones and how they control body functions.
Cardiovascular Physiology: Functions of the heart and blood vessels.
Immunology: Body's defenses against disease-causing agents.
Respiratory Physiology: Functions of air passageways and lungs.
Renal Physiology: Functions of the kidneys.
Exercise Physiology: Changes in cell and organ function due to muscular activity.
Pathophysiology: Functional changes associated with disease and aging.

Levels of Structural Organization

The Body's Six Levels of Organization

The human body is organized into six structural levels, each building upon the previous one to form a complete organism.

Chemical Level: Atoms and molecules essential for life (e.g., C, H, O, N, P, Ca, S).
Cellular Level: Molecules combine to form cells, the basic structural and functional units of an organism.
Tissue Level: Groups of cells and materials surrounding them that work together to perform a particular function. Four basic types: epithelial, connective, muscular, and nervous tissue.
Organ Level: Different types of tissues joined together to form organs (e.g., stomach, skin, bones, heart, liver).
System Level: Related organs with a common function (e.g., digestive system, nervous system).
Organismal Level: All parts of the human body functioning together constitute the total organism.

Overview of the Eleven Organ Systems

Table: The Eleven Systems of the Human Body

System	Components	Functions
Integumentary	Skin, hair, nails, sweat and oil glands	Protects body, regulates temperature, eliminates waste, detects sensations, synthesizes vitamin D
Skeletal	Bones, joints, cartilages	Supports and protects body, provides surface for muscle attachment, aids movement, stores minerals and lipids, houses blood cell production
Muscular	Skeletal muscle tissue	Participates in body movements, maintains posture, produces heat
Nervous	Brain, spinal cord, nerves, special sense organs	Generates action potentials, regulates body activities, interprets changes, responds via muscular contractions or glandular secretions
Endocrine	Hormone-producing glands (e.g., pituitary, thyroid, adrenal, pancreas, ovaries, testes)	Regulates body activities by releasing hormones
Cardiovascular	Blood, heart, blood vessels	Pumps blood, carries oxygen and nutrients, regulates acid-base balance, temperature, water content, defends against disease, repairs blood vessels
Lymphatic/Immune	Lymphatic fluid, vessels, spleen, thymus, lymph nodes, tonsils, immune cells	Returns proteins and fluid to blood, carries lipids, contains immune responses
Respiratory	Lungs, air passageways (pharynx, larynx, trachea, bronchi)	Transfers oxygen and carbon dioxide, regulates acid-base balance, produces sounds
Digestive	Mouth, pharynx, esophagus, stomach, intestines, anus, accessory organs (salivary glands, liver, gallbladder, pancreas)	Breaks down food, absorbs nutrients, eliminates waste
Urinary	Kidneys, ureters, urinary bladder, urethra	Produces, stores, eliminates urine; regulates blood volume and composition
Reproductive	Gonads (testes, ovaries), associated organs (uterine tubes, uterus, vagina, epididymis, ductus deferens, seminal vesicles, prostate, penis, mammary glands)	Produces gametes, releases hormones, supports reproduction

Basic Life Processes

Six Essential Life Processes

Metabolism: Sum of all chemical processes in the body, including catabolism (breakdown) and anabolism (building up).
Responsiveness: Body's ability to detect and respond to changes in the internal or external environment.
Movement: Includes motion of the whole body, organs, cells, and organelles.
Growth: Increase in body size due to an increase in cell number, size, or material between cells.
Differentiation: Development of a cell from an unspecialized to a specialized state.
Reproduction: Formation of new cells for growth, repair, or replacement; production of a new individual.

Clinical Application: Autopsy

Definition and Importance

Autopsy: Post-mortem examination of the body and dissection of internal organs to determine the cause of death.
Helps confirm or discover the existence of diseases, determine the extent of injuries, and provide information for disease study and education.
May be legally required in certain cases (e.g., suspicious deaths, congenital defects).

Additional info:

Some explanations and examples have been expanded for clarity and completeness.
Table 1.2 and system functions have been logically grouped and formatted for study purposes.