The Body Systems You Must Know
A stand-alone review of the structure and function vocabulary required to reason through massage questions. This page is the map. Each system should be studied as anatomy + physiology + massage relevance + pathology connections.
Start with organization and homeostasis
Anatomy studies structure. Physiology studies function. Structural organization progresses from chemical → cellular → tissue → organ → organ system → organism. Homeostasis is the body's maintenance of a relatively stable internal environment through regulatory processes, often involving negative feedback.
The total chemical reactions occurring in the body. Catabolism breaks substances down; anabolism builds them.
The basic structural and functional unit of living organisms.
A group of similar cells and extracellular material performing related functions.
A structure composed of multiple tissue types working together.
Four primary tissue types
Covers surfaces, lines cavities and forms glands. Functions include protection, secretion and absorption.
Supports, binds, protects and transports. Includes fascia, tendons, ligaments, adipose, cartilage, bone and blood.
Skeletal muscle produces voluntary movement; cardiac muscle forms the heart; smooth muscle is found in hollow organs and vessels.
Neurons and supporting cells specialize in communication, sensation, integration and control.
System-by-system MBLEx map
| System | Major structures | Core functions to know |
|---|---|---|
| Integumentary | Skin, hair, nails, sweat and sebaceous glands | Protection, sensation, temperature regulation, vitamin D-related function, excretion/secretion. Know epidermis, dermis and hypodermis distinctions. |
| Skeletal | Bones, cartilage, joints, ligaments | Support, protection, leverage, mineral storage and blood-cell formation. Know axial vs appendicular skeleton and joint classifications. |
| Muscular | Skeletal muscle and associated connective tissues | Movement, posture, joint stability and heat production. Know muscle organization from muscle → fascicle → fiber → myofibril → sarcomere. |
| Nervous | Brain, spinal cord, nerves, receptors | Rapid communication, sensation, motor control and regulation. Know CNS vs PNS, somatic vs autonomic, sympathetic vs parasympathetic. |
| Endocrine | Hypothalamus, pituitary, thyroid, parathyroids, adrenals, pancreatic islets, gonads, pineal | Hormonal regulation of metabolism, growth, stress response, reproduction, fluid balance and other long-term processes. |
| Cardiovascular | Heart, blood, arteries, veins, capillaries | Transport of gases, nutrients, hormones, heat and wastes. Know chambers, valves, pulmonary vs systemic circulation and basic blood pressure concepts. |
| Lymphatic & immune | Lymph, lymphatic vessels, nodes, spleen, thymus and immune cells | Returns excess interstitial fluid, transports certain fats and supports immune defense. Lymph lacks a central pump like the heart. |
| Respiratory | Nose/nasal cavity, pharynx, larynx, trachea, bronchi, lungs/alveoli | Ventilation and gas exchange. Distinguish breathing/ventilation from cellular respiration. |
| Digestive | Mouth, pharynx, esophagus, stomach, small/large intestines plus liver, gallbladder, pancreas | Ingestion, mechanical/chemical digestion, absorption and elimination. Most nutrient absorption occurs in the small intestine. |
| Urinary | Kidneys, ureters, bladder, urethra | Filters blood, forms urine and helps regulate fluid, electrolyte and acid-base balance. |
| Reproductive | Male and female reproductive organs and associated glands | Gamete production, sex hormones, fertilization and reproduction. Pregnancy produces major cardiovascular, musculoskeletal and endocrine changes relevant to massage. |
| Sensory | Receptors and structures for touch, proprioception, vision, hearing, taste and smell | Detects internal/external stimuli and supplies information used for perception and motor control. |
Cell transport in plain language
Particles move from higher to lower concentration without direct cellular energy expenditure.
Movement of water across a selectively permeable membrane.
Passive movement down a gradient with help from membrane proteins.
Moves substances against a concentration gradient using cellular energy.
Tissue injury and repair
The MBLEx explicitly includes tissue injury and repair. Students should understand the broad progression rather than treating healing as an exact calendar.
Hemostasis and inflammatory processes begin after injury. Heat, redness, swelling and pain may be present. Aggressive local work is generally inappropriate over acutely injured tissue.
Fibroblastic activity, collagen deposition and tissue rebuilding progress. New tissue is not yet fully mature.
Collagen and tissue organization continue changing over time as tensile capacity improves.
Stage, symptoms, tissue integrity, medical restrictions and function matter more than memorizing a universal “X days after injury” rule.
How this connects to massage
MBLEx questions often require combining systems. A medication can alter cardiovascular function, which changes transfer safety. A nerve problem can alter sensation, which changes pressure. Acute tissue injury changes local technique. Pregnancy changes multiple systems at once. Don't study systems as sealed boxes.
Rapid recall
Which tissue type includes fascia, tendons and ligaments?
Connective tissue.
What is the basic functional unit of skeletal muscle contraction?
The sarcomere.
Which division is associated with “rest and digest” activity?
The parasympathetic division of the autonomic nervous system.
Where does gas exchange occur in the lungs?
Primarily across the alveolar-capillary interface.
What vessels return blood toward the heart?
Veins.
What is the major functional organ of the urinary system?
The kidneys.
What is homeostasis?
Maintenance of a relatively stable internal environment through physiological regulation.
Why is acute inflammation relevant to massage?
Local heat, swelling, pain and active tissue injury can make direct or vigorous local massage inappropriate and may require postponement, local avoidance or medical evaluation depending on the presentation.