HUMAN BODY SYSTEMS
Human body systems
Begin with the position and structure of organs, explore how they work, then connect the systems.
LESSON 09
Overview of body structure
Describe organ locations using the person’s own left and right and common anatomical directions.
Read lesson ↗LESSON 10
Heart
Explain blood flow and valve position using pressure differences.
Read lesson ↗LESSON 11
Vessels and circulation
Distinguish pressure, flow and perfusion.
Read lesson ↗LESSON 12
Blood
Distinguish plasma, red cells, white cells and platelets.
Read lesson ↗LESSON 13
Respiratory system
Explain how pressure changes drive ventilation.
Read lesson ↗LESSON 14
Digestive system
Distinguish digestion, absorption and defecation.
Read lesson ↗LESSON 15
Liver
Connect portal circulation with hepatocyte functions.
Read lesson ↗LESSON 16
Urinary system
Trace substances through filtration, reabsorption and secretion.
Read lesson ↗LESSON 17
Nervous system
Distinguish central, peripheral, afferent and efferent pathways.
Read lesson ↗LESSON 18
Endocrine system
Compare hormone classes and cellular responses.
Read lesson ↗LESSON 19
Immune and lymphatic systems
Connect lymphatic return with immune organisation.
Read lesson ↗LESSON 20
Bones, joints and muscles
Connect bone and joint structure to support and motion.
Read lesson ↗LESSON 21
Skin
Explain protection and nourishment using skin layers.
Read lesson ↗LESSON 57
Reproductive system
Connect reproductive structures and functions.
Read lesson ↗