The heart and circulation, blood vessels, and the components and functions of blood.
The circulatory system
Humans have a double circulation: blood passes through the heart twice per circuit (to lungs, then to body). This keeps oxygenated and deoxygenated blood separate and maintains pressure.
Viewing only
This content is free to read on superexams.com and cannot be printed or downloaded.
Read the full note — free
Create a free account to read this note in full. Every free account gets 2 complete revision notes — no card needed.