What is a single circulatory system?

• Single system:

  • Heart pumps away deoxygenated blood
  • To gill capilleries
  • Gas exchange
  • Oxygenated blood flows to systematic capilleries
  • Gas exchange
  • Returns to heart
• Single system ✔️:

  Less complex

  No complex organs
• Single system ❌:

  Slow

  Lbp

  Low activity levels