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IB Biology HL B3.2.14 Hl Single Vs Double Circulation Questions

Explore how fish route blood through one circuit, while mammals separate pulmonary and systemic circuits to maintain pressure and oxygenation in IB Biology HL B3.2.14.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare bony-fish single circulation (heart→gills→body→heart) with mammalian double circulation, in which pulmonary and systemic circuits are separated.
  • Trace a red blood cell through the right and left heart sides, pulmonary artery/veins and aorta/vena cava to show two heart pumps in mammalian circulation.
  • Explain that separate circuits keep oxygenated and deoxygenated blood apart, maintain high systemic pressure for body tissues and lower pressure through the lungs.

IB Biology HL B3.2.14 Hl Single Vs Double Circulation Questions question 1

[Maximum number: 1]

The diagrams show blood circulation in a fish and a mammal.

Figure for Question IB Biology HL B3.2.14 Hl Single Vs Double Circulation Questions question 1 — IB Biology HL
Figure for Question IB Biology HL B3.2.14 Hl Single Vs Double Circulation Questions question 1 — IB Biology HL

Which two labels represent deoxygenated blood with the lowest pressure in each animal?

A

W and Z

B

X and Y

C

W and Y

D

X and Z

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