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IB Biology HL D3.3.11 Hl Blood Supply Changes Questions

Use exam evidence to explain how autonomic vasoconstriction and vasodilation redistribute gut blood flow, and how exercise increases skin blood flow for heat loss.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Compare sympathetic vasoconstriction and parasympathetic vasodilation of gut blood vessels to explain redistribution of blood flow during activity.
  • Identify increased skin blood flow during exercise as a response that increases heat removal.

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Study D3.3.11 (HL)—Blood supply changes conceptsOpen the corresponding Concept lesson for explanations, examples and exam connections.

IB Biology HL D3.3.11 Hl Blood Supply Changes Questions question 1

[Maximum number: 1]

What is a reason for the changes in blood flow during exercise?

A

Increased blood flow to the kidneys removes waste products from exercise.

B

Blood flow to the brain decreases so that blood is diverted to the kidneys.

C

Increased blood flow to the skin removes heat.

D

Increased blood flow to the digestive system provides more glucose to muscles.

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