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IB Biology HL D3.3.11 Hl Blood Supply Changes Questions

Explain how exercise and epinephrine increase skeletal-muscle blood flow and reduce gut or renal flow through vasoconstriction and vasodilation; exercise can also increase skin blood flow to remove heat.

Syllabus
First assessment 2025
Course
Biology HL
Level
HL

Exam points

  • Explain how sympathetic vasoconstriction reduces gut blood flow while parasympathetic vasodilation increases it.
  • Explain why blood flow to the skin increases during exercise: increased skin perfusion helps remove heat.

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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