Learning objective

Indicate that lactic acid accumulates in muscles and blood during intense exercise, leading to an oxygen debt.

Read the explanation, check the common trap, then practise with flashcards and questions.

Exam focus

Cambridge IGCSE BiologyRespirationSupplement content

Study support

Understand this objective

Quick explanation

This point belongs to Anaerobic respiration, especially Anaerobic respiration outcomes.
You need to be able to indicate that lactic acid accumulates in muscles and blood during intense exercise, leading to an oxygen debt.
The key ideas to know are State.
Use the linked flashcards and practice questions to check recall, then practise applying the idea in an exam-style answer.

Key concepts

State

Why it matters

This objective helps connect Anaerobic respiration outcomes to exam-style questions, flashcards, and revision notes for Anaerobic respiration.

Revision tools

Flashcards10 linked cards

Flashcard 1 of 10

Press Space to flip, arrows to move

Practice Questions7 linked questions

Question 1 of 7

Choose an answer, get feedback, then move sideways through the set.

0 of 5 attempted

Paper 4Theory (Extended)2 marks

Description

When muscles work very hard, they produce lactic acid which accumulates in muscles and blood, causing an oxygen debt.

a
State what accumulates in muscles and blood during intense exercise.
Your answer
Aim for approximately 1 distinct marking point.
[1]
b
Identify what is meant by oxygen debt.
Your answer
Aim for approximately 1 distinct marking point.
[1]

Revision notestopic notes

Open the full topic revision notes when you are ready to review this objective in context.

Revision hubs