Practice Human physiology with authentic IB Biology exam questions for both SL and HL students. This question bank mirrors Paper 1A, 1B, 2 structure, covering key topics like cell biology, genetics, and ecology. Get instant solutions, detailed explanations, and build exam confidence with questions in the style of IB examiners.
Paper
Level
Question 1
SLPaper 1A
If the heart of a vertebrate is removed and placed in a solution of nutrients, it will continue to beat for many hours. Related to this, which of the following is true?
Question 2
SLPaper 2
The graph below shows the levels of hormones during the menstrual cycle.
1.[2]
Identify hormones I and II.
2.[2]
Outline the roles of FSH in the menstrual cycle.
3.[1]
FSH is secreted by the pituitary gland. During pregnancy, FSH secretion is inhibited. Suggest how FSH secretion could be inhibited during pregnancy.
Question 3
SLPaper 2
1.[6]
Draw a labelled diagram of the human heart showing the attached blood vessels.
2.[5]
Describe the action of the heart in pumping blood.
3.[7]
Nerves connecting the brain and heart contain neurons that control heart rate. Explain how a nerve message passes from one neuron to another neuron.
Question 4
HLPaper 1A
The graph shows the amounts of two substances present in food ingested by a healthy person as it moves along the gut.
Which substances could X and Y be?
Question 5
SLPaper 2
The structure of part of the digestive system is shown in the diagram below. 
[Source: https://wccyusoueahdpdicsyrg.supabase.co/storage/v1/object/public/question-images/images/69c87bb4-31dd-4a17-a292-cd2edda2d48f.jpg Created by Wikipedia user: Madhero88.]
1.[1]
Label the diagram to show the structure that is involved in digestion of proteins in acid conditions (using the letter A).
2.[1]
Label the diagram to show the structure where most absorption of water to prevent dehydration occurs (using the letter B).
3.[1]
Label the diagram to show the structure where most absorption of nutrients occurs (using the letter C).
4.[2]
Explain how the structure of veins is adapted to their function.
5.[2]
Cells defend the body against pathogens. Outline how some of these cells ingest pathogens in the blood and in body tissues.
Question 6
HLPaper 1A
The body has different defenses against infectious disease. Which cells provide non-specific immunity?
Question 7
SLPaper 1A
How do phagocytic leucocytes help to protect against disease?