Human Physiology
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Digestion and absorption
SubtopicDigestion and absorption under Human Physiology for Grade 12 IB.
Preview questions (no answers)
- 1.
Where does the digestion of polypeptides into amino acids primarily finish?
A.Stomach
B.Mouth
C.Small intestine
D.Esophagus
- 2.
Which enzyme is NOT secreted by the pancreas?
A.Trypsin
B.Lipase
C.Amylase
D.Pepsin
- 3.
What is the role of the microvilli on the surface of the villi?
A.To move food along the gut
B.To further increase the surface area for absorption
C.To secrete bile into the gut
D.To protect the gut from pathogens
Download the worksheet for Human Physiology - Digestion and absorption to practice offline. It includes additional chapter-level practice questions.
The blood system
SubtopicThe blood system under Human Physiology for Grade 12 IB.
Preview questions (no answers)
- 1.
What happens to the pressure in the ventricles during ventricular systole?
A.It decreases significantly
B.It remains constant
C.It increases, causing the AV valves to close
D.It increases, causing the semi-lunar valves to close
- 2.
Which of the following is true about blood in the aorta?
A.It is deoxygenated and under low pressure
B.It is oxygenated and under high pressure
C.It is deoxygenated and under high pressure
D.It is oxygenated and under low pressure
- 3.
What is the function of the Purkinje fibers?
A.To carry the electrical impulse to the ventricles
B.To produce red blood cells
C.To act as a secondary pacemaker in the atria
D.To prevent blood from flowing back into the pulmonary vein
Download the worksheet for Human Physiology - The blood system to practice offline. It includes additional chapter-level practice questions.
Defense against infectious disease
SubtopicDefense against infectious disease under Human Physiology for Grade 12 IB.
Preview questions (no answers)
- 1.
Why is the skin's acidic pH important for defense?
A.It helps the skin absorb more oxygen
B.It prevents the growth of many pathogenic bacteria
C.It speeds up the process of sweating
D.It makes the skin more flexible
- 2.
Antibiotics work by disrupting the metabolism of which type of cell?
A.Eukaryotic animal cells
B.Prokaryotic bacterial cells
C.Eukaryotic fungal cells
D.Viruses
- 3.
If a bacteria species evolves a way to pump antibiotics out of its cell, this is an example of:
A.Antibiotic resistance
B.Artificial selection
C.Viral replication
D.Phagocytosis
Download the worksheet for Human Physiology - Defense against infectious disease to practice offline. It includes additional chapter-level practice questions.
Preview questions (no answers)
- 1.
What is the relationship between the diaphragm and the abdominal muscles during forced expiration?
A.Both contract simultaneously
B.Both relax simultaneously
C.The abdominal muscles contract while the diaphragm relaxes
D.The abdominal muscles relax while the diaphragm contracts
- 2.
In which direction does the ribcage move when the external intercostal muscles contract?
A.Down and inwards
B.Up and outwards
C.Down and outwards
D.Up and inwards
- 3.
Which of these is a result of the destruction of elastin in the lung tissue of emphysema patients?
A.Lungs become more elastic
B.Alveoli can recoil more easily
C.Alveoli lose their ability to recoil during expiration
D.Gas exchange surface area increases
Download the worksheet for Human Physiology - Gas exchange to practice offline. It includes additional chapter-level practice questions.
Neurons and synapses
SubtopicNeurons and synapses under Human Physiology for Grade 12 IB.
Preview questions (no answers)
- 1.
During a resting potential, the membrane is most permeable to which ion through leakage channels?
A.B.C.D. - 2.
Which of the following is the best definition of a neurotransmitter?
A.An electrical spark that jumps between neurons
B.A chemical messenger that crosses the synaptic cleft
C.A protein that pumps ions across the membrane
D.A structural component of the myelin sheath
- 3.
Why does myelination increase the speed of a nerve impulse?
A.It allows the whole axon to depolarize at once
B.It acts as an insulator, reducing the distance the impulse must travel through ion exchange
C.It increases the number of sodium-potassium pumps
D.It makes the axon wider
Download the worksheet for Human Physiology - Neurons and synapses to practice offline. It includes additional chapter-level practice questions.
Hormones, homeostasis and reproduction
SubtopicHormones, homeostasis and reproduction under Human Physiology for Grade 12 IB.
Preview questions (no answers)
- 1.
In the male fetus, which hormone is secreted by the embryonic testes to promote the development of male internal reproductive organs?
A.Estrogen
B.Testosterone
C.FSH
D.LH
- 2.
What is the consequence of the body's cells becoming resistant to insulin?
A.Type I Diabetes
B.Type II Diabetes
C.Hyperthyroidism
D.Reduced leptin production
- 3.
When thyroxin levels are low, how does the body respond to maintain homeostasis?
A.By decreasing the basal metabolic rate
B.By increasing the production of thyroxin by the thyroid gland
C.By secreting more insulin
D.By increasing the rate of sweating
Download the worksheet for Human Physiology - Hormones, homeostasis and reproduction to practice offline. It includes additional chapter-level practice questions.