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.
Which structural feature of the small intestine specifically increases the surface area for the absorption of nutrients?
A.Villi and microvilli
B.The length of the esophagus
C.The thickness of the serosa
D.Circular and longitudinal muscles
- 2.
What is the name of the process where waves of muscle contraction and relaxation move food along the gut?
A.Assimilation
B.Ingestion
C.Peristalsis
D.Emulsification
- 3.
The diagram below shows the sequence of organs in the human digestive tract. Which process occurs primarily in the organ labeled D?
A.Production of hydrochloric acid to kill pathogens
B.Mechanical churning of food into chyme
C.Absorption of most nutrients into the bloodstream
D.Reabsorption of water and formation of feces
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.
Which scientist is recognized for overturning the ancient theories of Galen by proving that blood circulates through the body in a closed system?
A.Charles Darwin
B.William Harvey
C.Louis Pasteur
D.Gregor Mendel
- 2.
Based on the pathway shown in the diagram, which vessel carries blood from the lungs back to the heart?
A.Pulmonary artery
B.Pulmonary vein
C.Aorta
D.Vena cava
- 3.
What is the primary direction of blood flow in the systemic circulation?
A.From the right ventricle to the lungs
B.From the lungs to the left atrium
C.From the left ventricle to the body tissues
D.From the body tissues to the left atrium
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.
Which substance is responsible for triggering an immune response when detected by the body?
A.Antigen
B.Antibody
C.Antibiotic
D.Fibrinogen
- 2.
Which statement best defines a 'pathogen'?
A.A protein produced by the body to fight infection
B.A type of medication used to treat bacterial diseases
C.An organism or virus that causes a disease
D.A harmless bacterium found in the gut flora
- 3.
What is the primary function of a phagocytic white blood cell?
A.To produce specific antibodies against a virus
B.To ingest and digest pathogens through endocytosis
C.To transport oxygen to infected tissues
D.To trigger the blood clotting cascade
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.
Why is the inner surface of the alveoli covered with a thin layer of fluid?
A.To increase the distance over which gases must diffuse
B.To prevent pathogens from entering the circulatory system
C.To provide the pressure necessary to keep the lungs inflated
D.To allow oxygen to dissolve so it can diffuse into the blood
- 2.
What is a characteristic feature of Type I pneumocytes?
A.They are cube-shaped cells that secrete pulmonary surfactant
B.They are capable of cell division to replace damaged Type II pneumocytes
C.They are extremely thin alveolar cells adapted to carry out gas exchange
D.They contain a high density of mitochondria to pump out of the blood
- 3.
Which of the following sequences correctly traces the path of an oxygen molecule during inhalation?
A.Trachea Bronchi Bronchioles Alveoli
B.Bronchi Trachea Alveoli Bronchioles
C.Trachea Alveoli Bronchioles Bronchi
D.Larynx Bronchioles Bronchi Alveoli
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 the resting potential of a neuron, what is the typical charge distribution across the plasma membrane?
A.The inside is more positive than the outside
B.The inside is more negative than the outside
C.The inside and outside have an equal charge
D.The charge depends solely on the presence of myelin
- 2.
Which ion pump is responsible for maintaining the resting potential of a neuron by moving ions against their concentration gradients?
A.Calcium pump
B.Sodium-potassium pump
C.Chloride pump
D.Proton pump
- 3.
Which of the following describes the correct direction of a nerve impulse through a single neuron?
A.Axon -> Cell Body -> Dendrite
B.Cell Body -> Dendrite -> Axon
C.Dendrite -> Cell Body -> Axon
D.Synaptic Terminal -> Axon -> Cell Body
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.
Which hormone is responsible for the development of male secondary sexual characteristics during puberty?
A.Estrogen
B.Testosterone
C.Progesterone
D.Luteinizing Hormone
- 2.
What is the primary role of Follicle Stimulating Hormone (FSH) in the female reproductive system?
A.To stimulate the development of follicles in the ovaries
B.To trigger the release of an egg during ovulation
C.To maintain the lining of the uterus after fertilization
D.To inhibit the production of estrogen
- 3.
The pineal gland is responsible for the secretion of melatonin. What is the primary function of this hormone in the human body?
A.Regulating the body's basal metabolic rate
B.Stimulating the 'fight or flight' response
C.Controlling the body's circadian rhythms
D.Regulating calcium levels in the blood
Download the worksheet for Human Physiology - Hormones, homeostasis and reproduction to practice offline. It includes additional chapter-level practice questions.