Biology Exam — Digestive, Circulatory, Respiratory and Nervous Systems
Revise the four major systems of the human body: the digestive system (mouth to intestine), the circulatory system (heart, arteries and veins), the respiratory system (lungs and alveoli) and the nervous system (neurons, reflexes and the cerebellum). Multiple-choice questions with detailed explanation.
Biology & Geology · Primary & Secondary
The route of food: mouth → oesophagus → stomach → small intestine (absorption) → large intestine → rectum. The most tested sequence.
Arteries carry blood away from the heart under pressure (thick wall). Veins return blood to the heart (valves, thinner wall). Capillaries = gas and nutrient exchange.
CNS: brain + spinal cord. PNS: all peripheral nerves. Reflex arc: stimulus → sensory neuron → spinal cord → motor neuron → effector (no brain needed).
"A Year 8 student always confused arteries and veins. After learning "arteries leave the heart (A for Away)", she got full marks on the circulatory system section."
Tricks and techniques to master this topic faster:
The small intestine is where nutrients are absorbed — not the stomach.
The diaphragm is the main muscle for breathing in (inspiration). When it contracts, it moves down and the lungs expand.
The cerebellum controls balance and coordination; the cerebrum handles thinking and language.
If you are studying Human Body — Systems and Organs, these curriculum topics complement each other:
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