The Brain Quiz: 15 Neuroscience Questions
The human brain is the most complex organ in the known universe. With its billions of neurons and endless connections, it controls our whole being. How much do you really know about this fascinating organ?
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Frequently asked questions: The Brain
A preview of what awaits you in this brain quiz: 15 multiple choice questions, each with a detailed explanation so you can learn as you play. Here are a few example questions (and their answers, so no cheating before you play!).
How many neurons does the human brain contain, approximately?
Answer: 86 billion. The human brain contains about 86 billion neurons. These nerve cells communicate with each other through electrical and chemical signals, forming a network of extraordinary complexity.
What is the name of the gap between two neurons where chemical signals are transmitted?
Answer: The synapse. The synapse is the functional contact zone between two neurons. Chemical signals (neurotransmitters) are released into the synaptic cleft to pass information from one neuron to the next.
What is the average reaction time of a reflex such as the knee-jerk reflex?
Answer: About 50 milliseconds. The knee-jerk reflex takes place in about 50 milliseconds. It is a monosynaptic reflex that does not go through the brain: the signal travels from the leg to the spinal cord and straight back, which explains its speed.
What is neuroplasticity?
Answer: The brain's ability to reorganise itself and form new connections. Neuroplasticity is the brain's remarkable ability to reorganise itself by creating new neural connections throughout life. It makes learning possible, along with adapting to new situations and recovering from certain brain injuries.
What happens in the brain during a stroke?
Answer: The blood supply to part of the brain is interrupted or a vessel bursts. A stroke occurs when a blood vessel in the brain becomes blocked (ischaemic stroke, 80% of cases) or bursts (haemorrhagic stroke). Neurons deprived of blood die quickly, causing lasting damage whose severity depends on the area affected and how quickly treatment is given.
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