Q: What is the longest nerve in the human body?
Answer: Sciatic nerve
Explanation: The sciatic nerve starts in the lower back and runs down the back of each leg. It is the largest and longest single nerve in the human body. Compression of this nerve leads to the condition known as sciatica.
Q: Which of the following is an example of a conditioned reflex?
Answer: Salivating at the smell of food
Explanation: A conditioned reflex is an acquired response that is learned through experience. It was famously studied by Ivan Pavlov using dogs and bells. Natural reflexes, like blinking, are present from birth without learning.
Q: The point of highest visual acuity in the human eye is the?
Answer: Fovea
Explanation: The fovea is a small pit in the retina where cone cells are most densely packed. It provides the sharpest vision needed for tasks like reading. It is located at the center of the macula.
Q: Which part of the brain is known as the 'little brain'?
Answer: Cerebellum
Explanation: Cerebellum is Latin for 'little brain' and it resembles a smaller version of the cerebrum. It contains more than half of the brain's neurons despite its smaller size. It is critical for motor control and some cognitive functions.
Q: Which of the following describes the electrical potential of a resting neuron?
Answer: -70 mV
Explanation: The resting potential is typically around -70 millivolts, meaning the inside is more negative. This state is maintained by the unequal distribution of ions. It allows the neuron to be ready to fire an impulse instantly.
Q: Damage to which part of the brain causes difficulty in understanding language?
Answer: Wernicke's area
Explanation: Wernicke's area is responsible for the comprehension of written and spoken language. It is located in the temporal lobe on the left side of most people's brains. Damage here leads to 'fluent aphasia' where speech sounds normal but makes no sense.
Q: Which neurotransmitter is primarily involved in the brain's reward and pleasure system?
Answer: Dopamine
Explanation: Dopamine transmits signals related to motivation, reward, and motor control. Low levels of dopamine are associated with Parkinson's disease. It plays a major role in addictive behaviors and habits.
Q: The primary auditory cortex is located in which lobe of the cerebrum?
Answer: Temporal
Explanation: The temporal lobe processes sound frequencies and pitches received from the ears. It helps in recognizing speech and identifying environmental sounds. It is also heavily involved in the formation of long-term memories.
Q: Which part of the nervous system is often called the 'gut brain'?
Answer: Enteric nervous system
Explanation: The enteric nervous system is a large network of neurons that controls the digestive tract. It can operate independently of the central nervous system. It uses many of the same neurotransmitters as the brain, like serotonin.
Q: The protective bony structure that encloses the brain is the?
Answer: Cranium
Explanation: The cranium is the part of the skull that acts as a helmet for the brain. It is composed of eight bones fused together to provide maximum strength. It protects the brain from physical trauma and injury.