Instructions to Students
- This quiz contains 20 multiple-choice questions on the introductory concepts of the nervous system and the endocrine system.
- All questions are restricted to the first three levels of Bloom's taxonomy: Remember (recall facts), Understand (explain concepts), and Apply (use knowledge in simple scenarios).
- Attempt all questions before checking the answers.
- Each question has exactly one correct answer. The correct answer and a short explanation are provided below each question — click "Reveal Answer" after attempting.
- Time recommended: 40 minutes. Total marks: 20 (1 mark per question).
- Record your score in the Score section at the bottom of the page.
Bloom's Taxonomy Coverage Map
Every question is tagged with its Bloom's level so you know the cognitive demand being tested:
Part A — Remember (Questions 1–7)
Q1. Which cells are the basic structural and functional units of the nervous system?
Remember✔ Correct Answer: A — Neurons
Explanation: Neurons are the fundamental signalling cells of the nervous system. They receive, process, and transmit information as electrical and chemical signals. Osteocytes (bone), adipocytes (fat) and erythrocytes (red blood cells) belong to other tissues.
Q2. Which glial cells produce the myelin sheath around axons in the central nervous system (CNS)?
Remember✔ Correct Answer: B — Oligodendrocytes
Explanation: Oligodendrocytes myelinate multiple axons within the CNS, whereas Schwann cells myelinate axons in the peripheral nervous system (PNS). Astrocytes support the blood–brain barrier, and microglia act as immune cells of the CNS.
Q3. What is the name of the junction between a neuron and its target cell (another neuron, muscle, or gland)?
Remember✔ Correct Answer: A — Synapse
Explanation: A synapse is the specialised junction where a neuron communicates with another cell. The Node of Ranvier is a gap in the myelin sheath, the axon hillock is the site of action potential initiation, and the sarcolemma is the muscle cell membrane.
Q4. Which part of the brain is primarily responsible for regulating the endocrine system via hormone-releasing factors?
Remember✔ Correct Answer: B — Hypothalamus
Explanation: The hypothalamus controls the pituitary gland by secreting releasing and inhibiting hormones, linking the nervous system to the endocrine system. The cerebellum coordinates movement, the medulla controls autonomic functions, and the pons relays signals.
Q5. Which gland is known as the "master gland" of the endocrine system?
Remember✔ Correct Answer: C — Pituitary gland
Explanation: The pituitary gland is called the master gland because its hormones regulate the activity of many other endocrine glands, including the thyroid, adrenals, and gonads.
Q6. Which hormone is produced by the beta cells of the islets of Langerhans in the pancreas?
Remember✔ Correct Answer: B — Insulin
Explanation: Beta cells of the pancreatic islets secrete insulin, which lowers blood glucose. Glucagon is secreted by alpha cells, cortisol by the adrenal cortex, and thyroxine by the thyroid gland.
Q7. What is the primary chemical messenger released at the neuromuscular junction to trigger muscle contraction?
Remember✔ Correct Answer: C — Acetylcholine
Explanation: Acetylcholine (ACh) is the neurotransmitter released by motor neurons at the neuromuscular junction; it binds receptors on the muscle fibre membrane and initiates contraction.
Part B — Understand (Questions 8–14)
Q8. Why does myelination increase the conduction speed of a nerve impulse?
Understand✔ Correct Answer: B — Saltatory conduction between Nodes of Ranvier
Explanation: The myelin sheath insulates the axon so that action potentials are regenerated only at the exposed Nodes of Ranvier; the impulse therefore "jumps" (saltates) from node to node, greatly increasing conduction velocity compared with continuous conduction in unmyelinated axons.
Q9. How does the endocrine system differ from the nervous system in the way it communicates with target organs?
Understand✔ Correct Answer: B — Hormones released into the bloodstream
Explanation: The endocrine system communicates chemically via hormones secreted into the blood, producing slower-onset but longer-lasting, widespread effects. The nervous system uses fast, targeted electrical impulses and neurotransmitters across synapses.
Q10. A patient has a lesion destroying the myelin in the spinal cord but leaving the axons intact. Which statement best explains why nerve conduction is impaired?
Understand✔ Correct Answer: B — Current leaks out of the axon
Explanation: Myelin acts as electrical insulation. When it is destroyed (as in demyelinating diseases such as multiple sclerosis), local current leaks across the membrane, so the impulse decays before reaching the next node and conduction slows or fails — even though the axon itself is intact.
Q11. Why does a hormone like insulin only act on certain cells in the body?
Understand✔ Correct Answer: B — Target cells have specific receptors
Explanation: Hormone specificity comes from receptor proteins on or inside target cells. Only cells bearing insulin receptors can respond to insulin; cells without the receptor cannot detect the hormone regardless of its concentration.
Q12. Which statement best describes negative feedback in the endocrine system?
Understand✔ Correct Answer: B — Output inhibits further production
Explanation: Negative feedback keeps hormone levels within a set range: when a hormone's concentration (or the variable it controls, e.g., blood glucose) rises sufficiently, it suppresses the gland's further secretion. This is the dominant control mechanism of the endocrine system.
Q13. An electroencephalogram (EEG) records rhythmic electrical activity from the scalp. What is the source of this recorded signal?
Understand✔ Correct Answer: B — Summed postsynaptic potentials of cortical neurons
Explanation: EEG electrodes detect the summed excitatory and inhibitory postsynaptic potentials of synchronised populations of pyramidal neurons in the cerebral cortex. Individual action potentials are too brief and localised to be recorded from the scalp.
Q14. Why can a single neuron integrate signals from thousands of other neurons?
Understand✔ Correct Answer: A — Dendrites and cell body sum many inputs
Explanation: A neuron's dendrites and soma receive thousands of synaptic contacts. Excitatory postsynaptic potentials (EPSPs) and inhibitory postsynaptic potentials (IPSPs) summate (spatially and temporally) at the axon hillock; if threshold is reached, an action potential is fired — this is neural integration.
Part C — Apply (Questions 15–20)
Q15. A diabetic patient's blood glucose rises to 14 mmol/L after a meal. Applying your knowledge of pancreatic endocrine function, which response should occur in a healthy person?
Apply✔ Correct Answer: B — Beta cells release insulin
Explanation: High blood glucose stimulates pancreatic beta cells to secrete insulin. Insulin promotes glucose uptake by muscle and adipose tissue and storage as glycogen, reducing blood glucose toward normal — the core defect in diabetes mellitus is absence or resistance to this action.
Q16. A biomedical engineer is designing a nerve conduction velocity (NCV) test. Two electrodes stimulate a nerve at the wrist and elbow, 25 cm apart, and the impulse arrives 5 ms later at the elbow recording site. What is the conduction velocity?
Apply✔ Correct Answer: C — 50 m/s
Explanation: Conduction velocity = distance ÷ time. Distance = 25 cm = 0.25 m; time = 5 ms = 0.005 s. Velocity = 0.25 / 0.005 = 50 m/s. This is a typical value for a healthy myelinated peripheral motor nerve; slower values suggest demyelination or axonal damage — exactly what NCV testing is used to detect.
Q17. A patient with hyperthyroidism has elevated T3/T4 levels. Applying negative feedback principles to the hypothalamus–pituitary–thyroid axis, what would you expect?
Apply✔ Correct Answer: B — Decreased TRH and TSH
Explanation: Elevated thyroid hormones (T3/T4) exert negative feedback on the hypothalamus and anterior pituitary, suppressing TRH and TSH release. This attempts to reduce further thyroid stimulation — a clinical laboratory pattern commonly used to localise the cause of hyperthyroidism.
Q18. During a laboratory experiment on frog sciatic nerve, you apply a drug that blocks voltage-gated Na⁺ channels. Applying your knowledge of the action potential, what will happen?
Apply✔ Correct Answer: A — Resting potential hyperpolarises / action potentials blocked
Explanation: Voltage-gated Na⁺ channels are essential for the depolarising phase of the action potential. Blocking them prevents Na⁺ influx, so the upstroke cannot occur and impulse conduction stops. Local anaesthetics (e.g., lidocaine) work by exactly this mechanism.
Q19. A patient with a pituitary tumour secretes excess growth hormone (GH) in adulthood. Applying endocrine knowledge, which condition will develop?
Apply✔ Correct Answer: B — Acromegaly
Explanation: Excess GH in childhood causes gigantism (growth plates still open), whereas excess GH after epiphyseal closure causes acromegaly — enlargement of hands, feet, jaw and soft tissues. Dwarfism results from GH deficiency in childhood; cretinism from congenital hypothyroidism.
Q20. In designing a neural implant to restore movement after spinal cord injury, an engineer must pick the interface location. Applying your knowledge of motor pathways, where should the implant be placed to record signals that best represent intended voluntary movement?
Apply✔ Correct Answer: B — Motor cortex
Explanation: Voluntary movement originates as motor commands in the primary motor cortex; these signals descend through the corticospinal tract. If the spinal cord below the injury is intact but disconnected, an implant in the motor cortex (e.g., a brain–computer interface) can record intended-movement signals and drive external devices or stimulators.
Quick Answer Key (Post-Test Reference)
| Q | Ans | Bloom Level | Q | Ans | Bloom Level |
|---|---|---|---|---|---|
| 1 | A | Remember | 11 | B | Understand |
| 2 | B | Remember | 12 | B | Understand |
| 3 | A | Remember | 13 | B | Understand |
| 4 | B | Remember | 14 | A | Understand |
| 5 | C | Remember | 15 | B | Apply |
| 6 | B | Remember | 16 | C | Apply |
| 7 | C | Remember | 17 | B | Apply |
| 8 | B | Understand | 18 | A | Apply |
| 9 | B | Understand | 19 | B | Apply |
| 10 | B | Understand | 20 | B | Apply |
Record Your Score
Enter the number of correct answers (0–20) and click Grade.