The human nervous system Quiz
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5 questions, one answer each
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1. Which of the following structures is responsible for controlling involuntary actions such as heart rate and breathing?
- A. Cerebral cortex
- B. Medulla
- C. Cerebellum
- D. Hypothalamus
2. In a reflex arc, what is the correct order of structures involved in the response?
- A. Receptor → sensory neurone → motor neurone → relay neurone → effector
- B. Receptor → sensory neurone → relay neurone → motor neurone → effector
- C. Stimulus → relay neurone → sensory neurone → motor neurone → effector
- D. Receptor → motor neurone → relay neurone → sensory neurone → effector
3. A person with short-sightedness (myopia) has difficulty seeing distant objects clearly. Which of the following explains why and how it is corrected?
- A. Light rays focus in front of the retina; corrected using a convex lens
- B. Light rays focus behind the retina; corrected using a convex lens
- C. Light rays focus in front of the retina; corrected using a concave lens
- D. Light rays focus behind the retina; corrected using a concave lens
4. When focusing on a near object compared to a distant object, what happens to the ciliary muscles and lens?
- A. Ciliary muscles contract, suspensory ligaments tighten, lens becomes thinner
- B. Ciliary muscles relax, suspensory ligaments slacken, lens becomes thicker
- C. Ciliary muscles contract, suspensory ligaments slacken, lens becomes thicker
- D. Ciliary muscles relax, suspensory ligaments tighten, lens becomes thinner
5. Explain why synapses are important in ensuring that nerve impulses are transmitted in one direction only across the synapse, and discuss the role of neurotransmitters in this process.
- A. Neurotransmitters are only released from the postsynaptic membrane, and receptors are only on the presynaptic membrane
- B. Neurotransmitters are released from the presynaptic neurone and receptors are only on the postsynaptic membrane, ensuring one-way transmission
- C. Synapses contain myelin sheaths that prevent backward transmission of impulses
- D. The synaptic cleft is wider on one side, physically preventing impulses from travelling backwards