PYC1501 May/Jun 2018 exam paper — questions

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  1. Question 1 · The human nervous system · 1 marks

    Each question is a multiple-choice item worth one mark, and Questions 8 to 10 refer to a shared newspaper scenario about Mrs Smith, who sustained head injuries in an accident: before the accident she was an excellent swimmer, but afterwards she could no longer perform basic swimming movements, could not feel the temperature of the water while trying to swim, and struggled both to understand what was said to her and to use language effectively. During a class presentation, a student claims that neurons can send impulses continuously. Which of the following best evaluates this statement: is it (1) correct, because neurons are never inactive; (2) incorrect, because the resting potential must be restored before another impulse can fire; (3) incorrect, because impulses cannot be conducted during the absolute refractory period; or (4) correct, because the refractory period prevents over-stimulation of the nervous system?Show the full question

  2. Question 2 · The human nervous system · 1 marks

    Each question is a multiple-choice item worth one mark, and Questions 8 to 10 refer to a shared newspaper scenario about Mrs Smith, who sustained head injuries in an accident: before the accident she was an excellent swimmer, but afterwards she could no longer perform basic swimming movements, could not feel the temperature of the water while trying to swim, and struggled both to understand what was said to her and to use language effectively. Identify which one of the following statements about neurons is INCORRECT: (1) neurons are part of a communication network that influences how the body functions; (2) the nucleus is a control centre because it controls all metabolic activities in a cell; (3) motor or efferent neurons carry messages from the environment to the spinal cord and the brain; (4) impulse conduction in a neuron is mainly made up of electrical and chemical processes.Show the full question

  3. Question 3 · The human nervous system · 1 marks

    Each question is a multiple-choice item worth one mark, and Questions 8 to 10 refer to a shared newspaper scenario about Mrs Smith, who sustained head injuries in an accident: before the accident she was an excellent swimmer, but afterwards she could no longer perform basic swimming movements, could not feel the temperature of the water while trying to swim, and struggled both to understand what was said to her and to use language effectively. While walking to school, Khensani was startled by very loud explosions coming from a nearby factory. Taking into account the characteristics of impulse conduction, select which one of the following statements correctly applies to this scenario: (1) the frequency of impulse conduction increased because of the loud explosion; (2) the magnitude of impulse conduction increased because of the loud explosion; (3) compared with softer sounds, a loud explosion causes impulse conduction to become faster; or (4) the loud explosion is a more intense stimulus and causes larger changes in the membrane potential.Show the full question

  4. Question 4 · The human nervous system · 1 marks

    Each question is a multiple-choice item worth one mark, and Questions 8 to 10 refer to a shared newspaper scenario about Mrs Smith, who sustained head injuries in an accident: before the accident she was an excellent swimmer, but afterwards she could no longer perform basic swimming movements, could not feel the temperature of the water while trying to swim, and struggled both to understand what was said to her and to use language effectively. What term describes the gaps that separate the myelin sheaths along a neuron: (1) axon hillocks, (2) nodes of Ranvier, (3) boutons, or (4) dendrites?Show the full question

  5. Question 5 · The human nervous system · 1 marks

    Each question is a multiple-choice item worth one mark, and Questions 8 to 10 refer to a shared newspaper scenario about Mrs Smith, who sustained head injuries in an accident: before the accident she was an excellent swimmer, but afterwards she could no longer perform basic swimming movements, could not feel the temperature of the water while trying to swim, and struggled both to understand what was said to her and to use language effectively. Complete the following statement about impulse conduction: in a myelinated axon, impulse conduction is known as ___ conduction, whereas in an un-myelinated axon it is known as ___ conduction. Choose the pair that correctly fills both blanks: (1) resting membrane - generator potential; (2) postsynaptic potential - salutatory; (3) axon hillock - refractory period; (4) salutatory - action potential.Show the full question

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