P215 Basic Human Physiology Summer 2003 Lecture Exam #2

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1 PLEASE BE AWARE CONTENT COVERED ON EXAMS VARIES FROM ONE SEMESTER TO ANOTHER. THIS EXAM MAY NOT CONTAIN MATERIAL THAT WILL BE ON YOUR EXAM THIS SEMESTER, AND/OR MAY CONTAIN MATERIAL THAT WILL NOT BE COVERED ON YOUR EXAM. P215 Basic Human Physiology Summer 2003 Lecture Exam #2 NAME I recommend that you mark answers on the exam form first, then fill out the answer sheet when you have completed the exam. Fill out your answer sheets carefully and avoid erasing answers. You will have 75 min to complete this exam. Good luck! A. Either/Or Questions (2 points each, 28 points total). Select the correct term of the two provided to make the statement true, and mark the corresponding letter (a or b) on your answer sheet. 1. Under resting conditions, there is more (a. Na + / b. K + ) inside the cell than outside the cell. 2. During the (a. absolute / b. relative) refractory period, a second action potential could be triggered if a stronger stimulus is applied. 3. The motor cortex is located in the (a. frontal / b. parietal) lobe of the cerebrum. 4. The (a. central / b. peripheral) nervous system is the integrator/controller for many of the body s physiological systems. 5. High pitched sounds stimulate hair cells maximally at the (a. base / b. apex) of the cochlea 6. There is/are (a. one / b. two) motor neuron connecting the CNS to the effector tissue in a somatic motor pathway. 7. Myelination of axons (a. increases / b. decreases) conduction velocities of action potentials. 8. Areas of the body with (a. smaller / b. larger) receptive fields have greater sensory acuity. 9. The strength of (a. action potentials / graded potentials) is proportional to the strength of the stimulus. 10. Under resting conditions, the inside of the plasma membrane is (a. positive / b. negative) relative to the outside of the cell. 11. Sensory receptors that readily undergo sensory adaptation are called (a. phasic / b. tonic) receptors. 12. An (a. EPSP / b. IPSP) is a hyperpolarization of the post-synaptic cell membrane. 13. The effects of the (a. sympathetic / b. parasymphathetic) nervous system are sometimes referred to as cholinergic effects. 14. Most of the grey matter of the brain is located on the (a. outer surface / b. interior). 1

2 B. Multiple Choice Questions: Choose the BEST answer and mark the appropriate letter on your answer sheet (3 points each, 72 points total) 15. Sensory information for the sense of typically enters the central nervous system at the spinal cord. a) vision c) touch b) equilibrium d) taste 16. deliver link the central nervous system to skeletal muscle. a) Somatic motor neurons c) Sensory neurons b) Autonomic motor neurons d) Interneurons 17. The hypothalamus is formed from which embryonic brain region? a) mesencephalon c) telencephalon b) mylencephalon d) diencephalon 18. The is a gland in the epithalamus that produces the hormone melatonin, responsible for biological clocks. a) choroid plexus c) pineal gland b) red nucleus d) pituitary gland 19. are neuroglial cells that surround the cell bodies of neurons within peripheral nervous system ganglia. a) Astrocytes c) Microglia b) Satellite cells d) Ependymal cells 20. Visual information is processed in the a) limbic system c) basal nuclei b) temporal lobe d) occipital lobe 21. During an action potential a) K + flows into the cell, then Na + flows out c) Na + flows out of the cell, then K + flows in b) Na + flows into the cell, then K + flows out d) K + flows out of the cell, then Na + flows in 22. The region of a postsynaptic cell s plasma membrane that receives neurotransmitter from the presynaptic cell is called the a) subsynaptic membrane c) synaptic cleft b) terminal bouton d) axon hillock 2

3 23. The lobe of the cerebrum is involved in memory, processing of pain sensations, and visceral responses to stress. a) frontal lobe c) insula lobe b) temporal lobe d) occipital lobe 24. The Na + /K + pump pumps these two ions in the following manner: a) Na + into the cell, K + out of the cell c) both ions into the cell b) Na + out of the cell, K + into the cell d) both ions out of the cell 25. The potential is the electrical potential at which there would be no net diffusion of an ion across the plasma membrane. a) action c) resting b) receptor d) equilibrium 26. Contraction of the muscles of the iris will cause the pupil to dilate (open) a) circular c) radial b) ciliary d) extrinsic 27. The sense of smell is perceived in the a) temporal lobe c) parietal lobe b) occipital lobe d) limbic system 28. Taste buds that provide the sensation of bitterness are most dense at the of the tongue a) back c) tip b) sides d) sides and tip 29. In the sensory process of, the response of a sensory receptor to an environmental change leads to the generation of an electrical signal in a sensory neuron. a) conduction c) tranduction b) perception d) stimulation 30. The sensation of linear movement of the head is detected by structures in the inner ear called a) otolith organs c) semicircular canals b) ampullae d) cristae 31. The hair cells of the ear are examples of. a) chemoreceptors c) thermoreceptors b) nociceptors d) mechanoreceptors 3

4 32. The is a small bone that transmits vibrations into the inner ear through the oval window. a) incus c) malleus b) stapes d) pinna 33. Action potentials are driven by the flow of ions through ion channels. a) physically-gated c) voltage-gated b) chemically-gated d) pearly-gated 34. Functions of the cerebellum include a) interpretation of language, symbols and shapes b) relaying sensory information to specific regions of the cerebral cortex c) processing sensory information and motor responses for posture and coordination d) controlling basic life functions (e.g., circulation, respiration) 35. Which of the following types of neuroglial cells insulate the axons of sensory neurons. a) Schwaan cells c) microglia b) oligodendrocytes d) ependymal cells 36. During an action potential, the flow of Na + through voltage-gated channels stops when the membrane potential reaches approximately a) -70 mv (the resting potential) c) +30 mv b) 0 mv d) +60 mv (the equilibrium potential for Na + ) 37. Action potentials usually originate at the of a neuron. a) cell body c) dendrites b) axon hillock d) axon terminals 38. The stereocilia of hair cells for the sense of hearing are embedded in the rigid of the organ of Corti. a) tectorial membrane c) otolithic membrane b) basilar membrane d) cupula 4

5 Question Answer Question Answer 1 B 20 D 2 B 21 B 3 A 22 A 4 A 23 C 5 A 24 B 6 A 25 D 7 A 26 C 8 A 27 D 9 B 28 A 10 B 29 C 11 A 30 A 12 B 31 D 13 B 32 B 14 A 33 C 15 C 34 C 16 A 35 A 17 D 36 C 18 C 37 B 19 B 38 A 5