ProblemSet5

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University of Pennsylvania *

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109

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Biology

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Feb 20, 2024

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Weekly Problem Set # 5 ANSWER KEY 1. Label the temporal, parietal, occipital, and frontal lobes; label the primary motor, somatosensory, auditory, and visual cortices; label the cerebellum, pons, and medulla 2. A severe stroke near the left primary motor cortex could cause _______ loss of motor function; a lesion of the right descending corticospinal tract in the midbrain could cause _______ loss of motor function. a. contralateral; contralateral b. contralateral; ipsilateral c. ipsilateral; contralateral d. ipsilateral; ipsilateral 3. Which of the following brain structures are NOT properly matched with the secondary vesicles from which they derive? Select all that apply. a. Basal ganglia – Telencephalon b. Hypothalamus - Telencephalon c. Cerebellum – Myelencephalon d. Pons – Metencephalon 4. An infant presents with severe body temperature dysregulation and excessive urination, which indicates that their body cannot properly balance levels of salt and water. These symptoms could have arisen from improper development of which secondary brain vesicle? a. Telencephalon b. Diencephalon c. Mesencephalon d. Metencephalon 5. Which of the following components of the ventricular system are correctly matched with the brain regions they are specific to? Select all that apply. a. Fourth ventricle – Hindbrain b. Cerebral aqueduct – Midbrain c. Third ventricle – Myelencephalon
d. Lateral ventricle – Telencephalon 6. Select the order of differentiation below that could give rise to an excitatory neuron in the cerebral cortex: a. Neural tube cell Neural crest cell Forebrain cell Diencephalic cell b. Neural plate cell Neural crest cell Midbrain cell Mesencephalic cell c. Neural plate cell Neural tube cell Forebrain cell Telencephalic cell d. Neural tube cell Neural plate cell Forebrain cell Telencephalic cell 7. A patient visits their ophthalmologist for a routine check-up. The doctor finds that the patient has high eye pressure. Name the structure of the eye the doctor suspects is not functioning properly, it’s main function, and a disease that this patient could be developing. The affected structure is likely the aqueous humor, which nourishes the cornea. This patient could be developing glaucoma, which is associated with elevated intra ocular pressure. 8. Would each of the following manipulations below increase, decrease, or have no effect on the membrane depolarization of an ORN upon binding to an odorant? (circle one per line) a. Block chloride channels Increase Decrease No Effect b. Increase extracellular Ca2+ Increase Decrease No Effect c. Ablate (destroy) its glomerulus Increase Decrease No Effect d. Increase cAMP in ORN Increase Decrease No Effect
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