Neurobiology — DU B.Sc. (Hons.) Zoology Previous Year Question Papers

1. (A) Define the following terms: 4x1=4 Ion channel (iii) Cerebrospinal fluid (iv) Sleep apnea (B) Expand the following terms: 5x1=5 (C) Differentiate between the following: 3x2=6 (i) Central Nervous System and Peripheral Nervous System 2. 3. 4. 5. (iii) Electrical synapse and Chemical synapse (a) What is a synapse? Explain briefly how neurons communicate across a synapse during the transmission of nerve impulses. (5) (b) Discuss the pathological hallmarks of Alcheimer's disease, foousing on the role of plaques and tangles in neuronal degeneration. (10) (a) What is cerebrospinal fluid? Briefly explain its composition and functions. (5) (b) Describe the stages of sleep and the BEG patterns associated with each stage. How does sleep architecture change throughout the night?. (10) Explain how changes in membrane permeability contribute to the generation of an action pot.ential. ( 15) Write short notes on the following (4#jJ fferee): 5 x 3 = 15 (ii) Gaseous iveurotransmitters (iii) Structure of a neuron (iv) Circadian rhythm