23. Preganglionic parasympathetic neurons releasse a) Dopamine b) Epinephrine e)
ID: 3513668 • Letter: 2
Question
23. Preganglionic parasympathetic neurons releasse a) Dopamine b) Epinephrine e) Acetylcholine dGABA 24. The cerebellum detects a) sound b) light c) body position sense d) taste 25. Damage to the corpora quadrigemina would interfere with the Ajcontrol of autonomic function. Bjregulation of body temperature. Cjconscious control of skeletal muscles. D)control of breathing. E) visual pathway 26, A 20% NaCl solution was prepared and a 13% NaCl cell was placed in the solution. What would happen to the celi? a) it would crenate b) it would lyse c) it would pump out 3 Na+ for every 2 Cl- d) it would be actively transported out of the solution. 27, A 6% solution ofpotassium was prepared, and an artificial cell that was 3% potassium was placed in it. Which was hypertonic? a) the cell b) the solution c) the potassium d) the potassium and the cell 28. A cell placed in a hypertonic solution would a) Lyse b) Crenate 29. A cell placed in a hypotonic solution would a) Lyse b) CrenateExplanation / Answer
23) This is more of a factual question, however, it may me remembered that the preganglionic fibres of both parasympathetic and sympathetic systems are cholinergic while postganglionic fibres of sympathatic system are adrenergic while those of parasympathetic system are cholinergic. THEREFORE, ANSWER MUST BE OPTION C.
24) The cerebellum cordinates movements of muscles related to posture and balance and thus is responsible for body position sense. Fun fact here is that alcohol impairs cerebellum function and the person loses track of body position therefore the distinctive gait of a person under alcohol is seen. So option is C.
25) In mid brain, four collicules are present - two superior and two inferior. These are involved in visual and auditory pathway. Therefore damage to them can disrupt visual patheay. Option E is correct.
26) Cell membrane are differentially permeable and allow only solute to move along concentration gradient. Since solute inside the cell is 13 percent and outside is 20 percent - therefore the concentration gradient for the solvent is from inside to outside. So, water moves out of the cell causing it's lysis. Option B is correct.
27) The term hypertonic implies hyper + tonic which means more solute. Therefore, whichever compartment has more solute concentration will be considered hypertonic. Here, the solution is hypertonic. Therefore, option B is correct.
28)A cell placed in hypertonicity will show exosmosis due to concentration gradient of water as explained above and therefore cell will lyse.
29) A cellplaced in hypotonic solution will crenate since wster will move in due to concentration gradient. Endosmosis will occur. Option b is correct.
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