10. Please provide correct solution. Preferentially done by hand or on paper. 35
ID: 50530 • Letter: 1
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10. Please provide correct solution. Preferentially done by hand or on paper. 35. In response to increased osmotic pressure of blood, the posterior pituitary releases ADH into the blood In response to this hormone,- _ are inserted into walls of the pituitary releases ADH into the blood. In a. Na K ATPase; distal convoluted tubule. b. Aquaporins; proximal convoluted tubule c. Osmoreceptors; glomerulus. d. Aquaporins; collecting ducts e. Juxtamedullary nephrons; medulla. 36. Where is most of the water reabsorbed in the nephron of a human kidney? a. Proximal convoluted tubule. b. Descending loop of loop of Henle. c. Thin portion of ascending loop of loop of Henle d. Thick portion of ascending loop of loop of Henle. e. Collecting duct. 37. A postsynaptic neuron generates an EPSP in response to the flow of a. K ions out of the cell. b. Na ions into the cell. c. Cl into the cell. d. All of the above. 38. Which ions enter into the terminal part of an axon via a voltage gated channel (in response to an action potential), and cause synaptic vesicles to release neurotransmitters? a. Cl c. Na d. Ca e. All of the above. 39. Which type of sensory receptor can amplify a stimulus to improve the sensitivity of detection? a. lonotropic. b. Metabotropic. c. Neither d. Both. 40. The contraction strength of a particular muscle can be regulated/varied by a. Varying the number of motor units activated b. Varying the rate of action potential frequency stimulation. c. Varying the rate of ATP production. d. Both a. & b. e. Both b. &c; Which type of photoreceptor is most sensitive to dim light, and where is this receptor type most concentrated in the retinal layer? 41. a. Rods; away from the fovea. b. Rod; in the fovea. c. Cones; away from the fovea. d. Cones; in the fovea. e. Both rods & cones are equally receptive to dim light; they are both concentrated in the fovea.Explanation / Answer
1. E. Blood plasma and cytoplasm are fairly similar in the oncotic pressure since cells will either burst or shrink if the solution is not isotonic. The ion composition of the blood plasma and cytoplasm are also similar. The ions present are sodium, potassium, chloride and calcium.
2. D. Babies do not shiver but produce heat by non shivering thermogenesis in brown fat tissue. Vasoconstriction occurs when exposure to cold occurs.
3. C. Training at high altitudes increases the number of RBC in the blood. This helps them to compete better at sea level since more oxygen by the large number of RBC.
4. E. Columnar cells are present in the intestine whcih help in the secretion of some proteins while squamous cells are present in the endothelial cells of the capillaries.
5. A. The vessels with warm blood are present next to the vessels with cold blood. This helps the heat to transfer to the cold blood. The currents are in the opposite direction. Hence it is called countercurrent.
6. B. AS the size of the animal increases, the surface area to volume decreases. This reduces the evaporation and also the metabolic rate of the animal.
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