Please answer the following questions for numbers 5,6 and 7. If you are not sure
ID: 199628 • Letter: P
Question
Please answer the following questions for numbers 5,6 and 7. If you are not sure please write it next to the problem number. I am a little confused on these, I will rate good!
5. Counter current blood flow arrangements, evident in the juxtaposed vein-artery positions in t creatures such as sea birds and the flukes of certain dolphins, have what adaptive purpose? a. adequate exchange of oxygern b. adequate exchange of carbon dioxide c. warming of the blood before it returns to the inner core of the animal d. cooling of the blood during bouts of intense exercise 6. In understanding the northern shift in the distribution of North Sea teleost fish species, which of the following aspects of teleost physiology is most relevant? a. they have mesonephritic kidneys b. they are hypo osmotic to their environment c. they have countercurrent gas exchange across their gills d. they are poikilotherms KEY Summer (b) Insulatory acclimatization in a red fox 5 2.0 Winter 1.5 1.0 -50 -40 -30 -20 -10 0 10 20 30 Ambient temperature (°C) 7. What is the significance of the difference between the summer and winter curves (the summer curve is the upper curve) in the figure above? a. By increasing its insulation, the fox lowers its basal metabolic rate in the thermal neutral zone. b. By increasing its insulation, the fox increases its basal metabolic rate. c. By increasing its insulation, the fox extends its thermal neutral zone to much lower ambient temperatures By increasing its rate of oxygen consumption, the fox can cope with lower temperatures by shivering. d.Explanation / Answer
5. Counter Current serves the purpose of warming the blood before it returns to the inner core of the animal. Countercurrent is an adaptation to conserve thermal energy. Hence option c, warming of the blood before it returns to the inner core of the animal is the correct option.
6. Teleost cannot control their body temperature and hence can survive only in a narrow range of temperature. Thus their nothern shift can be regarded due to teleost's being pokiotherms. Hence option d.
7. According to my interpretation of the graph By increasing insulation, the fox extends the range of its thermal neutral zone to much lower ambient temperature ranges. Thus option c seems correct.