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- Homeostasis is a natural phenomenon which is body’s tendency to maintain internal stable and favorable environment against any situation that would tend to disturb its normal condition and function. Such as, If the temperature rises, the body loses heat by sweating or panting, via the latent heat of evaporation. If it falls, this is counteracted by increased metabolic action, by shivering and in fur or feather coated animals, by thickening the coat. Like temperature our body can sense the change in osmolarity and to maintain a stable condition body needs to persist on a certain osmolarity. Secretion of certain hormones can be stimulated by any change in the osmolarity to help maintain a certain level of osmolarity - briefly discuss the mechanism of action and biochemical function of such a hormone.Body temperature is homeostatically regulated around a set point. Given your knowledge of negative feedback and homeostatic control systems, predict whether narrowing or widening of the blood vessels of the skin will occur when a person exercises strenuously. (Hints: Muscle contraction generates heat. Narrowing of the vessels supplying an organ decreases blood flow through the organ, whereas vessel widening increases blood flow through the organ. The more warm blood flowing through the skin, the greater is the lossImagine you are sick and you have fever. Sensors on the skin and brain detect this and communicate with the temperature regulatory center in the brain which then sends out a command to the sweat glands of your body as a result of which you start sweating and in about 15 mins your body temperature comes back to normal for the time being. This this feedback loop, identify the following: sensors control center effector stimulus response
- Although hibernators drop their body temperatures, they do manage maintain a body temperature close to or slightly above ambient temperatures in their burrows. They generate or conserve heat in all of the following ways except one. Which is the one? Non shivering thermogenesis Ruffling the pelage Eating more Calories Bouts of intense shiveringIt is a warm day and you feel a little chilly. On checking your temperature, you find that your body temperature is 1.5 degrees below normal. Suggest 3 possible reasons for this situation. Describe briefly how your body will react to this dip in temperature.Which of the following is the best explanation of the relationship shown in the graphs below? Glycogen Levels in Calf Muscle during Treadmill Running Reported Effort during extreme Treadmill Running normal 75%- heavy 50%- moderate 25%- light- 0 3 0 1 2 2 time (hours) time (hours) At extreme levels of effort, glycogen levels are normal At light levels of effort, glycogen levels are at 25% At light levels of effort, glycogen levels are at normal At extreme levels of effort, glycogen levels are at 75% muscle glycogen level O effort level
- In the negative feedback system for regulation of body temperature. Identify the following. 1. Stimulus 2. Receptor 3. Control Center 4. Effector 5. ResponseIf daytime body temperature of some ectotherms were measured, the values would be fairly constant. Provide an explanation for such observations, giving some possible mechanisms that might be involvedThermoregulation is the process by which animals maintain an internal temperature within a tolerable range. Which of the following statement is NOT TRUE about Thermoregulation ? Lütfen birini seçin: O a. Endothermic animals generate heat by metabolism O b. Ectothermic animals gain heat from external sources O c. In general, ectotherms tolerate greater variation in internal temperature, while endotherms are active at a greater range of external temperatures O d. Ectothermy is more energetically expensive than endothermy
- Which of the following responses is an effector activated by the hypothalamus when the body temperature is lower than the set point? skin blood vessels dilate skeletal muscles contract move to a warmer location or put on a sweater weat glands initiate sweatingAutism is a condition that is generally characterized by difficulties in communicating, understanding abstract concepts, and forming relationships with other people. Recent studies show that children with autism tend to have low levels of oxytocin. Oxytocin nasal spray has been tried as a medical intervention. List two main functions of oxytocin in the body.The hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells. Its secretion is controlled by a negative-feedback system between the concentration of glucose in the blood and the insulin-secreting cells. Therefore, which of the following statements is correct? A decrease in blood glucose concentration stimulates insulin secretion, which in turn further towers blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn lowers blood glucose concentration. A decrease in blood glucose concentration stimulates insulin secretion, which in turn increases blood glucose concentration. An increase in blood glucose concentration stimulates insulin secretion, which in turn further increases blood glucose concentration. None of the preceding is correct.
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