Question: Exercise 1: Positive and Negative Feedback In this exercise, you will identify positive and negat…
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Show transcribed image text Exercise 1: Positive and Negative Feedback In this exercise, you will identify positive and negative feedback and determine the stimulus, receptor, control center, effector, and response for various stimuli. You will describe how each form of regulation contributes to maintaining homeostasis in the body. 1. Read each of the following scenarios: Scenario 1: The Body is too Hot Temperature in the body is sensed by the hypothalamus, an area of the brain that regulates hormones that address not only temperature, but also hunger, moods, sleep, and sex drive When a person becomes too hot, they begin to sweat which reduces the temperature of the body through evaporative cooling. The blood vessels in the skin dilate so warm blood is closer to the surface of the skin Scenario 2: The Body is too Cold When a person becomes too cold, blood vessels in the skin constrict to conserve heat. A person may begin to shiver which is an involuntary contraction of muscles that generates heat. Scenario 3: Blood Glucose Levels Elevate Cells of the pancreas (an organ located in the abdomen that is part of the digestive system) determine the set point for blood glucose (blood sugar). After a meal, glucose levels are elevated and the pancreas detects the change and produces insulin. Insulin and glucose move into the bloodstream where they are transported to different areas of the body. The insulin allows glucose to move from the bloodstream into the muscles and liver where the glucose is stored or used as energy for cellular work. Scenario 4: Blood Glucose Levels Decrease When glucose levels are low, the pancreas produces glucagon which signals the release of stored glucose. Scenario 5: The Body's Epithelium Sustains an Injury When the body sustains an injury, such as a cut, scrape, or burn, a message is sent to the brain that an injury has occurred. As a result of the injury, blood vessels break and blood flows into the wound. Proteins and platelets in the blood help to form a clot or scab and epithelial cells are regenerated
Exercise 1: Positive and Negative Feedback In this exercise, you will identify positive and negative feedback and determine the stimulus, receptor, control center, effector, and response for various stimuli. You will describe how each form of regulation contributes to maintaining homeostasis in the body. 1. Read each of the following scenarios: Scenario 1: The Body is too Hot Temperature in the body is sensed by the hypothalamus, an area of the brain that regulates hormones that address not only temperature, but also hunger, moods, sleep, and sex drive When a person becomes too hot, they begin to sweat which reduces the temperature of the body through evaporative cooling. The blood vessels in the skin dilate so warm blood is closer to the surface of the skin Scenario 2: The Body is too Cold When a person becomes too cold, blood vessels in the skin constrict to conserve heat. A person may begin to shiver which is an involuntary contraction of muscles that generates heat. Scenario 3: Blood Glucose Levels Elevate Cells of the pancreas (an organ located in the abdomen that is part of the digestive system) determine the set point for blood glucose (blood sugar). After a meal, glucose levels are elevated and the pancreas detects the change and produces insulin. Insulin and glucose move into the bloodstream where they are transported to different areas of the body. The insulin allows glucose to move from the bloodstream into the muscles and liver where the glucose is stored or used as energy for cellular work. Scenario 4: Blood Glucose Levels Decrease When glucose levels are low, the pancreas produces glucagon which signals the release of stored glucose. Scenario 5: The Body's Epithelium Sustains an Injury When the body sustains an injury, such as a cut, scrape, or burn, a message is sent to the brain that an injury has occurred. As a result of the injury, blood vessels break and blood flows into the wound. Proteins and platelets in the blood help to form a clot or scab and epithelial cells are regenerated
