Which of the following scenarios describes a positive feedback mechanism? After eating, blood glucose levels rise, stimulating the release of insulin from the pancreas. Insulin causes cells to uptake glucose from the blood, lowering blood glucose levels. After childbirth, high levels of prolactin induce lactation in the mother. During nursing, infant suckling triggers the release of more prolactin, which further stimulates lactation. During exercise, an increase in body temperature causes the body to produce sweat. As the sweat vaporizes, the body cools down due to evaporative cooling. Several hours after a meal, blood glucose levels begin to drop, prompting the pancreas to secrete glucagon. Glucagon causes the liver to convert stored glycogen into glucose, raising blood glucose levels.

Which of the following scenarios describes a positive feedback mechanism? After eating, blood glucose levels rise, stimulating the release of insulin from the pancreas. Insulin causes cells to uptake glucose from the blood, lowering blood glucose levels. After childbirth, high levels of prolactin induce lactation in the mother. During nursing, infant suckling triggers the release of more prolactin, which further stimulates lactation. During exercise, an increase in body temperature causes the body to produce sweat. As the sweat vaporizes, the body cools down due to evaporative cooling. Several hours after a meal, blood glucose levels begin to drop, prompting the pancreas to secrete glucagon. Glucagon causes the liver to convert stored glycogen into glucose, raising blood glucose levels.

Human Physiology: From Cells to Systems (MindTap Course List)

9th Edition

ISBN:9781285866932

Author:Lauralee Sherwood

Publisher:Lauralee Sherwood

Chapter1: Introduction To Physiology And Homeostasis

Section: Chapter Questions

Problem 3TAHL: The hormone insulin enhances the transport of glucose (sugar) from the blood into most body cells....

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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.
Identify the follow as either negative or positive feedback. The pancreas producing insulin to decrease blood sugar after a meal. Clotting factors in the blood triggering the release of more clotting factors after damage to a blood vessel. Contractions in childbirth resulting in labor and delivery.
An example of negative feedback mechanism is the control of blood glucose levels by insulin. A __________ in blood glucose leads to the pancreas secreting insulin that promotes __________ of glucose from the bloodstream. fall; release fall; removal rise; removal rise; release none of the above
The graph shows the blood-glucose levels and insulin levels of an individual. Blood-glucose levels are controlled by a feedback loop that involves the hormone insulin. Which of the following statements best explains the role of insulin in this feedback loop? Insulin controls the blood-glucose level in a positive feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to raise the blood-glucose level even higher. Insulin controls the blood-glucose level in a negative feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to raise the blood-glucose level even higher. Insulin controls the blood-glucose level in a positive feedback loop. As the level of blood glucose rises above a normal set point, the level of insulin increases to lower blood-glucose back to the normal level. Insulin controls the blood-glucose level in a negative feedback loop. As the level of blood glucose…
Jamie has fallen ill. Her body temperature has risen to high levels. Her blood pressure is high and her glucose level is low. In order for her body to return to homeostasis and for Jamie to feel better, the following events are taking place: Select all that apply Dilating blood vessels reduce blood pressure Lowering her body temperature by sweating Raise her body temperature by sweating Apply positive feedback to restore glucose levels in the blood stream by using the hormone glucagon which will raise blood sugar Apply negative feedback to restore glucose levels in the blood stream by using the hormone glucagon which will raise blood sugar Constricting blood vessels to increase blood pressure
Which of the following is an example of negative feedback? a The uterine contractions during childbirth push the baby's head against the cervix which stimulates the uterus to contract b The release of platelets that aggregate at the site of a blood vessel injury c "As blood sugar level rises, insulin is released which promotes the absorptiom of glucose from the blood by liver, muscle and fat cells" d None of the above
A number of hormones in the body are responsible for controlling blood glucose levels. Some examples include insulin, glucagon, adrenaline, and cortisol.Select the FOUR numbers below that correctly show the pathway for insulin. Insulin is secreted when blood sugar levels are high. Insulin is secreted when blood sugar levels are low. Insulin is released from the beta cells of the pancreas. Insulin is released from the alpha cells of the pancreas. Insulin makes cells more permeable to glucose. Insulin makes cells less permeable to glucose. Glycogen is taken up and converted to glucose. Glucose is taken up and converted to glycogen.
An example of negative feedback in a homeostatic system is: seeing a drug-related cue results in drug-seeking restoring the desired blood sugar level turns off the hormonal response activation of the amygdala increases activation of the HPA axis. insulin release after eating a meal.
Which is an example of negative feedback? lowering of blood glucose after a meal blood clotting after an injury lactation during nursing uterine contractions during labor nausea leading to vomiting
Select the 4 statements that correctly describe positive feedback pathways. A sensor/receptor is required to monitor and limit levels. A sensor/receptor is unnecessary to monitor and limit levels. Feedback prevents homeostasis. Feedback contributes to homeostasis. Feedback stimulates the effector to continue to do the same thing. Feedback stops the effector from doing one thing and stimulates it to do the opposite. When the target level for a hormone is reached, feedback results in a reduction of that hormone being released. When a target level for a hormone is reached, feedback results in an increase of that hormone being released.
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