8. Thermoregulation is keeping the body's temperature controlled or regulated.
9. The portion of the brain that contains sensors that monitor body temperature is the hypothalamus.
10. a) Two mechanisms the body uses to cool itself are the blood vessels dilating to radiate heat, and sweat glands increasing to increase sweat production.
b) Two mechanisms the body uses to heat itself are the blood vessels constrict, reducing heat, and muscles beginning to shiver, generating heat.
11. a) The signal in the feedback loop would be the hypothalamus sensing that the body temperature is too high sending signals to cool the body. The response is the blood vessels dilating (chemical signal), and sweat glands increasing sweat production to radiate heat …show more content…
a) The signal in the feedback loop would be the hypothalamus sensing that the body temperature is too low, sending signals to heat the body. The response is the blood vessels constricting (chemical signal), and the muscles beginning to shiver (electrical signal). The stimulus would be that the body temperature increases.
b) the feedback loop is positive feedback because the body temperature increases. Normally the body is 37 degrees Celsius, and it is much lower than that so the body temperature must increase.
13. a) Yes, a positive feedback loop will be helpful in maintaining homeostasis because if a male's testosterone levels are too low, then a positive feedback loop will increase them to maintain homeostasis.
b) When you have too much oxygen, your brain sends signals to your body to exhale more often. you normally have about 98-99% of oxygen in your body, and when you have more than this, your body will use a negative feedback loop to decrease the levels of oxygen and maintain homeostasis.
14. The signal is the hypothalamus releasing oxytocin. The response to the signal is the contracting of the uterine walls. The stimulus is the baby pushing against the …show more content…
a) The stimulus is the human tissue that is torn or cut. The signal is the cells near the damaged area send an alert that activates platelets in the vicinity.The response is the plug formed by platelets used to stop the bleeding. This is an example of negative feedback, because the plug is used to decrease the bleeding.
b) The stimulus is a person not drinking enough water resulting in dehydration. The response is a loss of blood pressure, which triggers the release of antidiuretic hormone from the hypothalamus and the pituitary glands. The signal is that the hormone tells the kidney to allow reabsorption of water by the blood vessels. This is an example of positive feedback, because the hormone increases the blood pressure back to normal conditions.
c) The stimulus is a human increasing physical activity, thus making the amount of fuel burned in its cells to increase as well. This increases the concentration of dissolved CO2 in the blood. The response is the CO2 reacting with water in the blood to make a weak acid, which lowers the pH of the blood. The signal is the sensory cells in the medulla of the brain registering this decrease in pH and in turn sends signals to the diaphragm and heart to increase respiration. This is an example of positive feedback because the sensory cells increase
9. The portion of the brain that contains sensors that monitor body temperature is the hypothalamus.
10. a) Two mechanisms the body uses to cool itself are the blood vessels dilating to radiate heat, and sweat glands increasing to increase sweat production.
b) Two mechanisms the body uses to heat itself are the blood vessels constrict, reducing heat, and muscles beginning to shiver, generating heat.
11. a) The signal in the feedback loop would be the hypothalamus sensing that the body temperature is too high sending signals to cool the body. The response is the blood vessels dilating (chemical signal), and sweat glands increasing sweat production to radiate heat …show more content…
a) The signal in the feedback loop would be the hypothalamus sensing that the body temperature is too low, sending signals to heat the body. The response is the blood vessels constricting (chemical signal), and the muscles beginning to shiver (electrical signal). The stimulus would be that the body temperature increases.
b) the feedback loop is positive feedback because the body temperature increases. Normally the body is 37 degrees Celsius, and it is much lower than that so the body temperature must increase.
13. a) Yes, a positive feedback loop will be helpful in maintaining homeostasis because if a male's testosterone levels are too low, then a positive feedback loop will increase them to maintain homeostasis.
b) When you have too much oxygen, your brain sends signals to your body to exhale more often. you normally have about 98-99% of oxygen in your body, and when you have more than this, your body will use a negative feedback loop to decrease the levels of oxygen and maintain homeostasis.
14. The signal is the hypothalamus releasing oxytocin. The response to the signal is the contracting of the uterine walls. The stimulus is the baby pushing against the …show more content…
a) The stimulus is the human tissue that is torn or cut. The signal is the cells near the damaged area send an alert that activates platelets in the vicinity.The response is the plug formed by platelets used to stop the bleeding. This is an example of negative feedback, because the plug is used to decrease the bleeding.
b) The stimulus is a person not drinking enough water resulting in dehydration. The response is a loss of blood pressure, which triggers the release of antidiuretic hormone from the hypothalamus and the pituitary glands. The signal is that the hormone tells the kidney to allow reabsorption of water by the blood vessels. This is an example of positive feedback, because the hormone increases the blood pressure back to normal conditions.
c) The stimulus is a human increasing physical activity, thus making the amount of fuel burned in its cells to increase as well. This increases the concentration of dissolved CO2 in the blood. The response is the CO2 reacting with water in the blood to make a weak acid, which lowers the pH of the blood. The signal is the sensory cells in the medulla of the brain registering this decrease in pH and in turn sends signals to the diaphragm and heart to increase respiration. This is an example of positive feedback because the sensory cells increase