The depth of respiration increases, and a person may breathe through an open mouth instead of through the nasal passageways. If blood glucose concentration drops below this range, glucagon is released, which stimulates body cells to release glucose into the blood. Therefore, to maintain an adequate oxygen level in all of the tissues in your body, you breathe more deeply and at a higher rate when you exercise. Biology Dictionary. These responses use different effectors to adjust the variable. Instead of reversing it, positive feedback encourages and intensifies a change in the bodys physiological condition, actually driving it farther out of the normal range. * Oxytocin carried in bloodstream to uterus Following a penetrating wound, the most immediate threat is excessive blood loss. The level of a sex hormone, testosterone (T), is controlled by negative feedback. Prolactin normally stimulates milk production, but during pregnancy, progesterone inhibits milk production. If the temperature is too hot, then the electronic interface triggers the air-conditioning unit to turn on. This positive feedback loop continues until the baby is born. For instance, body temperature varies over a 24-hour period, from highest in the late afternoon to lowest in the early morning. Control centers in the brain and other parts of the body monitor and react to deviations from homeostasis using negative feedback. Explain your answer. Your muscles use the energy stored in ATP molecules to generate the force they need to contract. Khan Academy For example, pupillary diameter is adjusted to make sure an appropriate amount of light is entering the eye. From body temperature to blood pressure to levels of certain nutrients, each physiological condition has a particular set point. 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