When a person exercises, many body systems make movement and homeostasis possible at the same time. This loop involves providing oxygen to andremoving carbon dioxide from the blood and body tissues.As we go about our daily tasks, sensory cells in the medulla oblongata (brain stem) constantly sense the concentration of carbon dioxide in our spinal fluid. Thetypical set point is about 1.45 ml CO₂/liter of blood. When our activity levels increase, muscles use oxygen and emit carbon dioxide faster. This causes the[CO₂] in our blood to increase. This CO₂ diffuses into the spinal fluid and travels to the medulla oblongata. When the medulla senses an increase in CO₂, itsends nerve impulses to the diaphragm, causing it to contract more deeply and more often, bringing increased oxygen to the lungs and expelling carbon dioxideat a faster rate. At the same time, impulses are sent to the heart's pacemaker tissue, causing the heart to contract more frequently to pick up CO₂ from tissuesfaster to go back to the lungs and get oxygen from the lungs to the tissues faster, as well. We will continue breathing at this increased rate until the [CO₂] in ourblood decreases. As the [CO₂] decreases in the blood, less will diffuse into the spinal fluid, the medulla will detect a decrease in carbon dioxide, and ceasesending signals that speed the breathing and heart rates.Now, use your new knowledge to summarize the sequence of events for the diagram to show the homeostatic mechanism at work to maintain proper CO₂and O₂ levels.2.I3.Increase in Variable1.CI:: High CO2 levels are sensed by medulla oblongata.Decrease in CO2 levels, the heart and breathing ratesare begin to decrease.4.CO2 levels have reached the set point. The heart andlungs are functioning at their normal rate.Nerve impulses are sent by the medulla oblongata tostimulate increased activity of the heart anddiaphragm. removing carbon dioxide from the blood and body tissues.As we go about our daily tasks, sensory cells in the medulla oblongata (brain stem) constantly sense the concentration of carbon dioxide in our spinal fluid. Thetypical set point is about 1.45 ml CO₂/ liter of blood. When our activity levels increase, muscles use oxygen and emit carbon dioxide faster. This causes the[CO₂] in our blood to increase. This CO₂ diffuses into the spinal fluid and travels to the medulla oblongata. When the medulla senses an increase in CO2, itsends nerve impulses to the diaphragm, causing it to contract more deeply and more often, bringing increased oxygen to the lungs and expelling carbon dioxideat a faster rate. At the same time, impulses are sent to the heart's pacemaker tissue, causing the heart to contract more frequently to pick up CO2 from tissuesfaster to go back to the lungs and get oxygen from the lungs to the tissues faster, as well. We will continue breathing at this increased rate until the [CO₂] in ourblood decreases. As the [CO₂] decreases in the blood, less will diffuse into the spinal fluid, the medulla will detect a decrease in carbon dioxide, and ceasesending signals that speed the breathing and heart rates.Now, use your new knowledge to summarize the sequence of events for the diagram to show the homeostatic mechanism at work to maintain proper CO₂and O₂ levels.2.3.Increase in Variable1.II:: High CO2 levels are sensed by medulla oblongata.Decrease in CO2 levels, the heart and breathing ratesare begin to decrease.4.CO2 levels have reached the set point. The heart andlungs are functioning at their normal rate.::Nerve impulses are sent by the medulla oblongata tostimulate increased activity of the heart anddiaphragm.

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The rhythmic pattern of breathing is carried out by four separate respiratory centres located in the…