The lungs perform other :physiologic functions Play secondary role in heat exchange and fluid balance of the body by warming the air we breathe in (inspire).
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- Breathing _______. a. ventilates the lungs b. draws air into airways c. expels air from airways d. causes reversals in pressure gradients e. all of the aboveDue to its partial pressure gradient, carbon dioxide diffuses from cells into tissue fluid and into the ________; in the lungs, carbon dioxide diffuses into the ________. a. alveoli; bronchioles b. bloodstream; bronchioles c. alveoli; bloodstream d. bloodstream; alveoliThe respiratory components of the medulla consist of which of the following? Dorsal respiratory group Apneustic center Ventral respiratory group Pneumotaxic center 1 only 2 only 1 and 3 only 2 and 4 only
- After oxygen diffuses into lung capillaries, it also diffuses into _______ and binds with _______. a. tissue fluid; red blood cells b. tissue fluid; carbon dioxide c. red blood cells; hemoglobin d. red blood cells; carbon dioxideOf the following, which does not explain why the partial pressure of oxygen is lower in the lung than in the external air? Air in the lung is humidified; therefore, water vapor pressure alters the pressure Carbon dioxide mixes with oxygen Oxygen is moved into the blood and is headed to the tissues Lungs exert a pressure on the air to reduce the oxygen pressure.In______, gas exchange occurs at the body surface and gas is distributed by diffusion alone. a. earthworm c. frogs b. flatworms d. insects
- Underwater, we humans cant compete with whales and other air-breathing marine mammals, which can stay submerged for extended periods. At the beach one day you meet a surfer who tells you that special training could allow her to swim underwater without breathing for an entire hour. From what you know of respiratory physiology, explain why she is mistaken.In a negative feedback control of respiration, a high level of carbon dioxide in the blood stimulates chemoreceptors. The chemoreceptors then send information to the medulla in the brainstem. The medulla than stimulates an increase in respiratory rate. The integrator in this system is the: Chemoreceptor Carbon dioxide O Lungs Respiratory muscles None of the aboveVentilatory threshold is the point at which an individual's ventilation becomes coupled to oxygen need an individual begins to produce lactate an individual's breathing becomes coupled to their need to buffer acidosis an individual reaches their VO2 max
- After your exercise routine at the gym, you sit with friends drinking a glass of water to cool off. Select a single word from list and place into each blank to make it correct. Not all terms will be used. 40 mmHg right increases As you cool off, metabolism at the skeletal muscles decreases, and the oxygen saturation curve shifts affinity for oxygen because hemoglobin's . Under these conditions, hemoglobin 20% is likely to release oxygen. decreases At the same time, the partial pressure of oxygen at the systemic capillaries changes from about to less Carbon dioxide released from the skeletal muscle cells during vigorous exercise can make the blood slightly more acidic. This results in hemoglobin having a affinity. left oxygen saturation or oxygen higher 40% 20 mmHg lower moreWhich of the following control breathing? select all that apply Centers in the Pons and Medulla control breathing Respiratory centers respond to changes in acid base Chemoreceptors respond to a decrease in oxygen Chemoreceptors are located in the heart and lungsWhich of the following is a phase of human respiration? Ventilation Gas exchange Oxygen utilization O All of the above