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The Respiratory System Chapter 12
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The Respiratory System has two Major Responsibilities Supply the blood (and ultimately the tissues) with O2. Remove CO2 Simply stated: Respiration involving breathing O 2 in and expelling CO 2 . However, it’s more complicated than that.
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The term respiration has a broad meaning. Internal Respiration: within the body External Respiration: involves movement of air and gasses into and out of the lungs.
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Internal Respiration Internal respiration refers to the metabolic processes occurring in the mitochondria. Molecular oxygen is used by tissue cells. Carbon dioxide is produced.
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External Respiration The sequence of events involved in the exchange of O 2 and CO 2 between the external environment and body’s cells. It includes: Breathing: air moved between the atmosphere and Lungs (alveoli). Gasses exchanged between the lungs and the blood. Movement of gasses between the lungs and the
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There are four parts or steps in the Respiration Process 1. Pulmonary Ventilation 2. Pulmonary Diffusion 3. Blood/Gas Transport 4. Gas/Tissue Exchange Actually only the first two are respiration. However, the second two are best considered here under the topic of respiration.
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Atmosphere Tissue cell Alveoli of lungs Pulmonary circulation Systemic circulation CO 2 O 2 Food + O 2 CO 2 + HO 2 + ATP O 2 CO 2 CO 2 O 2 1 Steps of external respiration PULMONARY VENTILATION Gas exchange between the atmosphere and air sacs (alveoli) in the lungs PULMONARY DIFFUSION Exchange of O 2 and CO 2 between air in the alveoli and the blood BLOOD/GAS TRANSPORT Transport of O 2 and CO 2 between the lungs and the tissues GAS TISSUE EXCHANGE Exchange of O 2 and CO 2 between the blood and the tissues Internal respiration 2 3 4
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Each Step Has Two Parts or Halves. •The first half involves getting O 2 into the body. •The second half involves getting CO 2 out of the body.
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1st: Getting O 2 into the body 1. O 2 from the atmosphere into lungs (alveoli). (Pulmonary Ventilation) 2. O 2 from the alveoli into pulmonary capillaries. (Pulmonary Diffusion) 3. O 2 from lungs (pulmonary capillaries) to the tissues (blood/gas transport) 4. O 2 from blood into the tissues. (Blood/ gas tissue exchange)
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2nd: CO 2 out of the body (reverse order) 4. CO 2 from the tissues to the blood. (blood/ gas tissue exchange) 1. CO 2 from the tissues to the lungs (blood/gas transport) 2. CO 2 from the pulmonary capillaries to the alveoli. (Pulmonary Diffusion) 1. CO 2 from the lungs (alveoli) to the
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The respiratory system carries out non-respiratory functions. It provides a route for water loss and heat elimination. It enhances venous return. It contributes to the maintenance of normal
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view-10.php - The Respiratory System Chapter 12 The...

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