# 6.2 study guide.docx - BIO 265 Section 6.2 Study Guide...

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BIO 265 Section 6.2: Study Guide Section 6.2 Objectives: Explain how ventilation occurs and how the pressures influence inhalation and exhalation. Discuss the main factors and laws that influence the rate at which gasses will cross the respiratory membrane. 6.2 – RESPIRATORY PRESSURES Explain how ventilation occurs and how the pressures influence inhalation and exhalation. Air flows from high pressure to low pressure. Flow = (p1-p2 )/R Atmospheric pressure is greater than lungs pressure so air enters Resting conditions- 12 breaths per min. Inspiration- air from external environment to lungs Expiration- air from lungs out to environment o Understanding the respiratory system requires combining the understanding of several physical laws to explain how air flows. As you learn about these laws fill out the Laws of Respiration charts contained in this study guide: Resources: Airway Resistance - system/ventilation/airway-resistance/ Poiseuille’s Law: Laws of Respiration: Poiseuille’s Law One-liner description of this law: The diameter of the tube has greatest influence on resistance. Inversely proportional. As diameter goes up resistance goes down…the greater the difference of the two pressures the lower the resistance in the tube. The faster the air will flow. Formula: Flow = (p1-p2) divided by Radius Draw your own picture illustrating this law: Principles that are important in Define pressure gradient. Page 1
BIO 265 understanding this law: o Fill in the blank: Air always flows from ____________ to ___________ pressure. Define resistance. o What can contribute to resistance in the respiratory tract?