UNC-Chapel Hill BIOL 252 - Respiratory and Urinary (4 pages)

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Respiratory and Urinary

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Respiratory and Urinary


Respiratory and Urinary

Lecture number:
Lecture Note
University of North Carolina at Chapel Hill
Biol 252 - Fundamentals of Human Anatomy and Physiology

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BIOL 252 1st Edition Lecture 21 Outline of Last Lecture I Capillary Exchange II Respiratory System III Ventilation IV Expiration is easy Outline of Current Lecture I How significant is pulmonary elasticity II Ventilation III Resistance to Airflow IV Respiratory Volumes V Restrictive Pulmonary Disorders VI Obstructive Pulmonary Disorders VII Gas exchange VIII Gas transport IX Urinary System X Kidney Function XI Nitrogenous Wastes XII Nephron Current Lecture I II III How significant is pulmonary elasticity a Pneumothorax or hemothorax is compromise of pleural membranes b Unopposed pulmonary elasticity shrinks lungs and expands pleural cavity c Two major forces elastic tissues surrounding alveoli surface tension Ventilation a When you expand your thorax expand your lungs b Go from neutral to decrease in pressure 3 mmHg Boyle s Law i Inspiration lower intrapulmonary pressure c When expire decrease volume increase pressure 3 mmHg i Higher intrapulmonary pressure 762 mmHg compared to atmospheric pressure of 760 mmHg Resistance to Airflow a Factors i Diameter of bronchi bronchioles These notes represent a detailed interpretation of the professor s lecture GradeBuddy is best used as a supplement to your own notes not as a substitute IV V VI 1 Bronchoconstriction ACh cold air irritants histamine resting position a Why keep narrow under resting conditions b Smaller cross sectional diameter smaller volume i Anatomical dead space all of the air not involved in gas exchange if must move larger volume of air more work smaller volume more proportionally gets to alveoli 2 Bronchodilation catecholamines E NE sympathetic nervous system a Increase diameter decreases resistance increases flow b Advantage to getting air in more quickly exchange of gases quicker ii Pulmonary compliance 1 Compliant lungs expand easily with expansion of thorax 2 With aging fibrosis more rigid lungs not as compliant a To pull in same volume must work harder for each breath iii Surface tension w in alveoli 1

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