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A&PII unit 2 quizzes
Terms in this set (21)
Surfactant is produced (early/late) in fetal development
During inspiration, intrapulmonary pressure is (</>/=) the atmospheric pressure
-during inspiration intrapulm. vol increases and intrapulm. P decreases, so intrapulm. P becomes less than ATM P
Intrapleural pressure needs to be ______ in order for the lungs to inflate.
negative compared to the intrapulmonary P
When partial pressure of CO2 decreases in your blood, what happens to the affinity of the Hb for O2? (hint: this is the opposite effect of increased CO2 in blood)
Affinity will increase
A patient has a structuarally different Hb and this Hb has a LEFT-shifted oxygen Hb dissociation curve compared to someone with regular Hb. Hb of this patient releases O2 to the tissue more or less easily?
less easily compared to Hb of a healthy person
When blood pH surrounding cells increases (=becomes more basic), this will shift the O2-Hb dissociation curve to the __________, __________ affinity of Hb for O2.
Where is/are enzymes for fat digestion secreted from?
-mouth (lingual lipase)
-stomach (gastric lipase from chief cells)
-pancreas (pancreatic lipase)
Where are nucleotides digested at (hint: where is/are enzymes secreted into)? Choose all that apply.
small intestine - Brush Border Enzyme: NUCLEOSIDASE
soapy substance that breaks down water tension in alveoli.
-keeps alveoli from collapsing
what age do you think babies have high risk of respiratory distress syndrome? Treatments?
-Higher risk of respiratory distress syndrome when babies are younger than 34 to 35 weeks of gestation.
-Maternal steroids before birth promotes fetal lung maturation leading to increased air space and increased production of surfactant-associated proteins and exogenous surfactant for infant.
-Therapeutic supplemental O2 is possible but too much oxygen can damage eyes, lungs, and brain.
Intrapulm pressure @ start of inspiration
Intrapulm pressure @ middle of inspiration
Intrapulm pressure @ start of expiration
Intrapulm pressure @ middle of expiration
Intrapleural pressure @ start of inspiration
Intrapleural pressure @ middle of inspiration
Intrapleural pressure @ start of expiration
Intrapleural pressure @ middle of expiration
You blew birthday candles as hard as you can. The volume of air that is left in your lungs after blowing the candles is called
How is blood pH affected by pneumothorax?
Because ventilation cannot occur in the lung. As a result, O2 levels in pulmonary capillaries drop and CO2 levels in pulmonary capillaries increase (less CO2 can be expired). This explains a lower O2 saturation in the blood. High levels of CO2 create more H+ ions (CO2 + H2O -> H+ + HCO3-). This lowers blood pH.
Difference between anatomical dead space and residual volume
-Anatomical dead space is the air that is stuck in conducting zone, from mouth to terminal bronchioles. The air in the conducting zone or dead space does not exchange with pulmonary capillaries.
-Residual volume is the volume of air that is in the lungs (alveoli) after you breathe out as much air as possible. This air can exchange with pulmonary capillaries.
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