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Stack #4107279
| Question | Answer |
|---|---|
| Volume of air inspired and expired can be described as and is in respect to what? | "Tightly controlled" Frequency of breaths and tidal volume |
| In regards to the Cerebral Cortex, what can it temporarily do in regards to the Brainstem? | temporarily override Brainstem centers |
| When "HYPERventilation" occurs, what happens to the breathing frequency and PCO2? | DECREASE in PCO2 increased breathing frequency |
| When "HYPOventilation" occurs what happens to the PCO2 and PO2? | INCREASED PCO2 DECREASED PaO2 |
| How do Chemoreceptors control breathing? | Processing sensory info such as PaO2, PCO2, Arterial pH |
| What are the two types of chemoreceptors? | Central and Peripheral |
| Function of Central Chemoreceptors | control of minute to minute breathing |
| Where are central chemoreceptors located? | Brain (Medullary Respiratory Center) |
| Function of Peripheral Chemoreceptors | detect decrease in Arterial PO2 AND Increase in PCO2 |
| Peripheral chemoreceptors are insensitive to changes in PO2 but respond when.... | PO2 is less than 60 mmHg or above 100mmHg |
| What happens when there is a DECREASE in arterial pH and what controls this? | Ventilation INCREASES peripheral chemoreceptors for H+ |
| What are the names of other receptors ? (4) | Lung Stretch Receptors Irritant receptors joint and Muscle receptors J- receptors |
| What type of receptor is a Lung stretch receptor and where is it found? | MECHANORECEPTOR - smooth muscle of lungs |
| What activates Lung Stretch Receptors? | "DISTENTION"(stretch) of lungs and airway |
| What is the name of the protective mechanism the lungs use which results in DECREASE in breathing rate? | Herring-Breur Reflex |
| What type of receptor is the "Joint and Muscle Receptor" and where is it located | Mechanoreceptor -duh its in the name |
| Where are J- receptors located ? | Near alveolar walls aka capillaries |
| What activates J-receptors? | INCREASE in Interstitial Fluid volume due to pulmonary capillary being filled with blood |
| Activation of J receptors results in ? | INCREASE Ventilation to allow for more exchange |
| Exercise causes an increase in | INCREASE O2,CO2, ventilation |
| INCREASE IN O2 is caused by | increased O2 consumption and ventilation |
| What 4 things are affected due to exercise? | O2-Hgb curve arterial blood venous blood pulmonary BF |
| What is "hypoxemia"? | DECREASE in Arterial PO2 |
| What are some causes of hypoxemia? | high altitude hypoventilation fibrosis R-L shunt |
| Can hypoxemia cause hypoxia? | YES! |
| What is Hypoxia? | DECREASE in O2 delivery or use in tissues |
| What are some causes of Hypoxia? | decrease in Cardiac Output Anemia poisioning( CO and cyanide) |
| During exercise how does the affinity for oxygen change? | Decreases and shifts the curve to the right |
| Where are the irritant receptors located? | in the epithelial cells of the airways |
Created by:
AkinaDPT26
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