Quiz 11 Flashcards
Which process is responsible for the movement of oxygen from the alveoli into the blood of the pulmonary capillaries?
- Active Transport
- Filtration
- Osmosis
- Diffusion
Diffusion
What is the amount of air that normally moves into (or out of) the lungs with each respiration called?
Tidal volume
Pulmonary surfactant:
- Can be deficient in premature newborns.
- Is produced by Type II alveolar cells (pneumocytes)
- Decreases surface tension of the fluid lining the alveoli
Most of the CO2 transported in the blood is:
- Dissolved in plasma.
- In carbamino compounds formed from plasma proteins.
- In carbamino compounds formed from hemoglobin.
- Diffused into RBCs and is converted into H2CO3 which is then dissociated into H+ and HCO3.
Diffused into RBCs and is converted into H2CO3 which is then dissociated into H+ and HCO3.
The site of exchange of gases in the lungs takes place in the:
- Glomerulus
- Alveolus
- Pleura
- Epiglottis
Alveolus
During anesthesia and while breathing 100% oxygen, an animal’s ventilation rate may slow down due to
Inhibition of the peripheral respiratory chemoreceptors located in the aortic arch and carotid bodies.
Most oxygen carried in the blood is:
- Combined with plasma proteins.
- In solution in the blood plasma.
- Chemically combined with heme in the red blood cells.
- Dissovlved in the cytoplasm of the RBC
Chemically combined with heme in the red blood cells
The glossopharyngeal (IX) and vagus (X) cranial nerves function to control respiration through:
- Sending sensory impulses from aortic and carotid bodies to the dorsal respiratory group.
- Inhibiting the diaphragm from contracting.
- Sending sensory impulses from the muscle stretch receptors to the dorsal respiratory group.
- Stimulating lower motor neurons to the external intercostal muscles.
Sending sensory impulses from aortic and carotid bodies to the dorsal respiratory group.
The Pneumotaxic Center:
- Is located in the medulla oblongata.
- Regulates respiration in response to changes in PO2.
- Functions to inhibit respiration/deep inspiration
Functions to inhibit respiration/deep inspiration
At the level of the peripheral tissues, oxygen enters the tissues from capillaries because:
- The affinity of the hemoglobin molecule to oxygen becomes less.
- The blood flow slows down due to reduce blood pressure.
- The partial pressure of O2 is greater in the tissues than in the capillary blood.
The affinity of the hemoglobin molecule to oxygen becomes less.
