Test 3 Flashcards
PO2 is about _____ in tissues and _____in alveolar air.
40 mmHg, 100 mmHg
Which is a factor that does NOT affect hemoglobin’s affinity for oxygen?
- pH of blood
- the rate of respiration
- amount of oxygen available
- temperature
- none
- partial pressure of oxygen
2
This is the primary gas exchange site
Type 1 cells of the alveolus
At rest, blog returning to the left side of the heart is ____% saturated with 02.
100
The expiratory reserve is the amount of air:
that you can forcefully exhale
These are cells of the alveoli that produce surfactant
Type II alveolar cells
This means the lungs and the chest wall do not expand easily.
Low compliance
Which of the following impact the rate of pulmonary and systemic gas exchange.
- partial pressure difference of the gases
- surface area for gas exchange
- diffusion distance
- molecular weight and solubly of the gases
- All of the above
5
Which enzyme aids in your ability to digest lipids?
Lipase
In the medullary rhythmicity area, the expiratory area establishes the basic rhythm of quiet breathing, while the inspiratory area remains inactive. True or false?
False
What keeps us from digesting our own stomach?
an alkaline mucus lining secreting by cells in the stomach
23% of O2 and 98.5% of CO2 is transported attached to Hb. True or False?
False
Which of the following processes is the function of the smooth muscle layer of the digestive system?
Mixing and propulsion
After mixing with digestive juice in the stomach, food is called:
chyme
Which is the dominant method of carbon dioxide transport?
as bicarbonate ions
The conducting airways with the air that does not undergo respiratory exchange are known as the
Respiratory dead space
When blood pH drops (increasing acidity) then the amount of oxyhemoglobin ______ and oxygen delivery to the tissue cells _______.
decreases, increases
During normal, quiet breathing exhalation begins when
Inspiratory muscles relax
Hemoglobin can unload more oxygen in metabolically active tissues than in tissues at rest because
Increasing body temperature decreases the affinity of hemoglobin for oxygen.
Which of the following secrete HCl?
Parietal cells
Because we use carbs as energy, we can absorb molecules of starch without breaking them down into their smaller monosaccharide building blocks. True or False?
False
If you were to take 10 breaths/min and inhaled about 600 mL/breath, your minute ventilation rate would be
6000mL/min
The inspiratory area coordinates the shift from inhalation to exhalation by stimulating the apneustic region. True or False?
False
The following muscles contract to results in normal, quiet exhalation
- the external intercostals and diaphragm
- the abdominals and internal intercostals
- the scaliness
- None
4
Why do emotions such as anger or fear slow digestion?
Because they stimulate the sympathetic nerves that supply the GI tract