A healthy, resting patient with normal lungs at sea level is breathing 50% oxygen. What is the most likely alveolar PO,? O 100 mmHg 310 mmHg O 149 mmHg

A person breathing room air has an alveolar PO2 of 105 mmHg and an arterial PO2 of 80 mmHg. Could hypoventilation due to, say, respiratory muscle weakness produce these values?

List the approximate partial pressures for Oxygen and Carbon Dioxide:   Location O2 CO2 Atmosphere     Alveolus     Arterial Blood     Venous Blood

Alveolar pressure has the following characteristics (select all that apply): O It is always a negative pressure relative to atmospheric pressure. As the volume of the lungs decreases, the alveolar pressure within the lungs decreases. OAs the volume of the lungs increases, the alveolar pressure within the lungs decreases. OIt can be a negative pressure or a positive pressure relative to atmospheric pressure. O It is the pressure within the space between the parietal and visceral pleura.

Which of the following lung volumes can be measured using spirometry?  expiratory reserve volume  tidal volume  inspiratory reserve volume residual volume vital capacity

The PO2 in the alveolar space is [ Choose than the PO2 in the capillaries entering the alveoli. [Choose ) less than greater than equal to 02 the alveolar capillaries. leaves enters The PCO2 in the alveolar space is than the PC02 in the capillaries entering the alveoli. [ Choose ] CO2 the alveolar capillaries. [ Choose The PO2 in the tissues is than the PO2 in the capillaries entering the tissues. [ Choose ) 02 the tissue capillaries. [ Choose The PCO2 in the tissues is than [ Choose ) the PC02 in the capillaries entering the tissues. CO2 the tissue capillaries. [ Choose ) > > > > >

Expired air considered as a whole (not just the last 10 mL) is about 15.3% O2 and 4.2% CO2.  Why would these values differ from the ones for alveolar air?

The volume of air flow to the alveoli is increased when there is an increase in: Group of answer choices the expiratory reserve volume bronchial spasms collapsed lung tissue the diameter of the airways airway resistance

Which of the following is likely to occur when decreasing the expiratory positive airway pressure in the patient being ventilated using noninvasive ventilation?  Improved PaO2 Increased functional residual capacity Increased tidal volume Increased inspiratory positive airway pressure

The two power point slides in this activity illustrate gas exchange in the lungs (external respiration) tissues (internal respiration). Each slide shows a cell (either tissue cell or alveolar cell) at the top and a blood vessel (with plasma and RBC) below. To complete the activity: 1. Determine which illustration is external respiration and which is internal respiration. You must do this first so that you wil use the correct description to label each slide. 2. On each slide, drag the cell name (either tissue cell or alveolus) onto the cell at the top. 3. Read the descriptions below, one for external respiration and one for internal respiration, and as you do, drag the numbers on each slide to their correct location on the illustration. External respiration During external respiration, the small amount of carbon dioxide transported in the plasma (1) quickly diffuses out of the blood down its pressure gradient. A small amount of oxygen (2) dissolves in the plasma. However, a majority of…