Why must a person floating on the surface of the water and breathing through a snorkel increase his/her tidal volume and/or breathing frequency if alveolar ventilation is to remain normal? answer briefly

What causes wheeze in a patient suffering from an acute exacerbation of asthma? Question 19 options: Alveolar air trapping due to collapse of distal airways Presence of mucus plugs that occlude proximal bronchioles High velocity air travelling through narrowed airways Inadequate oxygenation of the blood and associated hypoxemia

During inhalation:     The diaphragm contracts and the external intercostals contract making the volume of the thoracic cavity larger.     The diaphragm and the external intercostals relax making the volume of the thoracic cavity larger     The diaphragm relaxes and the external intercostals contract making the volume of the thoracic cavity smaller     The diaphragm relaxes and the internal intercostals contract making the volume of the thoracic cavity smaller

The table below shows the activity of the diaphragm and associated changes. Complete the table to identify the changes that would be occurring relative to the diaphragm’s activity.  Action of diaphragm: Movement of diaphragm? Volume of thoracic cavity? Size of lungs? Direction of airflow? Contracted  inferiorly or superiorly?                                    increases or decreases?                                  increases or decreases?                                out of lungs or into lungs ?      Relaxed  inferiorly or superiorly?    increases or decreases?                                    increases or decreases?      out of lungs or into lungs ?    choose the answers

Which of the following can be included as part of internal respiration? 1. Gas exchange from the alveoli to the capillaries  2. Gas diffusion from alveoli to the red blood cells 3. Cells taking up oxygen to be used for cellular respiration

Atmospheric pressure is less than Sam's alveolar pressure. Which of the following is TRUE? Sam's intrapleural pressure is decreasing. Sam's diaphragm is relaxed. Sam is inhaling.

Air flow into and out of a blind cavity is which type of ventilation? Group of answer choices Unidirectional Flow Tidal Flow Concurrent Flow Cross Current Flow

A pilot is flying a commercial, pressurized (760mmHg) airplane at 30,000 feet. If the pilot’s body temperature is normal and the alveolar PO2 is 100 mmHg, which of the following is true? Atrieal PCO2 is 40 mmHgAlveolar PCO2 will be 100 mmHgThe pilot will be polycythemicAlveolar ventilation will be increasedAterial pH will be 7.6

Under conditions where normal breathing isn’t sufficient, other muscles will assist the diaphragm in changing the volume of the thoracic cavity. A muscle that increases the volume of the thoracic cavity will cause pressure to (↑/↓) which means that it is helping with forced (inspiration/expiration). A muscle that decreases the volume of the thoracic cavity will cause pressure to (↑/↓) which means that it is helping with forced (inspiration/expiration).

As a result of secreting surfactant into the alveolar space, surface tension of water. cells the Type Il alveolar, increase Type I alveolar, reduce Type Il alveolar, reduce O Type I alveolar, increase Red blood, decrease