Part 1 Heart And Lungs Flashcards
What changes occur with the onset of exercise
Increase rate of cellular respiration
What conditions are necessary for air to be exhaled from the lungs?
Air pressure in the alveoli must be greater than the air pressure in the mouth
Changes in the volume of the thoracic cavity is part of what?
Mechanics of ventilation
What happens during inhalation
Both the external intercostal muscles and the diaphragm contract
What is the concentration of oxygen and carbon dioxide in the lungs after gas exchange has occurred?
Oxygen is higher in the capillaries
Carbon dioxide is higher in the alveoli
Functions of the Conducting airways to treat air entering the lungs
Offers a low resistance pathway for air flow
Warms and moisten air
Mucus and colored cells filter air
Explain the changes in ventilation with exercise
Total volume stood at increases
Results in decrease in inspiratory reserve volume
The exhale cause the intercostal and abdominal muscles to act on the ribs to produce greater inhalation
Describe how carbon dioxide is carried by the blood
Dissolved directly in plasma
Bound to hemoglobin
As bicarbonate HCO3
Approximate percentage of oxygen in the blood transported by the hemoglobin
98%
Pulmonary ventilation
Exchange of air between the atmosphere and the lungs
Inhalation
Diaphragm contracts and lowers
External intercostal muscles contract and the internal relax
Chest cavity expands which increases volume and decreases internal air pressure
Exhalation
Diaphragm relaxed and moves up
Chest cavity volume decreased and internal air pressure increases
Total lung capacity
Maximum volume of lungs after maximum inhalation ( Vidal + residual)
Total volume
Volume inspired or expired per breath
Inspiratory reserve volume
Max inspiration at the end of tidal inspiration
