mastering respiratory system

A hemoglobin molecule contains ________ globular protein subunits.

2 alpha and 2 beta

The partial pressure of oxygen (PO2) in pulmonary veins during internal respiration is approximately

95 mm Hg.

Low pH alters hemoglobin structure so that oxygen binds less strongly to hemoglobin at low PO2. This increases the effectiveness of

internal respiration.

When the diaphragm and external intercostal muscles contract

the volume of the thorax increases

Alveolar ventilation (VA) refers to the

amount of air reaching the alveoli each minute

If the fluid bond between the parietal and visceral pleura is broken and the lung collapses, the resulting condition is termed

atelectasis

Most of the carbon dioxide in the blood is transported as

bicarbonate ions

Most of the oxygen transported by the blood is

bound to hemoglobin

The respiratory center is housed in the ________ of the brain.

brain stem

The "C" in COPD stands for

chronic

The obstructive lung disease in which elastic fibers are lost, leading to collapse of alveoli and bronchioles, is called

emphysema

When there is no air movement, the relationship between the intrapulmonary and atmospheric pressure is that

equal

Air moves out of the lungs when the pressure inside the lungs is

greater than the pressure in the atmosphere

The condition of having low tissue oxygen levels is known as

hypoxia

in quiet breathing

inspiration involves muscular contractions and expiration is passive

Absorption of O2 from blood and release of CO2 from tissue cells is known as

internal respiration

Boyle's law states that gas volume is

inversely proportional to pressure

movement of air into and out of the lungs

movement of air into and out of the lungs

The condition resulting from inadequate production of surfactant and the resultant collapse of alveoli

respiratory distress syndrome

The unit of measurement for pressure specifically preferred by many respiratory therapists is

torr