Updated Bio 253 Exam 3 Hondros Complete
Questions and Answers 2024 FULLY SOLVED
The mechanism that produces pulmonary ventilation is one that establishes a gas pressure gradient
between the - ANSWER>>>atmosphere and the alveolar air. Correct
Pressure gradients are established by changes in the - ANSWER>>>thoracic cavity. Correct
_____ law states that the volume of a gas is inversely proportional to its pressure. - ANSWER>>>Boyle's
During inspiration, as the size of the thorax increases, the - ANSWER>>>intrapleural and alveolar
pressures decrease. Correct
The ability of the lungs and thorax to stretch is referred to as - ANSWER>>>compliance. Correct
An obstructive lung disorder that is characterized by recurring spasms of the smooth muscles in the wall
of the bronchial air passages is - ANSWER>>>asthma. Correct
During the respiratory cycle, intrapleural pressure is always less than alveolar pressure. This difference is
called - ANSWER>>>transpulmonary pressure. Correct
The sensors that provide feedback information to the medullary rhythmicity area are the -
ANSWER>>>central chemoreceptors and peripheral chemoreceptors. Correct
The apparatus used to measure the volume of air exchanged in breathing is called a(n) -
ANSWER>>>spirometer. Correct
The basic rhythm of the respiratory cycle of inspiration and expiration seems to be generated by the -
ANSWER>>>medullary rhythmicity area. Correct
Which term refers to the volume of inspired air that actually reaches, or "ventilates," the alveoli? -
ANSWER>>>alveolar ventilation Correct
The volume of air exhaled normally after a typical inspiration is called _____ volume. - ANSWER>>>tidal
Correct
Hyperpnea means a(n) - ANSWER>>>increase in breathing. Correct
The _____ represents the largest volume of air an individual can move in and out of the lungs. -
ANSWER>>>vital capacity Correct
The forced expiratory volume test can determine the presence of respiratory obstruction by measuring
the - ANSWER>>>volume of air expired per second during forced expiration. Correct
According to the law of partial pressures, the partial pressure of gas in a mixture of gases is -
ANSWER>>>directly related to the concentration of that gas in the mixture and to the total pressure of
the mixture. Correct
, Oxygen enters blood from alveolar air because the partial pressure of alveolar air is - ANSWER>>>greater
than the partial pressure of incoming blood. Correct
The amount of oxygen that diffuses into blood each minute depends on which factor? -
ANSWER>>>oxygen pressure gradient between alveolar air and incoming pulmonary blood
total functional surface area of the respiratory membrane
respiratory minute volume
alveolar ventilation
Which structural feature facilitates oxygen diffusion from the alveolar air into the blood in lung
capillaries? - ANSWER>>>The alveolar and capillary walls are both very thin.
The alveolar and capillary surfaces are both extremely large.
The lung capillaries accommodate a large amount of blood at one time.
Each red blood cell comes close to alveolar air.
The exact amount of oxygen in blood depends mainly on the amount of - ANSWER>>>hemoglobin
In what form does oxygen travel in the blood? - ANSWER>>>dissolved oxygen in the plasma
associated with hemoglobin
The compound formed when carbon dioxide combines with hemoglobin is -
ANSWER>>>carbaminohemoglobin. Correct
When carbon dioxide dissolves in water, some of the carbon dioxide molecules associate with water to
form - ANSWER>>>carbonic acid. Correct
The exit of the bicarbonate ion from the red blood cell is balanced by the inward transport of another
negative ion, chloride. This countertransport of negative ions is often called the _____ shift. -
ANSWER>>>chloride Correct
An increase in carbon dioxide in the blood causes - ANSWER>>>a drop in pH in the blood. Correct
A right shift of the oxygen-hemoglobin dissociation curve due to increased partial pressure of carbon
dioxide is also known as - ANSWER>>>the Bohr effect. Correct
Which oxygen-binding protein helps move oxygen out of the blood and into muscle cells? -
ANSWER>>>myoglobin Correct
What variations exist in the body to temporarily store or carry oxygen? - ANSWER>>>neuroglobin
myoglobin
fetal hemoglobin
More than two-thirds of the carbon dioxide carried by blood is carried in the form of -
ANSWER>>>bicarbonate ions. Correct
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