CH. 45 Questions Flashcards
The greatest difference in the concentration of respiratory gases is found in which of the following
pairs of mammalian blood vessels?
A) the inferior vena cava and the superior vena cava
B) the veins from the right and left legs
C) the pulmonary vein and the jugular vein
D) the pulmonary artery and the inferior vena cava
E) the pulmonary vein and the aorta
C) the pulmonary vein and the jugular vein
The air pressure in Denver, Colorado, is about 83% of the air pressure in Miami Beach, which is at
about sea level. Given that the air pressure in Miami Beach is 760 mm Hg and oxygen makes up 21% of
the air in Miami Beach, what are the percentage of oxygen and the partial pressure of oxygen in Denver, respectively?
A) 17.4%; 21 mm Hg
B) 21%; 132 mm Hg
C) 21%; 21 mm Hg
D) 17.4%; 132 mm Hg
B) 21%; 132 mm Hg
Breathing is primarily regulated by _____.
A) hemoglobin levels in the blood B) carbon dioxide concentration and pH-level sensors C) erythropoietin levels in the blood D) the lungs and the larynx E) the concentration of red blood cells
B) carbon dioxide concentration and pH-level sensors
The Bohr shift on the oxygen-hemoglobin dissociation curve is produced by changes in _____.
A) the partial pressure of carbon monoxide B) pH C) temperature D) the partial pressure of oxygen E) hemoglobin concentration
B) pH
Based on the figure above, showing fetal (A) and adult (B) oxygen-hemoglobin saturation curves, which of the following conclusions is true?
A) Adult saturation occurs at lower partial pressures of oxygen than fetal saturation does.
B) As the partial pressure of oxygen increases, adult hemoglobin approaches saturation faster than fetal hemoglobin does.
C) At 50 percent saturation, fetal blood will have a higher affinity for oxygen than adult blood will.
D) The mother binds oxygen with greater affinity than the fetus.
C) At 50 percent saturation, fetal blood will have a higher affinity for oxygen than adult blood will.
Blood returning to the mammalian heart in a pulmonary vein drains first into the _____.
A) left atrium B) right ventricle C) right atrium D) vena cava E) left ventricle
A) left atrium
In mammals, most gas exchange between the atmosphere and the pulmonary blood occurs in the_____.
A) trachea B) alveoli C) bronchi D) bronchioles E) larynx
B) alveoli
If a molecule of carbon dioxide released into the blood in your left toe is exhaled from your nose, it
must pass through all of the following EXCEPT _____.
A) the trachea B) an alveolus C) the right ventricle D) the pulmonary vein E) the right atrium
D) the pulmonary vein
What type of blood vessels has the slowest velocity of blood flow?
A) veins
B) arterioles
C) capillaries
D) arteries
C) capillaries
Which of the following develops the greatest pressure on the blood in the mammalian aorta?
A) diastole of the right atrium B) diastole of the right ventricle C) systole of the left ventricle D) diastole of the left atrium E) systole of the left atrium
C) systole of the left ventricle
Site where exchanges of food and gases are made?
A) veins
B) arterioles
C) capillaries
D) arteries
C) capillaries
Site where blood pressure is lowest.
A) veins
B) arterioles
C) capillaries
D) arteries
A) veins
Site where the velocity of blood flow is fastest.
A) veins
B) arterioles
C) capillaries
D) arteries
D) arteries
Site where resistance to blood flows is greatest.
A) veins
B) arterioles
C) capillaries
D) arteries
B) arterioles
Site where the velocity of blood flow is slowest.
A) veins
B) arterioles
C) capillaries
D) arteries
C) capillaries
