Physiology 1021 Study Guide - Midterm Guide: Breathing, Peripheral Chemoreceptors, Central Chemoreceptors

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Which of the following statements concerning the transportation of gases is correct?
(A) Most of the oxygen in the blood is carried dissolved in plasma
(B) Most of the carbon dioxide carried in the blood is dissolved in plasma
(C) Hemoglobin can carry oxygen or carbon dioxide
(D) There is more oxygen dissolved in plasma than carbon dioxide
(E) Most of the carbon dioxide is carried attached to carbonic acid
If you were to increase the dead space volume of a subject by having them breathe through a
tube while they maintained their tidal volume and respiratory rate constant, which of the
following would occur?
(A) Pulmonary ventilation would increase
(B) Alveolar ventilation would decrease
(C) Pulmonary ventilation would decrease
(D) Alveolar ventilation would increase
(E) Alveolar and pulmonary ventilation would decrease
High PO2 levels in the blood with cause which of the following?
1. A right shift in the oxy-hemoglobin dissociation curve
2. It will cause more oxygen to bind to hemoglobin (Hb)
3. Decrease in activity of the central chemoreceptors
4. Decreased activity of the peripheral chemoreceptors
Which one of the following statements is INCORRECT?
(A) Oxygen is transported in the blood mainly bound to hemoglobin
(B) The CO2 content of the systemic arterial blood is lower than in venous
blood
(C) Oxygen delivery in the peripheral tissue occurs due to the low PO2 in the
tissue resulting in oxygen unloading from the hemoglobin
(D) There is more oxygen dissolved in plasma than carbon dioxide
(E) The amount of oxygen bound to hemoglobin decreases as body
temperature increases
Which one of the following is not biologically active
(A) antidiuretic hormone (vasopressin)
(B) atrial natiuretic factor
(C) angiotensin II
(D) aldosterone
(E) angiotensinogen
Premature babies are often born without sufficient pulmonary surfactant. Which of the
following will be seen in such a premature baby?
(A) They have lungs that are easy to inflate but difficult to deflate
(B) They will have abnormally high surface tension in the lungs compared to normal
(C) There will be an increase in lung compliance compared to normal
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