According to the oxygen-hemoglobin dissociation curve, PO2 in the lungs of 100 mm Hg results in Hb being 98% saturated. At high altitude, there is less O2. At a PO2 in the lungs of 80 mm Hg, Hb would be ________ saturated
A) 98%
B) less than 50%
C) 100%
D) 95%
D
Anatomy & Physiology
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Breathing rate increases during exercise due to
A) a joint reflex. B) stimulation of the respiratory areas by decreasing blood concentration of oxygen and increasing blood concentration of carbon dioxide. C) all of the above. D) signals from the cerebral cortex to the respiratory areas when it also signals skeletal muscles to contract.
Anatomy & Physiology
Homeostasis is when the body is static or unchanging.
a. true b. false
Anatomy & Physiology
Nitroglycerine causes vasodilation of blood vessels due to its effects on levels of ________.
A. prostacyclin B. nitric oxide C. bradykinin D. histamine
Anatomy & Physiology
Complications related to arteriosclerosis account for roughly ________ percent of deaths in the United States
A) 30 B) 60 C) 20 D) 50 E) 25
Anatomy & Physiology