Why is it more difficult to obtain sufficient oxygen at higher altitudes? What will be an ideal response?
Concepts to Consider: Barometric pressure decreases at higher altitudes. The concentration of
oxygen in air is 21%, so the partial pressure of oxygen decreases along with barometric pressure.
Recall, oxygen flows from high pressure to low. At an altitude of 10,000 m, the partial pressure of
oxygen is 50 mm Hg, and arterial oxygen saturation is only 20% (normal partial pressure of oxygen in
blood is 100 mm Hg and 40 mm Hg in the tissues
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What key words does the question contain and what do they mean?
What will be an ideal response?
Which of the following groups consists primarily of anaerobic organisms that cause disease?
a. Excavates b. Dinoflagellates c. Archaeplastida d. Diatoms e. Ciliates
When Ca2
+ diffuses into the cytoplasm of muscle cells and initiates the crossbridge cycle, the animal is most likely stressed.
Indicate whether the statement is true or false.Sensory neurons release glutamate and neuropeptides such as __________ to enhance the effect of
glutamate. a. GABA b. substance P c. serotonin d. norepinephrine e. adrenalin