Blood circulation from the lungs goes directly to the __________.
Answer(s): C
The pulmonary circulation returns oxygenated blood from the lungs through the pulmonary veins to the left atrium of the heart.
The glucose content of the blood is regulated by __________.
Answer(s): A
The relative concentration of glucose is maintained by the combined action of insulin from the pancreas and adrenaline from the adrenal medulla.
Erosion and depletion are problems associated with __________.
Soil is eroded by the action of wind, water, and ice and/or is depleted by the removal of organic matter or minerals.
The beneficial relationship between termites and the protozoa that inhabit their digestive systems is called __________.
Symbiosis is a nutritive relationship in which organisms of different species live together and benefit each other.
A viral infection in humans that has a very long time between the initial exposure and the exhibiting of symptoms is __________.
A person exposed to the AIDS virus will take up to 6 months to show antibodies in the blood serum and 2 to 5 years to show externally observable symptoms.
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