Parathyroid hormone release depends on blood levels of calcium. Such an endocrine reflex is said to be initiated by
A. hormonal stimulation.
B. humoral stimulation.
C. neural stimulation.
D. positive feedback stimulation.
B
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Sixty-five percent of the mass of bone is a compound called hydroxyapatite
Indicate whether the statement is true or false
Answer the following statements true (T) or false (F)
1. Including the ATP from glycolysis, the cell gains 34 ATP molecules from aerobic metabolism of one glucose molecule. 2. The body requires adequate supplies of only three minerals (calcium, sodium, chloride) and trace amounts of all others. 3. Processes that break down complex molecules into simpler ones are anabolic. 4. For use as fuel, all food carbohydrates are eventually transformed to glucose. 5. Triglycerides and cholesterol do not circulate freely in the bloodstream.
Vesicular breathing sounds probably result from ________
A) air filling the alveolar sacs B) air rushing through the large respiratory passageways C) air moving through the bronchioles
Streptomycin is an antibiotic that binds to bacterial ribosomes. Which cellular process will this drug prevent, thus causing the death of the bacteria?
A) Cellular respiration B) Protein synthesis C) DNA replication D) Cellular transport