Along with the nervous system, the ______ system coordinates the various activities of body parts.
A) digestive
B) endocrine
C) circulatory
D) respiratory
E) excretory
Ans: B) endocrine
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A model airplane is being flown at the end of a cord 20 feet long. If the speed of the airplane remains constant, but the cord is shortened to 15 feet, what will be the effect on the radial acceleration of the airplane?
A. it will increase B. it will decrease C. it will remain the same D. one must know the weight of the airplane in order to answer the question
Reversible enzymatic reactions are regulated by the ______ of molecules for each reaction
Fill in the blank(s) with the appropriate word(s).
Neurons of the ventrolateral preoptic nucleus (VLPO) of the hypothalamus release ________ that promotes sleep.
A. Acetylcholine B. Dopamine C. Histamine D. GABA
Polar molecules, like water, result when electrons are shared ________
A) unequally between atoms B) between ions C) equally between atoms D) or transferred between atoms