When you are taking your pulse, what physical event related to the cardiac cycle are you feeling?
What will be an ideal response?
The bulging of an artery with each ventricular contraction is the pulse. Arteries have an outer covering of highly elastic connective tissue and with each ventricular contraction, blood is forced into the arteries making the arterial wall expand or bulge. Then, as the ventricle relaxes, the artery wall springs back like a rubber band that has been stretched. Therefore, one pulse equals one heartbeat.
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Which group of gymnosperms has only a single living representative species?
A. cycads B. ginko C. conifers D. gnetophytes E. lycopodium
________ efficiency is the ratio of production to assimilation, which measures how efficiently the consumer incorporates assimilated energy into secondary production
Fill in the blank(s) with correct word
Eukaryotic chromosomes consist of
A) DNA alone. B) DNA complexed with protein. C) DNA complexed with RNA. D) DNA complexed with fatty acids. E) DNA complexed with protein and RNA.
Which of the following statements is CORRECT?
a) the scientific method can be used only to understand scientific phenomena b) common sense is usually a good substitute for the scientific method when trying to understand the world c) a hypothesis that does not generate a testable prediction is not useful d) it is not necessary to make observations as part of the scientific method