A normal heart is fully repolarized at -60mV. Using the diagram, describe what has occurred in this heart.
Ans: The heart rate has decreased as the heart experiences greater hyperpolarization and slower depolarization.
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Which of the following statements about nervous and endocrine signaling is false?
A. The nervous system and endocrine system are both regulatory systems, but the two systems do not communicate directly with one another. B. Endocrine signaling is generally more prolonged than nerve cell signaling. C. The nervous system transmits signals between adjacent cells using neurotransmitters, whereas the endocrine system signals with hormones. D. Neurotransmitters function only over short distances, whereas hormones can affect cells throughout the body. E. Nerve cell signaling is generally more rapid than endocrine signaling.
What level of biodiversity are these scientists MOST concerned with?
The Florida panther, Puma concolorcoryi, is one of the most threatened species on Earth, with only 80-100 individuals remaining. Their population is most threatened by humans, habitat loss, and their own poor health due to genetic diseases. Some conservationists want to introduce new individuals from Texas, the mountain lion, Pumaconcolor. Scientists are currently uncertain whether the Florida panther and the Texas mountain lion are the same or different subspecies. A. Genetic diversity B. Population diversity C. Species diversity D. Local diversity E. Ecosystem diversity
Which of the following processes does NOT serve to
maintain low pressure at the receiving end of sieve tube pipelines? a. sucrose conversion into cell-wall polysaccharides b. sucrose conversion into starch in the receiving regions c. sucrose conversion to glucose, which is then used in cellular respiration d. activity of companion cells e. conversion of sucrose to fructose in fruits
In which cells would you expect to find the highest level of telomerase?
A. adipose tissue cells B. muscle cells C. cells that replenish the lining of the gut D. neurons