Alex has just given blood at the Red Cross blood drive, and immediately after the event, his
blood pressure is a little lower than normal. How might his body respond to this?
a. Arteries can constrict to increase blood pressure.
b. His body is able to immediately manufacture new blood cells.
c. All the lost blood cells are replaced with water.
d. Veins can dilate to reduce blood flow.
A
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How can epidemiologist differentiate between common-source and host-to-host epidemics based only on the incidence of disease?
What will be an ideal response?
Meerkats are small desert mammals that live in groups of 20–50 animals. You observe a female meerkat who spends all of her time caring for the 1-year-old offspring of her sister (her nieces and nephews)
The aunt is capable of reproduction but has not reproduced. Which of the following would contribute to the evolution of this behavior pattern? A. The odds of any one female reproducing are completely random. B. Offspring require the efforts of a single adult (the mother) in order to be successful. C. Offspring require the efforts of at least two adults in order to be successful. D. Offspring are independent at the age of three months, with no adult care after that point.
Which of the following stimuli will NOT activate a nociceptor?
A. extremes in temperature B. very intense mechanical stimulation C. specific chemicals in the extracellular fluid D. chemicals released by injured cells E. external odorant molecules
Define and clearly differentiate between the following terms: cell determination and cell
differentiation. What will be an ideal response?