Blood pressure depends on:
a. the height and weight of an individual.
b. atrial volume and stroke rate.
c. blood flow and resistance of blood against the vessel walls.
d. total blood volume.
e. heart rate.
c
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Which of the following is the major reason why it has been difficult to treat viral infections with chemotherapeutic agents?
A. Viruses use the metabolic machinery of their hosts, which limits many of the potential points of attack. B. Viruses have no metabolism and therefore offer no selective point of attack. C. Viral metabolism resembles that of their hosts so there is no selective point of attack. D. Actually, viruses are not difficult to treat with chemotherapeutic agents.
Four of the five events listed below are related to
pairing of chromosomes. Select the exception. a. pairing of homologues b. crossing over c. exchange of genes d. tight aligning of homologues e. segregation of chromosomes during anaphase I
IgE antibody, which is associated with allergic responses,
A) encourages mast cells and basophils to release chemicals such as histamine and leukotrienes. B) can be found bound to B cells. C) is resistant to destruction by stomach acid. D) is usually found circulating in the bloodstream. E) is passed from mother to child through breastfeeding and may prevent the development of allergies in the child.
The microbial symbionts of insects are inherited by
a. horizontal transmission. b. vertical transmission. c. heritable transmission. d. horizontal and vertical or heritable transmission.