During the absolute refractory period, the cell
A. generates many local potentials.
B. is insensitive to further stimulation.
C. responds to even weak stimuli.
D. reverses the direction of the action potential.
E. is very sensitive.
B
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Compare the use of inferences about the ecology, behavior, and physiology of extinct animals based on extant phylogenetic brackets with those based on analogies with living forms—for example, the inferences in this chapter about the social
behaviors of ceratopsian dinosaurs that were based on analogies with modern herbivorous mammals with horns or antlers. How might you test your conclusions in each case?
Answer the following statements true (T) or false (F)
1. All lymphatic organs are composed of epithelial tissue. 2. The most important role of the spleen is to provide a site for lymphocyte proliferation and immune surveillance and response. 3. The simplest lymphoid organs are the lymph nodes. 4. Ventilation perfusion coupling means that more blood flows past functional alveoli than past nonfunctional alveoli. 5. The olfactory mucosal lining of the nasal cavity contains the receptors for the sense of smell.
Exophthalmos is a sign of hypersecretion of this hormone.
A. Parathormone B. Calcitonin C. GH D. Thyroxine
Which type of T cell is affected by HIV?
A. T Helper cells B. T Memory cells C. T Regulatory cells D. T Cytotoxic cells