_____ are the main male hormones.
Fill in the blank(s) with the appropriate word(s).
Answer: Androgens
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Pertussis has been making a big comeback in the last few years, after being on the decline for quite a long time. Why is this?
A. The pertussis vaccine does not seem to protect for a lifetime, so those who received the vaccine as kids may become susceptible in adulthood. B. The strain of Bordetella pertussis that is now the major cause of pertussis is much more virulent than earlier strains. C. People eat so much refined sugars and starches that our immune systems are much weaker, thereby not being able to adequately protect against pertussis bacteria. D. Few people have ever received pertussis vaccines because there have been links to autism.
Diffusion of morphogens influence the differential expression of other genes such as __________, which govern the
formation of specific body parts. Fill in the blank(s) with the appropriate word(s).
The exposed, unmyelinated gaps between glia on myelinated axons are also sites of voltage-gated Na+ channels.
Answer the following statement true (T) or false (F)
Which of the following is (are) found in many veins that help direct blood flow in one direction only: toward the heart?
A) valves B) lymph nodes C) myocardium D) pericardium