Besides sterilization, the only sure way to avoid pregnancy is ________.
Fill in the blank(s) with the appropriate word(s).
abstinence
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The valve situated where the coronary sinus enters the right atrium is the
A. pulmonic semilunar. B. tricuspid. C. aortic semilunar. D. mitral. E. thebesian.
The role(s) of the sinuses include(s)
A) making the skull lighter. B) production of mucus that moistens and cleans the air. C) increasing surface area for gas exchange. D) extra source of air and increasing surface area for gas exchange. E) making the skull lighter and production of mucus that moistens and cleans the air.
The four elements that make up about 96% of body weight are ________
A) carbon, oxygen, hydrogen, nitrogen B) carbon, oxygen, phosphorus, calcium C) nitrogen, hydrogen, calcium, sodium D) sodium, potassium, hydrogen, oxygen
The limbic system, especially the _____ and _____ , are rich in "stress hormone" receptors
Fill in the blank(s) with the appropriate word(s).