Oxytocin is secreted by the posterior pituitary in females only
Indicate whether the statement is true or false.
ANSWER: False - both males and females
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Which of the following makes up most of an old tree trunk?
A) Secondary phloem B) Primary phloem C) Vascular cambium D) Primary xylem E) Secondary xylem
Carbon and hydrogen have similar electronegativities and combine together to form hydrocarbon molecules. What type of bonds form between these atoms?
A. electrostatic B. hydrogen C. nonpolar covalent D. ionic E. polar covalent
The two fatty acid tails are _________________ , but the phosphate group and its attachments form _____________ head, when reacting with water.
Fill in the blank(s) with the appropriate word(s).
Where does heart excitation originate?
a. atrioventricular node b. intercalated disk c. sinoatrial node d. pericardium e. all cardiac muscle fibers simultaneously