The only kind of cell in the body that is not produced by the division of preexisting cells is
A) a gamete (sperm or egg cell).
B) a neuron (nerve cell).
C) an osteocyte (bone cell).
D) none, because every cell is produced by the division of another cell.
E) a liver cell.
D
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A red blood cell contains a large nucleus; it is thicker near the center and thin around the rim of the cell.
Answer the following statement true (T) or false (F)
What ion is sometimes used as a second messenger of amino acid-based hormones?
A) sodium B) calcium C) iron D) chlorine
Which is the action of histamine?
A) releases digestive enzymes that destroy the injured cells and then attacks the surrounding tissues B) increases rate of metabolism C) interferes with viral replication inside the cell D) makes capillaries more permeable and speeds up blood flow through the area of damaged tissue E) enhances phagocytosis
The part of the female reproductive cycle during which estrogen secretion reaches its highest level is:
a. menarche b. the secretory phase c. the proliferative phase d. menopause