Lymphocytes known as ________ differentiate into plasmocytes, which secrete antibodies that attack foreign cells or proteins in distant portions of the body.
Fill in the blank(s) with the appropriate word(s).
B cells
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Nerve and muscle are considered ____________________ tissues because they produce electrical signals when excited
Fill in the blank(s) with correct word
Specific arrangements of atoms within an organic molecule that confer characteristic chemical properties upon that molecule are called
a) hydrocarbon chains. b) polymers. c) carbon skeleton. d) functional groups. e) isomers.
By the second month of development, within the umbilical cord there are ________ umbilical vein(s) and ________ umbilical artery(ies).
A. two; one B. one; two C. one; one D. two; two E. two; three
Electrical synapses use neurotransmitters to send information to other cells.
Answer the following statement true (T) or false (F)