The reaction in which water and carbon dioxide combine to form carbonic acid is
A. irreversible, as carbonic acid rapidly causes a drop in pH.
B. reversible, and can proceed in either direction depending on the concentrations of the molecules.
C. exergonic, and is an important energy source within the body.
D. an exchange reaction in which protons are transferred between atoms.
E. a catabolic reaction in which the formation of a larger molecule can lead to an increase in cell size.
B
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Bilirubin enters the liver having originated in the spleen.
Answer the following statement true (T) or false (F)
Select the best description of the negative selection process of lymphocyte maturation
A) removal of lymphocytes that fail to recognize "self" cells B) teaching a lymphocyte to recognize "self" from foreign antigens C) removal of lymphocytes that react with "self" cells D) allowing the survival of lymphocytes that cannot bind to MHC proteins
Somatic reflexes involve ______________________________________ muscles
Fill in the blank(s) with correct word
What connective tissue sheath wraps the axon of a neuron?
A) epineurium B) fascicle C) perineurium D) endoneurium