Which one of the following statements about aging is most accurate?
A) The brain reaches its maximum weight around the seventh decade of life.
B) Synaptic connections are too fixed to permit a great deal of learning after the age of 35.
C) Despite some neuronal loss, an unlimited number of neural pathways are available and ready to be developed; therefore, additional learning can occur throughout life.
D) Learning throughout the adult and aging years is supported primarily by glial proliferation.
E) Increased efficiency of the sympathetic nervous system enhances the ability to learn.
C
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The respiratory membrane consists of
A. two thicknesses of epithelial cells and basement membranes. B. a single thickness of epithelial cells. C. a single thickness of epithelial cells and a basement membrane. D. two thicknesses of epithelial cells.
Endocrine disorders resulting in too little hormone activity may stem from all of the following except
a. lack of target cell receptors b. hyposecretion c. reduced plasma protein binding d. increased removal from blood e. genetic mutations
A solution of a pH above 7 is called ________.
A. neutral B. isotonic C. acidic D. basic
Mucous secretions of the respiratory tract include antimicrobial substances such as lysozyme and defensins.
Answer the following statement true (T) or false (F)