To help catalyze reactions, certain vitamins act as ________ in some chemical reactions.
A. coenzymes
B. energy sources
C. steroids
D. substrates
Answer: A
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A bone fracture in your arm would be part of the ________ division of the skeleton.
A. thoracic B. appendicular C. axial D. spinal
Which is not correct regarding saliva?
A. Daily production is 1?1½ liters. B. It contains antibodies and an antibacterial enzyme. C. Its pH is slightly alkaline. D. The majority of its volume is water. E. It contains mucus to aid in swallowing.
Collectively, the renal and respiratory systems comprise the chemical buffering system of the body.
Answer the following statement true (T) or false (F)
All of the following statements are true of most lymph tissues except:
A. they house lymphocytes and macrophages. B. they are largely composed of reticular connective tissue. C. they are the site of lymphocyte proliferation. D. the B lymphocytes are able to secrete antigens into the blood.