If vitamins do not provide a source of energy, what is their role in nutrition?
A) they serve as plasma membrane constituents
B) they are chemical messengers
C) they increase absorption of nutrients
D) they absorb excess toxins
E) they serve as coenzymes in metabolic pathways
Answer: E
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The reaction rates of many chemical reactions that occur in the body are controlled by special protein molecules called ________.
Fill in the blank(s) with the appropriate word(s).
The most common lever systems in the body are those that have the applied force between the fulcrum and the load. These are called ________ levers
A) first-class B) second-class C) third-class D) fourth-class E) fifth-class
What region of the nephron reabsorbs about two-thirds of filtered Na+ and Cl-?
A. ascending loop of Henle B. glomerulus C. proximal convoluted tubule D. distal convoluted tubule E. collecting duct
Which glands secrete their product into interstitial fluid or blood?
a) exocrine b) endocrine c) holocrine d) sudoriferous