Which of the following is normally the major source of hydrogen ions in the body?
a. Phosphoric and sulfuric acids formed during the metabolism of dietary proteins
b. Lactic acid production by the muscles during exercise
c. Carbonic acid generated from metabolically produced CO2
d. Natural acids found in foods, such as citric acid
e. Fatty acids produced during fat metabolism
C
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Which of the following is NOT true of corticospinal fibers?
A. They may synapse with afferent neurons in ascending pathways. B. They may synapse directly on gamma motor neurons. C. They may synapse directly on interneurons. D. They are collectively sometimes called the extrapyramidal system. E. They may synapse directly on alpha motor neurons.
If two vectors lying in the same plane are added together and the result is zero, then which of the following is true of the vector quantities?
A. they are equal in magnitude B. they are opposite in direction C. both A and B D. none of the above
The DCT secretes hydrogen ions in exchange for sodium ions by the process of
A) diffusion. B) facilitated diffusion. C) osmosis. D) cotransport. E) energy-dependent exchange pump.
Which of the following is a type of white blood cell that plays a key role in adaptive immunity by seeking out, attacking, and destroying targeted pathogens?
A) B-Cells B) Goblet Cells C) Antibodies D) T-Cells