One of the functional characteristics of life is irritability. This refers to ________.
A) indigestible food residues stimulating the excretory system
B) sensing changes in the environment and then reacting or responding to them
C) the nervous system causing all living things to sometimes experience anger
D) the necessity for all organisms to reproduce
B) sensing changes in the environment and then reacting or responding to them
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The partial pressure of carbon dioxide in venous blood is approximately
A) 40 mm Hg. B) 45 mm Hg. C) 50 mm Hg. D) 70 mm Hg. E) 100 mm Hg.
Villi
A. are found throughout the gastrointestinal tract. B. generate movement of materials in the large intestine. C. increase surface area in the small intestine. D. contain both smooth and skeletal muscle fibers. E. All of the choices are correct.
The groove between the frontal and parietal lobes of the brain is (the)
A) lateral sulcus. B) central sulcus. C) longitudinal fissure. D) parieto-occipital sulcus. E) None of the answers are correct.
The white rami communicantes ________
A) are found only in the C1-T1 segments B) carry preganglionic axons to the sympathetic chain C) are unmyelinated D) carry postganglionic fibers to the periphery