A chemical reaction involves interactions between the _____ of two different atoms
a) neutrons
b) protons
c) isotopes
d) valence electrons
e) ions
Answer: d
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Wrinkles in the skin can be caused by
A) collagen disorders. B) increasing age. C) changes in levels of hormones. D) the cumulative effects of ultraviolet radiation. E) All of the answers are correct.
Which of the following statements concerning the descending pathways of the spinal cord is true?
A. Many of the descending pathways decussate in the midbrain. B. These pathways start in the spinal cord and end in the brain. C. Descending pathways consist of upper and lower motor neurons. D. Descending pathways must synapse in the thalamus. E. Most descending pathways control sensory functions.
The celiac ganglia do not innervate the
A) liver. B) spleen. C) stomach. D) pancreas. E) intestines.
Normally, the partial pressure of oxygen gas is higher in the ________.
A. bronchioles B. blood of the pulmonary capillaries C. alveoli D. venous blood