Select the statement that best describes an acid
A) An acid is a chemical that dissociates to release equal amounts of hydrogen ions (H+) and hydroxide ions (OH-).
B) An acid is a substance that generally has covalent bonds that do not dissociate into charged particles in water.
C) An acid is a chemical that dissociates in water to release a hydrogen ion (H+).
D) An acid is a chemical that accepts a hydrogen ion (H+) in a solution.
Answer: C
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A) sodium. B) potassium. C) calcium. D) chloride. E) magnesium.
A person working outside in the hot sun can perspire a great deal. This increase in perspiration results in an increase in water loss from the body. Increased water loss causes the blood osmolality to increase. This increased osmolality is "sensed" by the ________.
A. kidneys B. cerebral cortex C. osmoreceptors D. anterior pituitary E. baroreceptors
Which of the following muscle groups contract during forced expiration?
a. external intercostals b. sternocleidomastoid c. rectus abdominus d. diaphragm
A cleft palate results from incomplete development of the
A. mandible. B. maxillae. C. vomer bone. D. ethmoid bone