All of the following are true of neural reflexes except that they
A) are automatic motor responses.
B) are the simplest form of behavior.
C) help preserve homeostasis.
D) usually cannot be suppressed by the brain.
E) involve at least two neurons.
Answer: D
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About how many cells constitute the body of an adult?
A. 50 to 100 quadrillion B. 50 to 100 billion C. 50 to 100 million D. 50 to 100 trillion
Volumes expressed as ounces, pints, quarts, gallons, pecks, bushels, or cubic feet are examples of the ________.
A. metric system B. English system C. scientific notation D. International System
How does the integumentary system contribute to osteoporosis?
A. Lack of exposure to sunlight increases calcitonin secretion leading to reduced calcium storage in the bones. B. Decreased estrogen levels following menopause contribute to the disease. C. Lack of exposure to sunlight reduces vitamin D production and decreases calcium absorption. D. Estrogen produced in the dermis reduces calcium excretion in the kidneys. E. Calcium ions released from the bones are excreted through sweat.
Answer the following questions true (T) or false (F)
1. The predominant ingredient of the inorganic matrix of bone is calcium salts, with the majority existing as large molecules of hydroxyapatite crystals. 2. Spongy bone resists forces from many directions and forms a protective framework for the red bone marrow. 3. The process of ossification begins at a primary ossification center in both intramembranous and endochondral ossification.