Which of the following statements concerning development of the integumentary system is true?
A. Sensory receptors in the skin are derived from the epidermis.
B. Collagen fibers do not appear until after birth.
C. The epidermis is derived from mesoderm.
D. The melanocytes are derived from ectoderm.
E. Nails, hair, and glands develop from the dermis.
Answer: D
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Why is the temporomandibular joint considered to be a second-class lever?
A. The force is in the middle. B. The resistance is in the middle. C. The fulcrum is in the middle. D. It has a mechanical advantage of 1.0 or less. E. The effort arm is longer than the resistance arm.
Low dietary intake of cholesterol triggers cholesterol synthesis within the liver to increase
Indicate whether this statement is true or false.
Which of the following is not a characteristic of capillaries?
a. thin walls b. short distance between adjacent vessels c. distensible walls d. slow blood velocity e. large total surface area
The center of the osteon is called the ________
A) central (Haversian) canal B) perforating (Volkmann's) canal C) canaliculus D) lacuna