In humans, the lungs inflate during respiration when the
A. rib muscles contract.
B. diaphragm muscle expands.
C. rib muscles and diaphragm muscle contract.
D. diaphragm relaxes.
E. rib muscles and diaphragm relax.
Answer: C. rib muscles and diaphragm muscle contract.
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Answer the following statements true (T) or false (F)
1. Osteoblasts are the bone-resorbing cells. 2. Most of the bones of the body begin as cartilage. 3. As long as the epiphyseal plate remains between the diaphysis and epiphysis, bone growth can continue. 4. The “soft spots” in a baby’s skull are referred to as fontanels. 5. Osteoporosis is a weakening of the bone and occurs most often in women of childbearing age.
The redness and heat of an inflamed area are due to a local hyperemia caused by ________.
A) vasodilation B) vasoconstriction C) phagocyte mobilization D) production of complement and interferon
A double covalent bond is formed when atoms
A) swap two pairs of electrons. B) share two pairs of electrons (a total of four). C) transfer a pair of electrons from one atom to the other. D) share one pair of electrons (a total of two). E) transfer two pairs of electrons from one atom to the other.
The midline region of the mandible is called the
A) symphysis. B) thyroid cartilage. C) external occipital protuberance D) body of the mandible. E) mental protuberance.