In the bronchial tree, the lobar bronchi branch directly into
A. terminal bronchioles.
B. bronchioles.
C. segmental bronchi.
D. secondary bronchi.
E. primary bronchi.
Answer: C
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In emphysema,
the number of alveoli is reduced. cartilage rings in the trachea break down. the diaphragm is paralyzed. the epiglottis becomes less mobile.
The portion of the hair below the surface of the skin is the
A. medulla. B. shaft. C. cuticle. D. root. E. hair bulb.
Platelets
a. are small cell fragments derived from large megakaryocytes in the bone marrow b. lack nuclei c. contain high concentrations of actin and myosin, which enable them to contract d. have all of the above characteristics e. have only characteristics a and b
Answer the following statement(s) true (T) or false (F)
1. Most blood cells are produced in the red marrow of bones. 2. A vertebra is considered an irregular bone. 3. A radiograph (X-ray) of a child's hand will show epiphyseal lines. 4. The hemopoietic tissue in a bone is otherwise known as myeloid tissue. 5. Osteogenic cells are bone stem cells that differentiate into osteoblasts and osteoclasts.