Chondroblasts ________
A) remain in compact bone even after the epiphyseal plate closes
B) within the cartilage divide and secrete new matrix
C) never lose their ability to divide
D) are mature cartilage cells located in spaces called lacunae
B
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Lymph transport involves all of the following EXCEPT ________
A) lymph capillary minivalve action B) milking action of active muscle fibers C) thorax pressure changes during breathing D) smooth muscle contraction in the lymph capillary walls
During the ____________________ stroke, cross bridges of myosin pull the actin filaments in the sarcomere
Fill in the blank(s) with correct word
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.
Rough endoplasmic reticulum (RER) in the cell cytoplasm is intensely stained by hematoxylin because hematoxylin:
a. Attaches to lipids in RER membranes b. Binds readily to RNA c. Catalyzes the precipitation of ribosomes into a dense, readily stained matrix d. Is an acid dye and binds to acidophilic ribosomal proteins e. Reacts with carbohydrate molecules of integral membrane proteins