Releasing to the exterior of substances originating within the cell is referred to as ____________________
Fill in the blank(s) with correct word
exocytosis
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This figure illustrates the microscopic anatomy of spongy bone. What type of cell does number 3 indicate?
A. Osteocyte B. Osteoblast C. Osteoprogenitor cell D. Bone-lining cell E. Osteoclast
Which of the following is not true concerning the control of calcium metabolism?
a. PTH (parathyroid hormone) causes an increase in plasma calcium by activation of osteoclasts. b. PTH increases renal reabsorption of calcium. c. vitamin D causes an increase in secretion of Ca2+ into the lumen of the digestive tract. d. calcitonin causes a decrease in plasma calcium by decreasing Ca2+ movement from the bone fluid into the plasma and by suppressing bone resorption. e. when plasma calcium increases, PTH decreases and calcitonin increases.
Harry suffers from cystic fibrosis and has severe breathing difficulties. His problems result from
A) inability of the respiratory defense mechanism to transport mucus. B) uncontrollable laryngospasms. C) production of thick secretions that are difficult to transport. D) both the inability of the respiratory defense mechanism to transport mucus and the production of thick secretions that are difficult to transport. E) All of the answers are correct.
Fibrocartilage is found in intervertebral discs.
Answer the following statement true (T) or false (F)