Human Anatomy (9th Edition)
9th Edition
ISBN: 9780134424873
Author: Martini
Publisher: PEARSON
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Chapter 5, Problem 2RC
Which of the following could cause premature closure of the epiphyseal cartilages?
(a) increased levels of sex hormones
(b) high levels of vitamin D3
(c) too little parathyroid hormone
(d) an excess of growth hormone
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Human Anatomy (9th Edition)
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- Growth hormone, or GH, is used medically to spur growth in children who are unusually short because they have a GH deficiency. However, it is useless for a short but otherwise normal 25-year-old to request GH treatment in order to grow taller. Why?arrow_forwardIf bleached human bones found lying in the desert were carefully examined, would osteons be present? How about osteocytes and a marrow cavity?arrow_forwardDescribe how bone first develops.arrow_forward
- During embryonic formation of connective tissue structures, does the chondroblasts mature to become osteoblasts.arrow_forwardWhat can a deficiency of growth hormone during bone formation cause? a.increased osteoclast activity b.decreased osteoclast activity c.decreased epiphyseal plate activity d.inadequate calcification of bonearrow_forwardWhat do you mean by calcified cartilages?arrow_forward
- What is the process by which bone forms?arrow_forwardAchondroplasia is a type of dwarfism in which the long bones stop growing during childhood, resulting in limbs that are disproportionately shorter than the torso. This genetic disorder is characterized by deficiencies in the epiphyseal plate that include a low number of chondrocytes and inability of chondrocytes to enlarge. Which zones do you think would be most affected by this disorder? and why?arrow_forwardAt his ninety-fourth birthday party, Jim was complimented on how good he looked and was asked about his health. He answered, “I feel good, except that some of my joints ache and are stiff, especially my knees and hips and lower back, and especially when I wake up in the morning.” A series of X-ray studies and an MRI scan taken a few weeks earlier showed that the articular cartilages of these joints were rough and flaking off and that bone spurs were present at the ends of some of Jim’s bones. What is Jim’s probable condition?arrow_forward
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