Human Physiology Lecture: Endochondral Ossification and Skeletal System
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Questions and Answers

Which hormone is responsible for lowering blood Ca levels by inhibiting osteoclast activity?

  • Insulin
  • Calcitriol
  • Calcitonin (correct)
  • Parathyroid hormone (PTH)
  • What type of fracture involves an exposed bone and intact skin?

  • Open (correct)
  • Segmental
  • Greenstick
  • Comminuted
  • During the inflammatory stage of bone healing, what is formed at the fracture site?

  • Hematoma (correct)
  • Cartilage
  • Callus
  • New blood vessels
  • Which type of fracture is characterized by a twisting injury?

    <p>Spiral</p> Signup and view all the answers

    What is the critical physiological regulator of many processes including muscle contraction?

    <p>Calcium</p> Signup and view all the answers

    Which stage of bone healing involves the formation of a callus and new blood vessels?

    <p>Reparative stage</p> Signup and view all the answers

    What is the function of osteoclasts in bone physiology?

    <p>Reabsorption of bone</p> Signup and view all the answers

    Which cells are responsible for depositing new bone material during bone remodeling?

    <p>Osteoblasts</p> Signup and view all the answers

    What is the process that involves the formation of bone within mesenchyme?

    <p>Intramembranous ossification</p> Signup and view all the answers

    What hormone is secreted from C cells in the thyroid gland for calcium ion regulation?

    <p>Calcitonin</p> Signup and view all the answers

    What is the main function of calcitonin in bone physiology?

    <p>Inhibiting bone breakdown</p> Signup and view all the answers

    Which cells are responsible for converting woven bone into lamellar bone during bone remodeling?

    <p>Osteoblasts</p> Signup and view all the answers

    What is the key signal for the secretion of PTH?

    <p>Reduction of blood Ca levels</p> Signup and view all the answers

    How does Calcitriol assist PTH in the kidney tubules?

    <p>By preventing Ca removal through urine</p> Signup and view all the answers

    What is the main function of PTH in relation to bone reabsorption?

    <p>Increase osteoclast activity</p> Signup and view all the answers

    Which organ is primarily responsible for Calcitriol activation?

    <p>Kidney</p> Signup and view all the answers

    What happens to cartilaginous tissue to maintain blood Ca levels within homeostatic limits?

    <p>It becomes ossified and rebuilt</p> Signup and view all the answers

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