How is the beginning of intramembraneous ossification different from endochondral ossification?
What will be an ideal response?
Intramembraneous ossification starts in connective tissue from mesenchymal cells that become osteoblasts. These osteoblasts cluster together into an ossification center. Endochondral ossification starts with a hyaline cartilage "template." Mesenchymal cells become osteoblasts and begin forming bone around the cartilage.
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Which of these have the most advanced nervous system?
A) sea anemones B) jellyfish C) flatworms D) segmented worms
Which is true regarding pyrogens?
A) They can reset the temperature-regulating center in the hypothalamus and raise the body temperature. B) They break down tissue by autolysis, releasing digestive enzymes that first destroy the injured cells and then attack surrounding tissues. C) They act only within one tissue. D) They are particularly sensitive to chemicals released by other body cells or by pathogens. E) They make capillaries more permeable and speed up blood flow through the area within the damaged tissue.
Classify a vertebra with the following characteristics:(1) Superior articular processes face posteriorly(2) Circular vertebral foramen(3) Long spinous processes
A. Coccygeal B. Thoracic C. Sacral D. Lumbar E. Cervical
In terms of blood flow, why is it important that atrial diastole occurs just as ventricular systole begins?
A. Blood is continually propelled in a forward motion down its pressure gradient. B. The atria need that time to prepare for the next contraction. C. Ventricular systole pulls the remaining 20% of blood volume from the atria. D. Blood would flow too fast otherwise.