Textbook pedagogy: Improving chapter summaries encourages collaborative learning
- Microvilli are short surface extensions of the plasma membrane that increase a cell’s surface area. They are especially well developed on absorptive cells, as in the kidney and small intestine. On some cells, they play a sensory role.
- Parathyroid hormone is secreted by the parathyroid glands in response to hypocalcemia. It raises blood Ca2+ levels by indirectly stimulating osteoclasts, inhibiting osteoblasts, promoting calcitriol synthesis, and promoting Ca2+ conservation by the kidneys.
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