Describe the stimulus for bone resorption and how resorption is carried out at the cellular and chemical levels.
What will be an ideal response?
When blood calcium is low, resorption is stimulated. Lysosymes of osteoclasts degrade osteoid by secreting digestive enzymes; hydrocholoric acid dissolves the inorganic matrix.
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Plasma is closest in composition to
A) urine. B) isotonic saline solution. C) sterile water. D) CSF. E) interstitial fluid.
How does the dorsal blood vessel of the earthworm pump blood?
A) Contractile skeletal muscle surrounding the vessel B) Peristalsis C) Contractile chamber D) It doesn't pump blood. Blood flow is passive.
To accommodate for their high surface to volume ratio, smaller mammals
a. reduce the size of each alveolus. b. increase alveolar density. c. increase the density of capillaries used in gas exchange. d. reduce the size of each alveolus and increase alveolar density. e. all of these.
The respiratory center gathers information from a variety of sources in order to set the rate and depth of breathing. This is an example of what type of neural circuit?
A) Parallel after-discharge B) Convergent C) Reverberating D) Divergent