What hormone increases the number and activity of osteoclasts, which decreases bone density and increases blood calcium?
What will be an ideal response?
Parathormone
You might also like to view...
When you draw back a bow and shoot an arrow, the arrow exhibits kinetic energy as it moves through the air. As you know, energy cannot be created or destroyed. Thus, trace the origin of the kinetic energy of the arrow as far back as you can
What will be an ideal response?
Which of the following is (are) correct in a predator-prey cycle?
A. A decline in the number of prey causes a decline in the number of predators. B. A decline in the number of predators causes a decline in the number of prey. C. An increase in the number of predators triggers an increase in the number of prey. D. All of these are correct, causing an up-and-down cycle for each animal.
Adult giraffes can be up to 20 ft. tall, and thus require special adaptations to maintain appropriate blood pressure. One adaptation is the rete mirabile, a group of blood vessels that form a web or net-like structure to slow blood flow.Although especially useful to the giraffe, the rete mirabile is similar to a countercurrent heat exchange system in other related, less evolved, mammals. Thus a mechanism for ________ homeostasis is likely to have evolved from a mechanism previously used for ________ homeostasis.
A. blood pressure; temperature B. blood pressure; pH C. temperature; blood pressure D. pH; blood pressure
Which of the following is considered a likely explanation for the events of the Cambrian explosion?
A) Complex predator-prey relationships and increased atmospheric oxygen levels promoted animal diversification. B) A great surge of volcanic activity was triggered by significant movements of the continental plates and possibly by an asteroid impact. C) Solar flares led to increased UV radiation intensity, which in turn promoted a high rate of mutation. This led to rapid diversification of animals. D) The massive growth of swamp vegetation depleted the atmosphere's carbon dioxide and eventually cooled the Earth's climate.