Question

5 multiple choice 1 point which one of the following statements is true regarding parathyroid hormone (pth)? it has the same function as calcitonin. it causes the breakdown of bone. it stimulates the release of growth hormone. it causes decreased activity of osteoclasts. it is released when blood calcium levels are high. 6 multiple choice 1 point osteoporosis is a common condition that essentially results when homeostasis cannot be maintained in ____ and ____. canaliculi; osteoclasts canaliculi; chondroblasts chondroblasts; osteoclasts osteoblasts; osteons osteoclasts; osteoblasts

Explanation:

For question 5:

• PTH raises blood calcium; calcitonin lowers it, so they are opposites. PTH stimulates osteoclasts to break down bone to release calcium, increases osteoclast activity, and is released when blood calcium is low.

For question 6:

• Osteoporosis happens when bone resorption (by osteoclasts) outpaces bone formation (by osteoblasts), meaning homeostasis between these two cell types is lost.

Answer:

1. It causes the breakdown of bone.
2. osteoclasts; osteoblasts