A man age 60 or older should be able to perform as many push-ups as a man age 35 to qualify for a high level of fitness in upper body muscle endurance

Which kind of bone cell tears down bone to release calcium and phosphate into the blood?

A) osteoprogenitor cells B) osteoclasts C) osteoblasts D) osteocytes

Olfaction is mediated by

A) mechanoreceptors. B) thermoreceptors. C) proprioceptors. D) chemoreceptors.