The Skeletal System

How often do humans typically get a new skeleton due to bone regeneration?

• Every 7-10 years

• Every 20 years

• Every 3-5 years

• Every 12-15 years

What percentage of bone loss do astronauts experience each month in space?

• 0.5%

• 3-4%

• 5%

• 1-2%

Which type of bone marrow is responsible for making blood cells?

• Both red and yellow marrow

• Red marrow

• Neither red nor yellow marrow

• Yellow marrow

What is the primary function of osteoblasts?

• Building bone

• Storing energy as fat

• Producing blood cells

• Breaking down bone

How do astronauts try to mitigate bone density loss in space?

• By taking calcium supplements

• By undergoing surgery

• By exercising at least 15 hours a week

• By eating a high-protein diet