Bones Crash Course Quiz #19

What is the main purpose of the mission of Scott Kelly and Mikhail Kornienko?

• To explore the possibility of life on other planets

• To study the effects of weightlessness on the human body

• To search for derelict ships in space

• To test the effects of space travel on mental stability

What is the most serious damage caused by a microgravity environment?

• Loss of muscle mass

• Puffy faces

• Trouble sleeping

• Damage to the bones

What is the function of bones in the human body?

• Provide support and scaffolding

• All of the above

• Store energy as fat

• Regulate blood calcium levels

How much bone loss do astronauts experience in space every month?

• 1-2 percent

• 5-6 percent

• 7-8 percent

• 3-4 percent

What is the main function of red bone marrow?

• Produce the hormone osteocalcin

• Store energy as fat

• Make blood cells

• Regulate blood calcium levels

What is the structure of long bones?

• Longer than they are wide

• Thinner and irregular

• Flat and thin

• Cube-shaped

What is the main function of osteoblasts?

• Break down bone tissue

• Initiate bone remodeling

• Build new bone tissue

• Regulate blood calcium levels

What is the process called when osteoclasts break down old bone tissue?

• Resorption

• Remodeling

• Reconstruction

• Regeneration

What stimulates bone remodeling and ultimately bone strength?

• Lack of exercise

• Stress and strain

• Sedentary lifestyle

• Low calcium intake

What happens to the osteoclasts in low gravity?

• They increase their rate of bone resorption

• They stop functioning

• They initiate bone remodeling

• They decrease their rate of bone resorption