Los huesos

The video explains the role of bones in supporting and protecting vital organs. At birth, humans have about 300 bones, which fuse to around 200 in adulthood. Bones are living tissues that regenerate every 7 years and contain blood vessels, nerve endings, and cells. They adapt to physical activity, becoming stronger with use. The spine and skull are highlighted for their protective roles. Bones are diverse in shape and function, and they remain long after other tissues decay.

How many bones does a human have at birth, and how does this number change by adulthood?

• 300 at birth, reducing to about 200 in adulthood

• 200 at birth, increasing to about 300 in adulthood

• 200 at birth, reducing to about 100 in adulthood

• 300 at birth, remaining the same in adulthood

What is the approximate time it takes for every bone in the body to be completely regenerated?

• 7 years

• 5 years

• 10 years

• 12 years

What elements are primarily found in the hard, inert material that holds osteocytes together?

• Iron and magnesium

• Calcium and phosphorus

• Sodium and potassium

• Carbon and nitrogen

How does playing a sport like squash affect the bones of the racket arm?

• They become shorter and weaker

• They remain unchanged

• They become longer and stronger

• They become more brittle

What is the primary function of the spine in the human body?

• To store calcium

• To support the body's weight and allow movement

• To protect the brain

• To produce blood cells