Question 10 (5 points) When a bone is broken, such as when a child falls from a tree, the fragments and
areas around the break must be broken down by other cells before new bone growth
can happen and heal. Which cells break down old bone tissue?
Osteoblasts
Marrow cells
Osteocytes
Osteoclasts

Osteoclasts

Explanation:

The osteoclasts are enormous cells, with more than one nucleus, that originate from the bone marrow. Osteoblasts play a significant role in bone remodeling i.e. new bone growth, by helping to break down bone tissues- a process called BONE RESORPTION.

The osteoclasts perform an opposite role to that of osteoblasts (bone-forming cells). They degrade the mineral content of bone tissues and digest the remaining parts intracellularly in their vacuole. Calcium is released into the bloodstream after resorption of bones.

Therefore, according to the question, the fragments of a broken bone will be initially broken down by cells called OSTEOCLASTS before new bone tissue growth can occur.

advantage of using stem cells in medical research:

1.       it provides medical benefits in the fields of therapeutic cloning and regenerative medicine.

2. it provides great potential for discovering treatments and cures to a variety of diseases including parkinson disease, spinal cord injuries, diabetes, alzheimer’s disease and many more.

3. limbs and organ could be grown in lab from stem cells and then used in transplant or treat illness.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully