Osteocyte Functions and Bone Remodeling

The video tutorial explains the role of osteocytes in the skeleton, accounting for 90% of bone cells. It discusses the development of osteocytes from stem cells and their function in bone remodeling, which is influenced by circulatory, metabolic, and mechanical factors. Osteocytes maintain the bone matrix and regulate calcium and phosphate levels. They have a unique structure with dendrites for communication and act as mechano sensors to adapt to mechanical stress. The regulation of bone remodeling involves calcitonin and PTH.

What percentage of cells in the skeleton are osteocytes?

• 50%

• 100%

• 70%

• 90%

Which type of bone cell is responsible for creating new bone?

• Osteoblast

• Chondrocyte

• Osteoclast

• Osteocyte

Which factor is NOT mentioned as affecting bone remodeling?

• Genetic

• Mechanical

• Metabolic

• Circulatory

What is the primary component of osteoid?

• Type II Collagen

• Type I Collagen

• Calcium

• Phosphate

How do osteocytes communicate with each other?

• Through blood vessels

• Via nerve signals

• Through gap junctions

• By direct contact

What is the function of dendrites in osteocytes?

• To facilitate communication

• To produce osteoid

• To store calcium

• To absorb nutrients

What role do osteocytes play in response to mechanical stress?

• They produce more osteoclasts

• They decrease bone density

• They increase bone remodeling

• They inhibit bone growth

Which hormone stimulates osteoblast activity?

• Glucagon

• Parathyroid hormone (PTH)

• Calcitonin

• Insulin

What is the lifespan of osteocytes?

• Decades

• Several years

• A few months

• A few days

What is the primary function of osteocytes in bone?

• To produce blood cells

• To store fat

• To produce cartilage

• To act as mechanosensors