Functions of Bone Cells and Structure

This video tutorial reviews the skeletal system, focusing on the functions of bones, their classification by shape and tissue type, and the structures within bones. It explains the roles of different bone cells and how calcium is regulated in the body. The tutorial also covers the importance of bone marrow and growth plates, and how exercise influences bone growth.

What is one of the primary functions of the skeletal system?

• To produce hormones

• To protect internal organs

• To regulate body temperature

• To digest food

Which type of bone is characterized by being long and supporting body weight?

• Irregular bones

• Flat bones

• Short bones

• Long bones

What is the main characteristic of compact bone?

• It stores fat

• It is porous and light

• It contains osteons

• It is found only in the skull

Where is spongy bone typically found?

• In the outer layer of all bones

• In the medullary cavity

• In the epiphysis of long bones

• In the diaphysis of long bones

What is the role of trabeculae in spongy bone?

• To connect muscles to bones

• To produce red blood cells

• To provide structural support

• To store calcium

Which type of bone cell is responsible for building bone tissue?

• Osteoclasts

• Osteocytes

• Osteoblasts

• Chondrocytes

What is the primary function of osteoclasts?

• To produce cartilage

• To maintain bone matrix

• To break down bone tissue

• To build new bone

Which hormone is known to decrease calcium levels in the blood?

• Vitamin D

• Calcitonin

• Parathyroid hormone

• Insulin

What is the role of vitamin D in calcium regulation?

• It decreases calcium absorption

• It increases calcium absorption

• It inhibits osteoblast activity

• It promotes fat storage

How does the body respond when blood calcium levels are too low?

• The body increases fat storage

• The thyroid gland releases calcitonin

• Osteoclasts release calcium from bones

• Osteoblasts store more calcium in bones