The Skeletal System: It's ALIVE! - CrashCourse Biology #30

Which animal's skull is described as being streamlined for swimming in water?

• Rhino

• Walrus

• Polar bear

• Pronghorn antelope

What is one vital function of the skeletal system?

• Digesting food

• Producing hormones

• Manufacturing blood

• Filtering waste

What type of skeleton allows animals to grow larger and have more freedom of movement?

• Hydrostatic skeleton

• Exoskeleton

• Endoskeleton

• Chitin skeleton

What material are human teeth primarily made of?

• Bone marrow

• Dentin and enamel

• Cartilage

• Keratin

What specialized cells are primarily responsible for forming the cartilage model that new bone tissue develops from?

• Osteoblasts

• Chondrocytes

• Osteoclasts

• Red blood cells

What is the name of the process where bone-building cells secrete collagen and absorb minerals like calcium and phosphate to form new bone tissue?

• Resorption

• Hematopoiesis

• Ossification

• Bone remodeling

Which type of bone tissue is softer, more porous, and contains marrow that produces blood cells?

• Compact bone

• Cortical bone

• Spongy bone

• Epiphyseal plate

During the process of bone remodeling, which cells are responsible for breaking down old bone tissue?

• Osteoblasts

• Chondrocytes

• Osteoclasts

• Blood stem cells