The video tutorial explains the skeletal system's composition, focusing on connective tissue. It highlights that not all connective tissue is bone, introducing cartilage as a flexible material. Examples include the nose and outer ears. The video discusses cartilage in animals like sharks and its presence in newborns, transforming into bone over time. It also covers cartilage's role in joints like knees and elbows.

What is the primary characteristic of cartilage that differentiates it from bone?

• It is flexible and tough.

• It is rigid and brittle.

• It is soft and spongy.

• It is dense and heavy.

Which part of the human body is made of cartilage, allowing it to be flexible?

• The skull

• The femur

• The nose

• The spine

Which animal is known to have a skeleton made almost entirely of cartilage?

• Shark

• Elephant

• Frog

• Eagle

In which stage of human development is the skeletal system mostly composed of cartilage?

• Elderly stage

• Newborn stage

• Teenage years

• Adulthood

Where in the human body does cartilage remain even after it transforms into bone in other areas?

• In the skull

• In the outer ears

• In the ribs

• In the spine