Skeletal System (Amoeba Sisters Edpuzzle)

What is the main protein found in bones?

• Collagen

• Chitin

• Lysosomes

• Osteoblasts

Answer explanation

The main protein found in bones is Collagen. Collagen provides structure to our bodies, protecting and supporting the softer tissues and connecting them with the skeleton. It is not Chitin, which is a component of insect exoskeletons, nor Lysosomes, which are organelles in cells. Osteoblasts are cells that produce bone, but they are not proteins.

Which type of skeleton do humans have?

• Hydrostatic skeleton

• Exoskeleton

• Endoskeleton

• Sesamoid skeleton

Answer explanation

Humans have an endoskeleton. This type of skeleton is located internally, providing support and protection for the body's organs. Unlike an exoskeleton, it does not cover the body's exterior. A hydrostatic skeleton is found in soft-bodied animals like worms, while a sesamoid skeleton refers to specific bones embedded within tendons or muscles.

What is the function of the skeletal system?

• Supporting the body and protecting organs

• Storing minerals

• Producing blood cells

• All of the above

Answer explanation

The skeletal system has multiple functions. It supports the body and protects organs, acting as a structural framework. It also stores minerals, which are essential for various bodily functions. Additionally, it is responsible for producing blood cells. Therefore, all the given options are correct.

How many bones does an adult human generally have?

• 206

• 300

• 150

• 100

Answer explanation

An adult human generally has 206 bones in their body. This number is lower than the number of bones in a newborn, which is around 300, as some bones fuse together during growth. The other options, 150 and 100, are incorrect as they are lower than the actual count of bones in an adult human.

Which part of the skeletal system includes the bones in the skull and ribcage?

• Axial skeleton

• Appendicular skeleton

• Long bones

• Short bones

Answer explanation

The axial skeleton is the correct choice because it includes the bones in the skull and ribcage. The axial skeleton forms the central axis of the body and consists of the skull, vertebral column, and ribcage. The appendicular skeleton, on the other hand, includes the limbs and girdles. Long bones and short bones are types of bones, not parts of the skeletal system.

Which type of bone is longer than it is wide?

• Long bones

• Short bones

• Sesamoid bones

• Flat bones

Answer explanation

Long bones are the correct choice because they are characterized by their elongated shape, being longer than they are wide. This type of bone is primarily found in the limbs and serves as a support structure for the body, as well as aiding in movement. Short bones, sesamoid bones, and flat bones do not have this elongated shape and serve different functions within the skeletal system.

What is the function of chondrocytes?

• Making bone

• Breaking down bone

• Maintaining cartilage

• Producing blood cells

Answer explanation

Chondrocytes are the cells found in healthy cartilage. They produce and maintain the cartilaginous matrix, which consists mainly of collagen and proteoglycans. Therefore, the function of chondrocytes is maintaining cartilage, not making bone, breaking down bone, or producing blood cells.

What is the purpose of bone remodeling?

• Replacing damaged bone

• Releasing minerals

• Growing bones in length

• All of the above

Answer explanation

The purpose of bone remodeling includes all the options provided. It involves replacing damaged bone, which is a continuous process that replaces old bone tissue with new. It also involves releasing minerals into the bloodstream, which is crucial for maintaining mineral balance in the body. Lastly, it contributes to the growth of bones in length during childhood and adolescence.

What is the outer layer of bone tissue called?

• Compact bone tissue

• Spongy bone tissue

• Yellow marrow

• Red marrow

Answer explanation

The outer layer of bone tissue is called the Compact bone tissue. This layer is dense and provides strength and protection to the bone. It is not the Spongy bone tissue, which is found inside the bone, nor the Yellow or Red marrow, which are found within the cavities of bones.

What is the collection of blood that forms at the site of a bone break called?

• Fracture hematoma

• Internal callus

• External callus

• Osteoclasts

Answer explanation

A fracture hematoma is the correct answer because it is the collection of blood that forms at the site of a bone break. This occurs when blood vessels are damaged during the fracture, leading to blood pooling and clotting at the site. The other options, internal callus, external callus, and osteoclasts, are related to bone healing and remodeling but do not specifically refer to the collection of blood at the fracture site.