Skeletal, Respiratory, and Nervous Systems

What is the mammalian skeletal system composed of?

• Bones, cartilage, and skin

• Bones, cartilage, teeth, and joints

• Bones, muscles, and joints

• Bones, nerves, and cartilage

Where is cartilage found in the mammalian body?

• In the joints of bones, trachea, nose, larynx, and external ear

• Only in the external ear and nose

• Exclusively in the joints of bones

• In the vertebral column and trachea only

What cells are responsible for the transformation of cartilage into bone?

• Osteoclasts

• Hemopoietic cells

• Osteoblasts

• Mesenchymal cells

When does the conversion of cartilage to bone mostly occur?

• After birth

• Prior to birth

• During adolescence

• In old age

What are bones primarily composed of?

• Cartilage and muscle tissue

• Blood and lymph vessels

• Nerve fibers and blood vessels

• Blood and nerve fibers

What is the function of osteoclasts?

• They repair skeletal tissue

• They break down skeletal tissue

• They produce blood cells

• They store fat

What type of marrow is found in short-lived animals?

• Yellow bone marrow

• Red bone marrow

• No bone marrow

• Both red and yellow bone marrow

What types of stem cells are produced by red bone marrow?

• Hemopoietic and mesenchymal

• Osteoblastic and hemopoietic

• Mesenchymal and osteoblastic

• Hemopoietic and osteoclastic

What is the primary function of yellow bone marrow?

• It produces blood cells

• It stores fat

• It breaks down skeletal tissue

• It repairs skeletal tissue

Under what circumstances can yellow bone marrow convert to red bone marrow?

• During growth spurts

• Under extreme circumstances

• As the animal ages

• When there is an excess of fat