Chapter 6

An osteon contains osteocytes, lamellae, and a central canal, and is found in compact bone only. True or False

True

Cartilage has a flexible matrix which can accomodate mitosis of chrondrocytes. True or False

True

Hematopoiesis refers to the formation of blood cells within the red marrow cavities of certain bones. True or False

True

Sixty-five percent of the mass of bone is a compound called hydroxyapatite. True or False

True

The structural unit of compact bone (osteon) resembles the growth rings of a tree trunk. True or False

True

The term osteoid refers to the organic part of the matrix of compact bones. True or False

True

The trabeculae of spongy bone are oriented toward lines of stress. True or False

True

________ growth is growth in the diameter of long bones.

appositional

A long bone forms by a process known as ________ ossification.

endochondral

All bones formed by intramembranous ossification are irregular bones. True or False

False

Bone tissue in the skeleton of a human fetus is completely formed at six months' gestation. True or False

False

Bones are classified by whether they are weight-bearing or protective in function. True or False

False

Compact bone is replaced more often than spongy bone. True or False

False

Each consecutive bone lamella has collagen fibers that wrap in alternating directions. True or False

False

In newborn infants, the medullary cavity and all areas of spongy bone contain yellow bone marrow. True or False

False

Short, irregular, and flat bones have large marrow cavities in order to keep the weight of the bones light. True or False

False

The periosteum is a tissue that serves only to protect the bone because it is not supplied with nerves or blood vessels. True or False

False

A round or oval hole through a bone that contains blood vessels and/or nerves is called a(n) ________.

foramen

A central (Haversian) canal may contain arteries, veins, capillaries, lymph vessels, and ________ fibers.

nerve

________ are multinucleated cells that destroy bone.

osteoclasts

________ is a disease of the bone in which bone reabsorption outpaces bone deposit, leaving the person with thin and often very fragile bones.

osteoporosis

A bone embedded in a tendon is called a(n) ________ bone.

sesamoid

Blood cell formation is called ________.

hematopoiesis