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