A&P Ch6

Which of these is a primary role of the skeletal system? A) leverage B) muscle attachment site C) calcium homeostasis D) All of these are primary roles of the skeletal system.

Osteoblasts differentiate from __________. osteoclasts osteomedullary cells osteoprogenitor cells osteocytes

Osteoblasts are squamous cells that develop into ___________. osteocytes osteoprogenitor cells osteoclasts Osteoblasts develop into all three of these cell types.

Which of the following characteristics applies to the cells known as osteoclasts? The cells secrete matrix. They are stem cells. They are mature bone cells. The cells dissolve matrix.

Spongy bone comprises an open meshwork of osseous spicules called __________. concentric lamellae osteons trabeculae lacunae

The type of bone that forms the diaphysis of a long bone is called __________ bone. spongy compact cancellous trabecular

During endochondral bone formation, the primary ossification center is located in the __________. distal epiphysis metaphysis diaphysis proximal epiphysis

What structure is necessary for a bone to grow in length? lacunae periosteal bud epiphyseal cartilage diaphysis

Which of these forms by intramembranous bone formation? humerus carpal bones long bones mandible

Endochondral bone development begins with the formation of a(n) __________. metaphysis epiphysis cartilage model diaphysis

Migration of blood vessels into the central region of the cartilage bone model, starting bone development, occurs at which site? secondary ossification center epiphysis periosteum primary ossification center

Migration of osteoblasts into the ___________ creates the __________. epiphysis, primary ossification center diaphysis, tertiary ossification center epiphysis, secondary ossification center diaphysis, secondary ossification center

If osteoblasts are more active than osteoclasts, bones may become __________. stronger denser thicker Any of these changes may result if osteoblasts are more active than osteoclasts

Which of these cell types plays a role in bone remodeling? Which of these cell types plays a role in bone remodeling? osteocyte osteoclast osteoblast All of these types of cells are involved in bone remodeling.

Which of these factors does not contribute significantly to normal bone formation? potassium intake exercise growth hormone calcium intake

Which of these is not required for normal bone formation? vitamin E vitamin A vitamin D thyroid hormone

Calcitriol is required for __________. absorbing dietary calcium and phosphate activating osteoclasts collagen synthesis quieting osteoblasts

Parathyroid hormone causes what response in the kidneys? increased rate of calcium uptake retention of calcium ions decreased calcium ion retention increased osteoblast activity

A drop in blood calcium levels stimulates the secretion of __________. calcitonin growth hormone parathyroid hormone thyroid hormone

What is normally found at a fracture hematoma? dead bone bone fragments blood clot All of these are found at the site of a fracture hematoma.

When a fractured bone heals it leaves a thickened region known as a ____________. bone scab tuberosity fracture hematoma callus