7-The Skeletal System

The shaft of a long bone, known as the ___, is composed mainly of compact bone.

• epiphysis
• diaphysis
• medullary cavity
• epiphyseal plate

The central canal of an osteon is surrounded by concentric rings of bone, each layer of which is called a(n) ___.

• canaliculus
• lamella
• lacuna
• perforating canal

Abnormal curvature of the lumbar portion of the spine is called ____.

• lordosis
• scoliosis
• kyphosis
• rickets

The ___ girdle is made up of the two hip bones.

• pectoral
• pubic
• liliac
• pelvic

The type of bone cell responsible for the reabsorption of bone is called an ____.

• osteocycte
• osteoblast
• osteogenic cell
• osteoclast

The highest arch of the foot is the ____ arch.

• longitudinal
• transverse
• medial longitudinal
• medial

The tiny cavities in the osteon called lacunae contain ___.

• osteocytes
• osteoblasts
• osteoclasts
• chondroblasts

Over-activity of the anterior pituitary gland results in excessive secretions of growth hormone and which chronic condition?

• acromegaly
• spina bifida
• cleft palate
• osteomalacia

The interior of the shaft of long bone contains the ___.

• medullary cavity
• cortical cavity
• medullary sinus
• cortical sinus

Which common metabolic disease presents with irregular thickening and softening of the bones?

• gigantism
• Paget's disease
• osteoporosis
• rickets