Chapter 6 Flashcards
7 Purposes of bones
Structure, protection, triglyceride storage, red blood cell formation, hormone production, movement, mineral and growth factor storage
Purpose of Osteoblasts and where they are derived from?
Build bone, derived from osteogenic cells
Purpose of Osteoclasts and where they are derived from?
Breakdown bone, derived from stem cells
Purpose of Osteocytes and where they are derived from?
They signal needed changes in bone. Derived from osteoblasts
Organic components of bone and function
Osteogenic cells, osteoblasts, osteocytes, bone-lining cells, osteoclasts, and osteoid. Collagen fibers give their tensile strength and flexbility
Inorganic components of bone and function
Hydroxyapatites (Calcium Phosphor Crystals/Salt) give bones their hardness.
Endochondral Ossification
Forms all bones except clavicle, cranium and mandible. Cartilage bones.
Intramembranous Ossification
Forms clavicle, cranium and mandible. Membrane bones.
Parathyroid gland function
Secretes parathyroid hormone when blood calcium is low. Activates osteoclasts to break down bone and release calcium into blood
Thyroid gland function
Secretes Calcitonin when blood calcium is high. Activates osteoblasts to build bone.
Osteomalacia/Rickets. Causes/Identifiers
Osteoblasts secrete osteoid. Soft/weak bones. Can be from a lack of vitamin D, bones curve in children.
Osteoporosis cause, risk factors, and most at risk population
Breakdown of bone exceeds bone build up. Risk factors include alcohol, low calcium intake, inactive lifestyle. Most at risk are Caucasian women, increase risk with age.
Stage 1 in healing a bone fracture
A hematoma forms.
Stage 2 in healing a bone fracture
Fibrocartilaginous callus forms
Stage 3 in healing a bone fracture
Bony callus forms
