The Skeletal System

Question	Answer
The skeletal system has 6 major functions...	1. Support 2. Shape 3. Protection 4. Mineral storage 5. Haematopoiesis 6. Leverage
There are 3 types of animal skeletons...	1. Hydrostatic skeletons 2. Exoskeletons 3. Endoskeletons
There are 5 main classifications of bone...	1. Long 2. Short 3. Flat 4. Sesamoid 5. Irregular
Bones are living tissues with distinct compartments; a long bone consists of...	1. An epiphysis on each end 2. A diaphysis in the middle 3. A metaphysis between each epiphysis & diaphysis
There are several types of bone tissue, including:	1. The periosteum 2. Compact bone 3. The endosteum 4. The medullary cavity 5. Spongy bone
Wolff's law states that...	Trabeculae are aligned along the principle lines of stress: they can adapt in response to pressure!
There are 3 types of bone cells...	1. Osteoblasts 2. Osteocytes 3. Osteoclasts
Osteoporosis and osteopetrosis are examples of bone pathologies due to impaired function of bone cells.	1. Osteoporosis a. "Brittle bones" b. Osteoclast activity > Osteoblast activity 2. Osteopetrosis a. Excessively thick bones b. Osteoblast activity > Osteoclast activity
Bone is composed of 67% inorganic component & 33% organic component.	1. Inorganic component a. Hydroxyapatite 2. Organic component a. 90% collagen b. 10% other proteins

Resource summary

	Created by Luke Evans over 6 years ago