Chapter 36 - The Skeleton And Muscles Flashcards
What controls the skeletal and muscles system?
Nervous system
What are the 5 functions of the skeleton?
Framework - support
Shape - tall
Protection - skull protects the brain etc
Movement - rigid levers that the muscles can pull
Manufacture of blood cells - bone marrow makes blood components
How many bones are in an adult body?
206
What are the names of the two parts of the skeleton?
Axial skeleton - skull, vertebrae, ribs, sternum
Appendicular skeleton - everything else
How many bones are in the skull?
22 bones fused together
How many vertabrae are in the spine?
33
What is the function of the vertebrae?
To protect and surround the nerves of the spinal cord
What is between the vertebrae?
Pad of fluid enclosed by cartilage called a disc
What is the function of the discs between vertabrae?
Shock absorbers and protect against the vertabrae from rubbing again each other
What are the five regions of the spine?
Cervical (neck) - 7 Thoracic (chest) - 12 Lumbar (small of back) - 5 Sacrum (hip) - 5 fused together Coccyx (tail) - 4 fused together
What are the three types of ribs?
True ribs - 7 pairs - attached to sternum
False ribs - 3 pairs - attached to rib above
Floating ribs - 2 pairs - attached to nothing
What is the pectoral girdle?
Contains collarbone and shoulder blade (clavicle and scapulae)
What is the pelvic girdle?
Contains hip bones which is attached to sacrum, pelvis,
2 halves (3 pieces each) joined by cartilage
Fused to spine
What bones are in the arm?
Numerous, radius, ulna, carpels (wrist), metacarpals (hand), phalanges (fingers)
What are the bones in the legs?
Femur, patella (knee), tibia (shin), fibula, tarsals (ankles), metatarsals (foot), phalange (toes)
What is compact bone made from?
Osteoblasts
What are osteoblasts?
Bone cells enclosed in a matrix
What do osteoblasts consist of?
70% inorganic salts (phosphate, calcium)
30% organic material (collagen)
Where is bone marrow?
Medullary cavity