5 Written questions
5 Matching questions
- parts of long bone (7)
- calcitonin secretion
- osteoclasts stimulates
- a osteoclasts, if the level of calcium in the blood is low & vitamin D systhesis (which increases the efficiency of absorption of calcium in the intestines)
- b bone forming cell
- c high blood calcium levels results in stimulation of osteoblasts and inhibit osteoclasts
- d 1. Diaphysis - shaft
2. Epiphysis - bulby ends, where muscles attach
3. Epiphyseal plate or disk - cartilage, plate=still growing, line=stopped growing (white line)
4. Medullary or marrow cavity - hollow, living bone has marrow
5. Periosteum - around the bone
6. Endosteum - lines the cavity, inside
7. Articular cartilage - covers head & bottom
- e like like little cracks, actually canals
5 Multiple choice questions
- 1. Bones grow in length at epiphyseal plate
2. Bones grow in diameter by the combined action of osteoclasts and osteoblasts
3. Osteoclasts enlarge the diameter of the medullary cavity
4. Osteoblasts from the periosteum build new bone around the outside of the bone
5. Bone formation = bone destruction in early to middle years
6. Remodeling activity important in homeostasis of blood calcium levels.
7. Remodeling occurs throughout life
women stop growing around the time of the start of their period, in case they get pregnant. don't want to compete w/baby for calcium.
males have denser bones
- specialized repair tissue that binds the broken ends of the fracture together.
- bone formation
- bone absorbing cell
breaks down the matrix
- air pocket in the bone
5 True/False questions
hemopoiesis → no calcium. deterioration of vertebral support.
1. Bones lose mass and become increasingly brittle and subject to fractures
2. More prevalent in women - postmenopausal
3. Men develop later in life - senile
genetics, diet & exercise
structure of the osteon (3 & 5 components) → 1. during bone formation osteoblasts remove calcium from blood, lowering its circulating levels
2. when osteoclasts are active and breakdown of bone predominates, calcium is released into blood & circulating levels will increase.
Functions of bone (5) → to make RBCs
1. Support (ex. to stand up)
2. Protection (ex. cover vital organs)
3. Movement - muscles covers - movement
4. Mineral storage - calcium, 98% of calcium is stored in bone. (too much calc. in blood, then store in bones - like a bank, can add to bank until 30-35)
5. Hematopoiesis (blood formation) - formation of blood cells, RBC, WBC, Platelets
can't live w/o calc.
appositional growth → growth in diameter
medula → layers, rings, aka matrix