Mature bones cells are termed what?
Osteocytes
A lack of exercise would result in what type of bones?
Thin, and brittle bones
When stress is applied to a bone, what happens?
Osteoblast activity increases
The normal loss of bones that occurs with aging is called what?
Osteopenia
The longest and heaviest bone in the body is the what?
Femur
Decreasing the angle between bones is termed..
Flexion
Increasing the angle between bones is termed..
Extension
When the epiphyseal plate is replaced by bone, what does that mean?
Long bones have reached their adult length
Nodding your head up and down is an example of what?
Flexion and extension
What is great? Osteoclast activity when calcitonin is absent or present?
Osteoclast activity when calcitonin is absent
Vitamin D is necessary for what?
Absorption and transport of calcium and phosphate ions
The Parathyroid hormone..
- stimulates osteoclast activity
-increases the rate of calcium absorption
-decreases the rate of calcium excretion
-does stimulates osteoclast activity and decreases the rate of calcium excretion only
(all of these is the correct answer)
Cells that synthesize the organic commonest of the bone matrix are termed what?
Osteoblasts
Large, multinucleated cells that can dissolve the bony matrix are termed what?
Osteoclasts
The medullary cavity of bones contained what?
Marrow
The shaft of a long bone is called what?
The diaphysis
When sexual hormone production increases, bone growth does what?
Accelerates rapidly
The most abundant mineral in the human body is what?
Calcium
Elevated levels of calcium ion in the blood stimulates the secretion of the hormone what?
Calcitonin
The hormone calcitonin function to what?
Increase the rate of bone deposition
Which is greater? Blood calcium levels when parathyroid hormone is increased or decreased?
Blood calcium levels when parathyroid hormone is increased