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