Hydroxyapatite found in bone matrix contains a combination of which molecules in its crystalline structure?
a. Calcium and magnesium
b. Calcium and phosphate
c. Phosphate and magnesium
d. Magnesium and hydrogen
ANS: B
Calcium and phosphate form amorphous (fluid) calcium phosphate compounds that are convert-ed, in stages, to solid hexagonal crystals of hydroxyapatite. Hydroxyapatite does not contain magnesium or hydrogen.
You might also like to view...
A woman speaking of a rival for her husband's affection says in a gushy, syrupy voice "She is a
lovely person. I simply adore her.". The woman may be demonstrating a. reaction formation. b. denial. c. projection. d. repression.
The nurse is caring for a patient with bacterial pneumonia. Which classifications of medications should the nurse expect to be prescribed for this patient?
Select all that apply. 1. antibiotics 2. steroids 3. bronchodilators 4. antiemetics 5. antihistamines
The nurse has received a report about a woman in labor. The woman's last vaginal examination was recorded as 4 cm, 60%, and –1. The nurse's assessment of this report is the cervix is _____, with the presenting part 1 cm _____ the ischial spines
a. 4 cm dilated and 60% effaced; above b. effaced 4 cm and dilated 60%; above c. effaced 4 cm and dilated 60%; below d. 4 cm dilated and 60% effaced; below
The nurse is concerned that a client is not aware of being in the hospital. For what aspects of the sensory process should the nurse assess the client?
1. Speech 2. Stimuli 3. Receptor 4. Perception 5. Impulse conduction