Author Question: What is the normal bone marrow cellularity in the population older than 65 years? a. 90 b. 70 ... (Read 71 times)

jazziefee

  • Hero Member
  • *****
  • Posts: 505
What is the normal bone marrow cellularity in the population older than 65 years?
 
  a. 90
  b. 70
  c. 50
  d. 30

Question 2

Why is there a relative lymphocytosis in a 2 year old?
 
  a. An absolute neutropenia occurs.
  b. The absolute number of lymphocytes is increased as the immune system develops.
  c. A greater proportion of neutrophils are marginated.
  d. Fewer lymphocytes are marginated.



mathjasmine

  • Sr. Member
  • ****
  • Posts: 312
Answer to Question 1

ANS: D
Bone marrow cellularity decreases in the older population and is approximately 30. That of a young adult is 50. This change may be caused by an increase in the volume of spongy tissue in the bone, as well as an increase in fat, rather than an actual decrease in hematopoietic tissue.

Answer to Question 2

ANS: B
An absolute increase in lymphocytes occurs, presumably because the immune system is developing as more antigens are encountered; this increases the absolute number of lymphocytes, as well as the relative percent. The number of marginated neutrophils is not increased; lymphocytes do not marginate.



Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
 

Did you know?

Many medications that are used to treat infertility are injected subcutaneously. This is easy to do using the anterior abdomen as the site of injection but avoiding the area directly around the belly button.

Did you know?

Signs and symptoms of a drug overdose include losing consciousness, fever or sweating, breathing problems, abnormal pulse, and changes in skin color.

Did you know?

Anti-aging claims should not ever be believed. There is no supplement, medication, or any other substance that has been proven to slow or stop the aging process.

Did you know?

Medication errors are three times higher among children and infants than with adults.

Did you know?

Looking at the sun may not only cause headache and distort your vision temporarily, but it can also cause permanent eye damage. Any exposure to sunlight adds to the cumulative effects of ultraviolet (UV) radiation on your eyes. UV exposure has been linked to eye disorders such as macular degeneration, solar retinitis, and corneal dystrophies.

For a complete list of videos, visit our video library