This topic contains a solution. Click here to go to the answer
« previous next »

Author Question: What is the most likely reason for cells on a hemocytometer appearing fuzzy when switching from low ... (Read 41 times)

Davideckstein7

  • Hero Member
  • *****
  • Posts: 555
on: Jun 25, 2018
What is the most likely reason for cells on a hemocytometer appearing fuzzy when switching from low power to the 40 objective?
 
  a. Condenser not lowered enough
  b. Hemocytometer not cleaned properly
  c. Oil on the 40 lens
  d. Cells not allowed to settle

Question 2

Which of the following microscopic procedures requires high contrast and lower light?
 
  a. Examining unstained objects (e.g., urine sediments)
  b. Evaluating red cell morphology
  c. Manual differentials
  d. Platelet estimates


Related Topics

Need homework help now?

Ask unlimited questions for free

Ask a Question
Marked as best answer by a Subject Expert

joshraies

  • Sr. Member
  • ****
  • Posts: 351
Reply #1 on: Jun 25, 2018
Answer to Question 1

ANS: C
Oil should never be allowed to touch any lens that is not an oil immersion lens. If it mistakenly does get on the 40 lens, then the object will appear fuzzy and unclear. The condenser should be in the highest position for best visualization. If a hemocytometer is dirty, then it will make it difficult to distinguish cells from debris. If cells are not allowed to settle, then they will not all be in the same plane of focus and some may be missed for counting purposes.

Answer to Question 2

ANS: A
Urine sediments are generally unstained. To improve the contrast, and thus the ability to identify the elements, requires high contrast and lower light. All the other items use a Wright-stained blood film for evaluation. The stain allows for contrast between the various cell components; these are all performed using an oil immersion lens, thus requiring a large amount of light.


Davideckstein7

  • Member
  • Posts: 555
Reply 2 on: Jun 25, 2018
Wow, this really help

lkanara2

  • Member
  • Posts: 329
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

People about to have surgery must tell their health care providers about all supplements they take.

Did you know?

A good example of polar molecules can be understood when trying to make a cake. If water and oil are required, they will not mix together. If you put them into a measuring cup, the oil will rise to the top while the water remains on the bottom.

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.

Did you know?

The newest statin drug, rosuvastatin, has been called a superstatin because it appears to reduce LDL cholesterol to a greater degree than the other approved statin drugs.

Did you know?

As many as 28% of hospitalized patients requiring mechanical ventilators to help them breathe (for more than 48 hours) will develop ventilator-associated pneumonia. Current therapy involves intravenous antibiotics, but new antibiotics that can be inhaled (and more directly treat the infection) are being developed.

Cells involved in specific immunity in vertebrates. Cells involved in specific immunity in vertebrates.
Communication by direct contact between cells. Communication by direct contact between cells.
Cells Cells
Adenosine triphosphate (ATP) is the most common molecule used by cells to captur Adenosine triphosphate (ATP) is the most common molecule used by cells to captur
The Cells of the Innate Response The Cells of the Innate Response
Formation of Blood Cells Formation of Blood Cells
Video: Parkinson's Disease

For a complete list of videos, visit our video library