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 85 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
YES! Correct, THANKS for helping me on my review

cassie_ragen

  • Member
  • Posts: 347
Reply 3 on: Yesterday
Excellent

« previous next »
 

Did you know?

Approximately one in three babies in the United States is now delivered by cesarean section. The number of cesarean sections in the United States has risen 46% since 1996.

Did you know?

During the twentieth century, a variant of the metric system was used in Russia and France in which the base unit of mass was the tonne. Instead of kilograms, this system used millitonnes (mt).

Did you know?

By definition, when a medication is administered intravenously, its bioavailability is 100%.

Did you know?

Famous people who died from poisoning or drug overdose include, Adolf Hitler, Socrates, Juan Ponce de Leon, Marilyn Monroe, Judy Garland, and John Belushi.

Did you know?

Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.

Occurrence of stem cells at different stages of mammalian development Occurrence of stem cells at different stages of mammalian development
Whitefish blastula cells Whitefish blastula cells
Connections of Olfactory Receptor Cells with Glomeruli Connections of Olfactory Receptor Cells with Glomeruli
Crying Frequency in the Early Months In their first months of life, infants often cry for no appare Crying Frequency in the Early Months In their first months of life, infants often cry for no appare
The Main Macromolecules in Cells The Main Macromolecules in Cells
n electron micrograph revealing nucleosomes appearing as “beads" n electron micrograph revealing nucleosomes appearing as “beads"
Video: Pores and Ion Channels

For a complete list of videos, visit our video library