Microscopy of human blood cells and blood vessels | Exit Quiz | Oak National Academy

Match each part of the microscope to its name.

• D

• eyepiece lens

• B

• focus wheels

• A

• light source

• C

• objective lenses

Answer explanation

The eyepiece lens at the top of the microscope is where we observe the magnified image. The coarse and fine focus wheels enable us to ensure the image is sharp and clear.

Part E is called the ...

Answer explanation

Part E is the stage, where the slide is placed.

On this microscope, the eyepiece lens has a magnification of x10, and the objective lens has a magnification of x40. What is the total magnification?

• x10

• x40

• x50

• x400

Answer explanation

The total magnification in this case is x400, which is the magnification of the eyepiece lens multiplied by the magnification of the objective lens.

Four students have used a microscope to observe blood cells. Each person has drawn their observations of a red blood cell. Who has produced the best scientific drawing?

• Andeep

• Jacob

• Jun

• Sam

Answer explanation

A good scientific drawing has solid lines, is not shaded, is labelled with straight label lines drawn with a ruler, and does not include arrowheads on the label lines.

A student observed a sample of blood using a light microscope. The structure labelled A is …

• a red blood cell.

• a vein.

• a white blood cell.

• an artery.

Answer explanation

White blood cells fight infections. They are much less common in the blood than red blood cells (which transport oxygen), are larger than red blood cells, and have large visible blobs inside (which are their cell nucleus).

These structures observed using a light microscope are an artery and a vein. Which statements explain why structure B is a vein?

• It has a narrow lumen.

• It has a wide lumen.

• It has a thick wall.

• It has a thin wall.

Answer explanation

Veins have a wide lumen (inside space), so blood flows through them at low pressure. This means the wall can be thinner, as it does not have to contain blood at high pressure.