A&P Lab 5: The Microscope Flashcards Preview

Pre-Pharm > A&P Lab 5: The Microscope > Flashcards

Flashcards in A&P Lab 5: The Microscope Deck (15)
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1
Q

Rheostat

A

adjusts light intensity

2
Q

Base

A

supportive bottom piece of the microscope; includes the substage light

3
Q

Substage light

A

light within the base providing the light source for illumination of the specimen

4
Q

Head

A

AKA body tube; upper part containing the viewing pieces (ocular & objective lenses, rotating nosepiece)

5
Q

Ocular lenses

A

eyepieces; 2 removable lenses that you look through to observe the specimen

6
Q

Nosepiece

A

located below the ocular lenses, it serves as the objective lenses; can rotate to change from 1 objective lens to another

7
Q

Objective Lenses

A

3-4 objective lenses that are usually attached to the nosepiece, each with a different magnification; usually 4x (scanning), 10x (low), 40x (high), and 100x (oil immersion)

8
Q

Arm

A

narrow, vertical part connecting the head and base; may be straight or curved; contains the stage, coarse/fine adjustment knobs, condenser, & iris diaphragm lever

9
Q

Stage

A

flat platform connected to the arm and suspended beneath the objective lenses, upon which the microscope slide with its specimen is placed; often includes either a mechanical stage or stage clips, both of which keep the slide stationary during viewing

10
Q

Coarse adjustment knobs

A

2 knobs on either side of the base of the arm; usually the largest knobs; turning them raises and lowers the stage, bringing it closer to or farther from the objective lens; control the focus; should only be used at 4x or 10x to avoid contacting the objective lens with the slide

11
Q

Fine adjustment knobs

A

2 knobs usually located in the center of each coarse adjustment knob; used for precision focusing

12
Q

Condenser

A

lens located just below the stage; concentrates light on the specimen

13
Q

Iris diaphragm lever

A

lever located beneath the condenser; regulates light passing through the condenser

14
Q

Parfocal

A

changing objective lenses does not change the focus on the specimen

15
Q

Contrast

A

can improve the resolution of certain types of samples

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