Lab 1

Question 1

What are the characteristics of life?

Answer 1

• contains nucleic acids, proteins, carb and lipids
  -composed of cells
  -Grow and reproduce
  -Use Energy and raw materials (metabolism)
  -Respond to stimuli
  -Maintain homeostasis
  -Population of living things evolve and have adaptive traits

Question 2

What is homeostasis?

Answer 2

Ability to maintain a relatively stable internal environment

Question 3

How does negative feedback help to maintain homeostasis?

Answer 3

The primary mechanism that is employed that is employed to counteract change to the set point of a physiological variable
-(negative feedback effects will be brought about through reflex arcs)

Question 4

How are reflexes involved in maintaining homeostasis?

Answer 4

Many reflexes occur without our conscious awareness

Question 5

List and describe the 4 classes of chemical messengers

Answer 5

Hormone
Neurotransmitter
Paracrine Substance
Autocrine Substance

Question 6

Hormones

Answer 6

Target cells in one or more distant places in the body

Question 7

Neurotransmitter

Answer 7

Neurons or effector cell in close proximity to site of neurotransmitter

Question 8

Paracrine substance

Answer 8

Target cell in close proximity to site of release of paracrine substance

Question 9

Autocrine substance

Answer 9

Autocrine substance acts on same cell that secreted the substance

Question 10

How does cell size relate to homeostasis?

Answer 10

The cell can do this most efficiently when the surface area is greater than the volume
-easier to diffuse / more energy efficient

Question 11

Condenser Lens

Answer 11

Light microscopes pass light through a specimen on a glass slide the light rays are focused directly on the specimen by _

Question 12

Ocular lens/objective lens

Answer 12

Optical system of two magnifying lens system

Question 13

Magnification labels

Answer 13

allows others to gain perspective on the actual size of a magnified object you are portraying

Question 14

Magnification

Answer 14

microscope refers to the ability to increase the visible size of a specimen

Question 15

Depth of field

Answer 15

Which is the range of distance ( near v far) that can be focused on at one time with good resolution

Question 16

Resolution

Answer 16

sharpness, the ability to distinguish two objects as separate

Question 17

How is total magnification calculated?

Answer 17

10x

Question 18

How does the orientation of an object change when viewing it through a microscope eyepiece vs. through the naked eye? Why?

Answer 18

Microscope provide upright & inverted imagine

Question 19

Define Field of View (FOV), Depth of Field (DOF), and Resolution as they relate to microscopy?

Answer 19

FOV-Area visible
DOF- Range of distance
Resolution-Clarity

Question 20

What three things should ALWAYS be done to a microscope before returning it to the cabinet?

Answer 20

-Turn the nose piece so the scanning object is in place
-use the coarse focus knob to raise the nosepiece to its highest position above the stage
-loosely drape the power cord over the ocular tube so it doesn’t pull on the light source