The Function of Hair
Dating back to five million years ago, the first human ancestors needed hair to regulate...
What is body temperature?
The scale-like surface that protects the hair shaft from the dermis is called...
What are cuticles?
This is the first stage of the life cycle of hair.
What is the anagen stage?
Ingested or absorbed toxins can be detected by ______ of hair.
What is chemical analysis?
Color is not a microscopic detail but rather a ____ detail.
What is macroscopic?
Not so useful nowadays, but the hair across our body is needed to decrease...
What is friction?
This protein is produced by the skin, making the hair strong and flexible.
What is keratin?
2% of all hair growth and development happens in this stage.
What is the catagen stage?
During testing, the hair is dissolved in an organic that solvent breaks down this fiber.
What is keratin?
This type of microscope can be used to simultaneously view two different samples.
What is a comparison microscope?
Humans are born with ______ follicles.
What is five million?
The medulla is an inside layer, running down the middle of the...
What is the cortex?
In the telogen stage, what part of the hair is dormant?
When performing neutron activation analysis (NAA), hair is placed in this device and bombarded with high-energy neutrons.
What is a nuclear reactor?
This technique is useful for observing fine detail in hair structure.
What is phase contrast microscopy?
When hair flattens to release air, nerves are pulling on ______?
What are erector muscles?
This is the root of the hair.
What is a follicle?
How many days does the anagen stage last?
What is one thousand days?
The procedure for developing the timeline for exposure to chemicals is similar to ______ analysis.
What is hair color?
The typical magnification for hair is between ___ and 400 times.
What is forty?
Follicles provide forensic scientists with a kind of DNA called ______.
What is mitochondrial DNA?
At the end of the club-shaped follicle, ______ supplies blood and nutrients to the hair.
What is the papilla?
For most people, hair will grow gray in which stage?
What is the telogen stage?
Divide the distance of the toxin from the root by _____ to estimate the number of months since the toxin was ingested.
What is 1.3 cm?
Electron microscopes magnify an object up to ______ times or more.
What is fifty thousand?