The hair of various animals may significantly differ in their structure. What are these differences...
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Transcript of The hair of various animals may significantly differ in their structure. What are these differences...
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Problem № 12Structure of a
hair
Reporter - Toma RtveliashviliTeam - Georgians
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Task Condition
The hair of various animals may significantly differ in their structure. What are
these differences and how can you explain them?
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Plan
About hair functions About hair structure It’s components Types of different components of the
hair Functions of each component Difference between various animals’
(including human) hair About hair colors and reasons of its
variety About hair textures and reasons of its
variety Experiment Conclusion
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Hair functions
Thermal regulation
Camouflage
Protectionfrom
predators
Protection from dirt, sweat and
rain
Touch sense
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Hair structure
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Diagram of hair in the skin
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Proximal
Distal
Electron Photomicrograph of
Hair
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Combinations of these types
coronal (crown-
like)
spinous (petal-like)
imbricate
(flattened)
Types of cuticle
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Coronal scale
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Cuticle of bat’s hair
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Pteropus giganteus
Rousettus leschenaulti
Cynopterus sphinx
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P. giganteus
R. leschenaulti
C. sphinx
Regions: Dorsal Ventral Neck
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Spinous scale
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Americ
an mink
Imbricate extreme crenate scale pattern of the
thick section of the mink hair
Coronal dentate scale pattern of the first half of the hair
from the root
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Imbricate scale
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Human
Alpaca
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Hair cortexEumelanin
Pheomelanin
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Black hair
Mongoloid
Negroid
Caucasian’s hair
Red hair
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Hair as a camouflage in animals
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HydrogenConnection
s
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Hair texturesCross section of hair
Mongoloid
Negroid
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3 main amino acids, that are increased in mole’s hair, in
comparesion to other animals
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Water + Hair Ethanol + Hair
Experiment
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Medulla
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References
1) Sherrow, Victoria (2006). Encyclopedia of Hair: A Cultural History. 88 Post Road West, Westport, CT: Greenwood Press. p. iv.
2) Krause, K; Foitzik, K (2006). "Biology of the Hair Follicle: The Basics". Seminars in Cutaneous Medicine and Surgery 25: 2–10.
3) Feughelman, Max (1997). Mechanical Properties and Structure of Alpha-keratin Fibres: Wool, Human Hair and Related Fibres. UNSW Press.
4) Steve Jones, Robert Martin & David Pilbeam, ed. (1994). "The Cambridge Encyclopedia of Human Evolution". Cambridge: Cambridge University Press.
5) Dixson, A.F. Sexual Selection and the Origins of Human Mating Systems. Oxford University Press, USA; 1 edition (2009)
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Thanks For Attention!!!