Dab tsi txiav txim siab xim ntawm daim tawv nqaij xeem ntawv?
Dab tsi txiav txim siab xim ntawm daim tawv nqaij xeem ntawv?

Video: Dab tsi txiav txim siab xim ntawm daim tawv nqaij xeem ntawv?

Video: Dab tsi txiav txim siab xim ntawm daim tawv nqaij xeem ntawv?
Video: Khaws kev nyuaj siab mus qhia tswv ntuj | Nkauj ntseeg tawm tshiab 2024, Lub rau hli ntuj
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Peb physiological yam uas cuam tshuam rau xim tawv nqaij yog: ntim ntawm cov ntshav nyob rau hauv cov hlab ntsha dermal, carotene nyob rau hauv subcutaneous txheej, thiab ntau yam kab mob. keratinized heev thaum lawv tuag vim tsis muaj ntshav txaus. Cov leeg arrector pili yog tsim los ntawm cov leeg nqaij striated.

Hauv qhov no, dab tsi txiav txim siab txog cov xim ntawm daim tawv nqaij?

Cov xim ntawm cov tawv nqaij tiag tiag ntawm tib neeg sib txawv yog cuam tshuam los ntawm ntau yam tshuaj, txawm hais tias ib qho tseem ceeb tshaj plaws yog cov xim melanin . Melanin yog tsim tawm hauv cov tawv nqaij hauv cov hlwb hu ua melanocytes thiab nws yog lub hauv paus tseem ceeb ntawm cov tawv nqaij ntawm cov neeg tawv nqaij.

Tom qab ntawd, lo lus nug yog, dab tsi xim txiav txim siab tawv nqaij quizlet? - Thaum twg tawv nqaij raug tshav ntuj, melanocytes tsim ntau melanin xim , ua rau tanning.

Hauv qhov no, dab tsi cuam tshuam rau daim tawv nqaij xim quizlet?

Ib puag ncig yam uas cuam tshuam cov xim ntawm daim tawv nqaij suav nrog ultraviolet lub teeb los ntawm qhov sib npaug lossis hnub ci thiab X duab hluav taws xob. Yuav ua li cas physiological yam cuam tshuam rau cov tawv nqaij xim ? Zoo oxygenated ntshav thiab dilated cov hlab ntsha redden lub tawv nqaij . Carotene tuaj yeem hloov pauv tawv nqaij daj daj.

Melanin cuam tshuam li cas ntawm daim tawv nqaij quizlet?

Tus nqi ntawm melanin ua rau tawv nqaij xim kom sib txawv ntawm daj daj mus rau xim liab-xim av rau dub. Qhov txawv ntawm ob hom ntawm melanin , tshuaj pheomelanin (daj mus rau liab) thiab eumelanin (xim av rau dub), feem ntau pom tseeb hauv cov plaub hau.

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