7/25/2019 Molecular Motion and Cell Transport Mechanism

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MOLECULAR MOTION AND CELL TRANSPORT MECHANISM

DIFFUSION

1. What is meant by di!si"n# $%"&ess by 'hi&h m"(e&!(es m")es s$"ntane"!s(y *%"m an a%ea "* hi+h&"n&ent%ati"n t" a ("'e% &"n&ent%ati"n, hen&e "&&!%s d"'n anelectrochemicalgradient-d"'nhi((/0

# "n(y *"%m "* t%ans$"%t that is n"t &a%%ie%#mediated and d"es n"t %e!i%emetab"(i& ene%+y, hen&e is passive-C"stan2", 34110.

3. What a%e the *a&t"%s that ae&t the %ate "* di!si"n5Fa&t"%s in&(!de6

# am"!nt "* s!bstan&e a)ai(ab(e# the )e("&ity "* 7ineti& m"ti"n,# n!mbe% and si2es "* the "$enin+s in the memb%ane th%"!+h 'hi&h the

m"(e&!(es "% i"ns &an m")e -8!yt"n 9 Ha((, 344:0.

;. What is the $%in&i$a( d%i)in+ *"%&e "* di!si"n5#Di!si"n is d%i)en by the heat -the%ma( m"ti"n0 "* the m"(e&!(es, 'hi&h %e*e%s t"the &"nstant m"ti"n "* the $a%ti&(es (i7e 'ate% m"(e&!(es and diss"()eds!bstan&es *"!nd in the b"dy