CAMBRIDGE YEAR 6 SCIENCE CAMBRIDGE YEAR 6 SCIENCE CHAPTER 3: HUMANSCHAPTER 3: HUMANS 3.1 WHERE ARE YOUR ORGANS Your body is about 60 % water by weight.Most of th water ar i! th body ces. Ces ar orga!ised i!to orga!s. "i#r is a bi$ or$a! %hi& ys a!' ars ar s(a&& or$a!s.3.1 WHERE ARE YOUR ORGANS Co()ositio! of %atr i! th bo'y 3.1 WHERE ARE YOUR ORGANS "i#r is a bi$ or$a!3.1 WHERE ARE YOUR ORGANS Ear is a s(a&& or$a! Eys ar s(a&& or$a!s3.1 WHERE ARE YOUR ORGANS Each orga! has its ow! "#!ctio!. Your eyes see$ your ears hear a!' your heart %#&%s bood. Our s'i! is th argest orga! i! our bo'y a!' %rotect th i!ter!a orga!s. *t a&so $i#s us our a%%eara!ce a!' sha%e. Th argest a!' hea(iest i!ter!a orga! i! th bo'y is th i(er. 3.1 WHERE ARE YOUR ORGANS 3.1 WHERE ARE YOUR ORGANS Th heart is i! th &idde of th body. Th e"t side of th heart is bigger tha! th right. 3.1 WHERE ARE YOUR ORGANS A hu(a! hart3.+ ORGAN*SAT*ONTh orga!s of your bo'y wor' together i! syste&s. Each syste& has a s,i!tifi, !a( a!' is (a' u) of di""ere!t orga!s. 3.+ ORGAN*SAT*ONSyste&Descri%tio! Cir,u&atory syst( Tra!s)orts b&oo' to a&& )arts of th bo'yMa' u) of th hart- th artris that ,arry th b&oo' a%ay fro( th hart- th ti!y ,a)i&&aris a!' th #i!s that ,arry th b&oo' ba,. to th hart/i$sti# syst( 0ra.s 'o%! foo' so it ,a! b absorb' by th s(a&& i!tsti!Starts %ith your (outh a!'!'s %ith th &ar$ i!tsti!Rs)iratory syst( Pro#i's o1y$! to your bo'y Ma' u) of th &u!$s a!' th air%ays 3.+ ORGAN*SAT*ONOr$a!s %or. i! syst(s- %hi,h %or. to$thr. 3.+ ORGAN*SAT*ONA doctor uss a stethosco%e to har your heart beat. Th hart bat ,o!sists of two so#!ds$ )#b*d#%+ b,aus th heart co!tracts a!' rea,es ater!atey. Your %#se is a&so your heart beat rate. 3.+ ORGAN*SAT*ON2i'o o! th hart:3.3 /*GEST*ONWh! you swaow your "ood$ it tra(es throu$h your digesti(e syste& -g#t.. O! its %ay- th "ood is digested a!' "i!ay absorbed by th s&a i!testi!e. /!digested "ood %i&& b harde!ed i! th arge i!testi!e a!' b,o(s "aeces. 3.3 /*GEST*ON3.3 0REATH*NG *N AN/ OUTYou !' o,yge! e(ery day$ #! if you ar see%i!g. 0itho#t o,yge!$ you ca!!ot reease th e!ergy fro( your "ood. Breathi!g i! is ,a&&' i!haatio!. Breathi!g o#t is ,a&&' e,haatio!.3.3 0REATH*NG *N AN/ OUT3.3 0REATH*NG *N AN/ OUT0rathi!$ i! a!' brathi!$ out3.3 0REATH*NG *N AN/ OUT0rathi!$ i! a!' brathi!$ out3.4 /EA"*NG W*TH WASTEA!othr i()orta!t syst( i! your bo'y 'a&s %ith 1,rtio!. E,cretio! is th re&o(a of waste %rod#cts fro( th bo'y.*f you did !ot e,crete waste$ it %ou&' b#id #% a!' har& your body. 3.4 /EA"*NG W*TH WASTE3.4 /EA"*NG W*TH WASTE/ri!e fro( th 'id!eys is stor' i! a ba$ ,a&&' th badder. Th uri! )asss out of your bo'y %h! you $o to th &a#atory. *t is %ae yeow i!,o&our. 3.4 /EA"*NG W*TH WASTETh .i'!ys a!' b&a''r3.4 /EA"*NG W*TH WASTE*f your 'id!eys "ai$ you ,a! us a diaysis&achi!e. A diaysis &achi!e is a! arti"icia 'id!ey. You (ay b ,o!!,t' to it for a! hour or (or- thr ti(s a %.. *t "iters your bood i!stead of your 'id!eys. 3.4 /EA"*NG W*TH WASTEA 'ia&ysis (a,hi!3.5 CONTRO""*NG YOUR 0O/YYour brai! is about th si1e of a coco!#t. *ts surfa, is wri!'ed$ &i. a wa!#t. Your brai! is i! co!tro of your body. E#rythi!$ you s a!' har- #rythi!$you s(&& a!' tast- is s!t to your brai!.*t a&so $ts si$!a&s fro( i!si' your bo'yabout a&& your or$a!s. 3.5 CONTRO""*NG YOUR 0O/YA (o'& of th hu(a! brai! 3.5 CONTRO""*NG YOUR 0O/YYour brai! 'a&s %ith a &ot of i&%orta!t b#si!ess witho#t botheri!g yo#.