AIM What is blood made of?
12
In first aid, you learn how to help peopi. who are hurt.
An important first-aid rule Is: “Treat Serious Bleeding First.”
A person can die very quickly from Loss of blood.
What Is blood mad. of? Why Is blood sq Important to
II!.?
Blood has a liquid part and a solid part.
The liquid port of blood Is called plasma (PLAZ muh).
Plasma Is 90% water. Dfest.d food, Important ch.mI.
cals, and waste products are dissolved in plum.. The digested
food and chemicals are carried to the cells. The waste products,
Including waste heat, are carried away from the cell..
Thà solId port of blood Is made up of red blood cells,
white blood cell., and platelets.
• Red blood cells have a substance called hemoglobin
[NEE muh glob. lI1J. Oxygen links up with hemoglobin. The
red cells then carry th. oxygen to all parts of th. body.
Hemoglobin Is red. It gives blood Its color.
• White blood cells fight disease and Infection. They
desiroy harmful germs In the body.
• Platelets help stop bleeding. They give off a chemical
that helps blood to clot.
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___________
__
______
ABOUT BLOOD
Red blood cells
disks that are qu.ed
irs shaped ilk.
in the mlddI.
Thai, us many mars red cells than
white celia—about $00 ed calls for avery
one white call.
Just ons drop of blood has about
S million red blood cells. Au entir, body
has about 25 trillIon.
FIpreA
Look at FIgure 3. Then answer.
queedous.
1. WhIch kind of blood c.U Is the
FIgureR The solid parte of blood
2. WhIch kind of blood cell Is the
s—afloat?
2. a) Wh cells cciy oxygen?
WWbsnbVanieinthes.ceIIs
(
w
W makes red blood cells red?
Figure C What blood 1* maO 4.
,wtnE
w
ce”-
,“\
Sz?
LookFIpxsC.
S. Bloodismoetly
tAOkatFI$WeD.
S. Which cells fight Infection?
FIgureD A white blood cell deetroylng a
harmful germ.
—
7. Take a gueel
What happens to the number of
white blood cells when germs are in
the body?
(
17
Figar. K
Plotel.ta help form blood dots when your
skin I. out.
Look at FIgw. I.
I. Which pert of the blood help, stop ho
blaod1n?
I, Why do white blood cell. corn. to this are.?
—
IgUNY
A grownup ha. about $7 liters
pUits) of blood.
78
Y1ge.G
ua
Blood make. up abmd 9% of a person’s
weight. Poi example, If you w.Ih 45 kilo.
grams iioo pound.). 4 kJlomm. (9 pounds)
is blood.
__
__
__
__
__
_•
__
__
__
COMPLT!NG Camptit. the
Sen ce. with the choic
e. below.
SENTENCES One of thee. may ten
be used twice.
water
hemoglobin
5.7 lIters
chamJcels
pI.m.
1. Th.ilquld part of blood Is
called_____
______
2. Plwulsmoetly
3. Plum. carries dissolved
4. Oxypelscerriadbyth.
S. The substance In red cells tha 5
t link U with cygen Is cal
led
S. Theridcolerdbloodcvm
..frcmth.submance____
____
7.
fight Infection.
S.
helpbloadtoclot.
S. An adult has about_______
___
TRUEOR Wr1tsTccth.fth
emmberifthas.ic,tstr
u..
FALSE Write F If the nn’e Is fat...
1.
PlwneIsaaolId.
2.
Plasma Is meetly water.
3.
Plasma ceMse only diseokid mater
4.
Plume caMe. escyge. and digested
5.
Plum.cereti.wsts.toth.c.II
S.
Red blood cells fight Infection
.
7.
HemoglobIn Is found In rid blood
S.
Hemoglobin carrle dissolved foo
d.
Platelets make us bleed.
5,
10.
ials.
food to the cells.
cells.
That. are many more red blood cel
ls than white blood calls.
79