Circulatory System form5
-
Upload
andrew-kannan -
Category
Documents
-
view
216 -
download
0
Transcript of Circulatory System form5
-
7/29/2019 Circulatory System form5
1/34
-
7/29/2019 Circulatory System form5
2/34
Circulation
The circulatory systemcarries blood and
dissolved substance to
and from different placesin the body.
Our body resembles a
large roadmap, There
are routes or arteriesthat take you downtown
to the heart of the city.
-
7/29/2019 Circulatory System form5
3/34
3 Major Parts of the Circulatory
system
Medium blood or haemolymph- carries important *stuff through
body
Heartpumps or pushes blood through body
Blood Vessels arteries, veins andcapillaries.
- routes blood travels
* Stuff includes oxygen, food, & waste
-
7/29/2019 Circulatory System form5
4/34
whats in
Erythrocytes
(red blood cells)Leucocytes
(white blood cells)
plateletsplasma
-
7/29/2019 Circulatory System form5
5/34
-
7/29/2019 Circulatory System form5
6/34
The Blood
plasma
red blood cell white blood cell
platelets
-
7/29/2019 Circulatory System form5
7/34
Plasma
A straw-coloured
liquid thatcarries thecells and theplateletswhich helpblood clot.
carbon dioxide
glucose
amino acids
proteins
minerals
vitamins
hormones waste materials
like urea.
It also contains usefulthings like;
-
7/29/2019 Circulatory System form5
8/34
Erythrocytes
-
7/29/2019 Circulatory System form5
9/34
Erythrocytes
contain haemoglobin, amolecule specially designedto hold oxygen and carry it
to cells that need it.
can change shape to an amazingextent, without breaking, as itsqueezes single file through the
capillaries.
a biconcave disc that isround and flat withoutanucleus
-
7/29/2019 Circulatory System form5
10/34
Platelets
Platelets are bits of cell
broken off larger cells.
Platelets producetiny fibrinogenfibres to form a net.
This net traps otherblood cells to form ablood clot.
-
7/29/2019 Circulatory System form5
11/34
Leucocytes
Fight and kill
germs thatmay enter your
bloodstream
-
7/29/2019 Circulatory System form5
12/34
Granulocytes Agranulocytes
Leucocytes
Neutrophils Eosinophils Basophils Lymphocytes Monocytes
-
7/29/2019 Circulatory System form5
13/34
Erythrocytes Leucocytes
Has biconcave disc
shape
No fixed shape
No nucleus Has a big nucleus
Transporting Oxygengases Fight infection invarious way
-
7/29/2019 Circulatory System form5
14/34
blood from the heart gets around
the body through blood vessels
There are 3 types of blood vessels
a. ARTERY
b. VEIN
c. CAPILLARY
-
7/29/2019 Circulatory System form5
15/34
lumen
Elastic fibreWall
(thick, muscular
and elastic)
Wall(thin, less muscular
and less elastic)
Arteries Veins
Wall(one cell thick)
Capillaries
-
7/29/2019 Circulatory System form5
16/34
The ARTERYArteries carry blood away from the heart.
Arteri membawa darah dari jantung
the elastic fibres allow
the artery to stretchunder pressure
Blood pressure is high
Carries blood from heart
to tissues (organ)
Bring oxygenated
blood except
pulmonary artery
Elastic fibre
-
7/29/2019 Circulatory System form5
17/34
The VEIN
Veins carry blood towards the heart.
Membawa darah kepada jantung
veins have valves whichact to stop the blood
from going in the wrongdirection.
Blood pressure is very low
Carries blood from
tissues (organ)to the
heart
Bring deoxygenated
blood except
pulmonary vein
-
7/29/2019 Circulatory System form5
18/34
-
7/29/2019 Circulatory System form5
19/34
The CAPILLARYCapillaries link Arteries with Veins
Menghubungkan arteri dan vena
the wall of a capillaryis only one cell thick
Enable the diffusion ofgases, nutrients,
hormones, waste productbetween blood and tissue
The exchange of materialsbetween the blood and thebody can only occur throughcapillaries.
lumen
endothelium(one cell thick)
cell
Blood content is mixed
-
7/29/2019 Circulatory System form5
20/34
artery vein
capillariesbody cell
The CAPILLARYA collection of capillaries is known as a capillary bed.
-
7/29/2019 Circulatory System form5
21/34
-
7/29/2019 Circulatory System form5
22/34
lungs
head & arms
liver
digestive system
kidneys
legs
pulmonary artery
aorta
pulmonary vein
main vein
LeftRight
How does this system work?
Circulatory System
-
7/29/2019 Circulatory System form5
23/34
Lungs
Body cells
Our circulatory system is a double circulatory system.
This means it has two parts
the right side of
the system
deals with
deoxygenatedblood.
the left side of
the system
deals with
oxygenatedblood.
Circulatory System
-
7/29/2019 Circulatory System form5
24/34
The Heart
These are arteries.They carry bloodaway from the heart.
This is a vein. It bringsblood from the body,except the lungs.
Coronary arteries,the hearts ownblood supply
The heart has four chambers
2 atria
2 ventricles
now lets look inside the heart
-
7/29/2019 Circulatory System form5
25/34
-
7/29/2019 Circulatory System form5
26/34
The Heart
Left Ventricle
Left AtriumRight Atrium
Right Ventricle
Tricuspid valve
Pulmonary vein
AortaPulmonary artery
Vena cava
Bicuspid valve
-
7/29/2019 Circulatory System form5
27/34
How does the Heart work?
blood from the
body
blood from
the lungs
- The heart beat begins when the
atria muscles relax and blood
flows into the atria.
-Deoxygenated blood (from whole
body) enter the right atrium via venacava
- oxygenated blood (from the lung)enter the left atria via pulmonaryvein.
STEP ONE
-
7/29/2019 Circulatory System form5
28/34
- The atria then contractand the valves open toallow blood into the
ventricles.- Blood in RA go through
tricuspid valve to enter
RV- Blood in LA go throughbicuspid valve to enterLV.
How does the Heart work?
STEP TWO
-
7/29/2019 Circulatory System form5
29/34
How does the Heart work?
- When the ventricles contract,the tricuspid and bicuspidvalve will close and semilunarvalves is forced to open.
- At the same time, blood ispushed into pulmonary arteryand aorta.
- At the same time, the atriaare relaxing and once again
filling with blood.- What happen when the
ventricles relax?
The cycle then repeats itself.
STEP THREE
-
7/29/2019 Circulatory System form5
30/34
Lub
If you listen toyour heartbeat,it makes a lubdub sound.
The lub is when bloodis pushed out of the
heart into the bodyand the dub is thereloading of the heartwith more blood readyto push it out to the
body
Dub
Th i f h t
-
7/29/2019 Circulatory System form5
31/34
The pumping of heart
Cardiac muscle is myogenic, which means
can contract and relax without the impulsefrom nervous system.
The pumping of heart coordinated by a
pacemaker The primary pacemaker is known as SA node
which located at upper wall of right atrium
The impulse from SA node will cause theatria to contract before the impulse reach the
AV nodes which located at the bottom wall of
right atrium.
-
7/29/2019 Circulatory System form5
32/34
From AV node, the impulses spread tobunle of His, bundle branches and
Purkinje fibres which cause the ventricles
to contract. The pacemaker is regulated by:
Parasimpathetic nerve: slow down the heart
beat Sympathetic nerve: speed up the heart beat.
Adrenaline hormone: speed up the heart beat
during fear/excitement
-
7/29/2019 Circulatory System form5
33/34
1.7 contraction of skeletal muscle
around the veins
Blood pressure in veins is lower compared
to artery.
Therefore, the flows of blood back to heart
are helped by
When the skeletal muscles contract, the
veins will constrict and the blood push
along the veins in one direction due to thepresence of valve in vein.
-
7/29/2019 Circulatory System form5
34/34
SUMMARY
copy and complete the following;
Arteries take blood ______ from the heart. The walls of an artery
are made up of thick _________ walls and elastic fibres. Veins
carry blood ________ the heart and also have valves. The
_________ link arteries and veins, and have a one cell thick wall.
Blood is made up of four main things ______, the liquid part of the
blood; Red Blood Cells to carry ______; White Blood cells to protect
the body from disease and _________ to help blood clot.
away
platelets
towards
capillaries
plasma
oxygen
muscular