for bugs.. OPEN CIRCULATORY SYSTEM
Insects have tubular hearts and it pump the haemolymph into fluid filled spaces, which is the haemocoel!
Haemolymph bathes the tissues and internal organs directly wee.
Nutrients - digested food substances + harmones diffuse for Haemo (hololololololo to the cells.
TIME FOR HUMAN BLOOD VESSELS!
Blood vessels, are tubes that transport one part of the human body, to another. REMEMBER DIS.
Arteries is veghyyyyyyy bad! It carries bloood away from the heart. Arteries branch out into Smaller vesssels that is arterioles. Arterioles pulak, brance out tiny lil vessels, which are the caterpie.. like pokemon. LOL CAPILLARIES YOU QT.
Capillaries - the sites for the exchange of respiratory gases, nutrients, &&&& wastes.
OK LETS PLAY A GAME!!
CAPILLARIES JOIN TO ONE ANOTHER TO FORM? .. VENULES!
VENULES JOIN TOGETHER TO FORM.. VEINS!
& VEINS TRANSPORT BACK BLOOD INTO THE HEART.
ok start over without refering to anything
capillaries join to one another to form venules venules join to one another to form veins & veins carry blood into the heart YAY .
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Differences :
Arteries : transport blood away from the heart,
carry oxygenated blood. The walls are THICK. got semilunar valves at the base of the aorta and pulmonary artery. small lumen
Capillaries : contact arterioles to venules.
site of change substances. THE WALLS ARE ZE THINNEST. no valves.
Veins : transport blood to the heart.
carry deoxygenated blood. THE WALLS ARE JUST THIN. YES TO PREVENT BACKFLOW. big lumen.
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HOW BLOOD IS PROPELLED THROUGH THE HUMAN CIRCULARY SYSTEM :
Heart =
coneshaped muscular (;)) organ in the thoracic cavity.
Size? clenched fist.
located between the lungs and slightly placed on the left side.
LOVE HAS FOUR CHAMBERS - two upper thin walled (atria). two lower thick walled (ventricle).
What's Septum? It seperates the Righing cham form the left cham. goodgirl.
Valves? haaa try to remember...
TO PREVENT BLOOD FROM BACKFLOW.. sooooooo it is to ensure blood flows only in one direction ;)
*** that oughta keep me awake ****
InsyaAllah HOPE SO i memorize parts of the heart ok now diastole and systole time. 1 2 3 go..
I have to imagine, bak kata spongybob.. IMAGINAAATIIIOONN~~~
ok. the valve between the left atrium and left ventricle is the bicuspid valve. the valve betwween right atrium and ventricle is tricuspid valve. @ the base of the aorta & pulmonary artery - semilunar valve.
The Heart, is made up of myogenic cardiac muscles.
Heart functions like two pumps with different pressure systems.
Right - bagi deoxygenated blood to the lungs.
Left - left has thicker walls before it pumps deoxygenated blood to all parts of the body. Oo sexy.
(SAN) sino-atrial node is a group of specialised cells located in the right atrial wall, near the entrance of the teenenen SUPERIOR vena cava.
it initiates the hearbeat. Generates wave which spread the two atria, causing them to contract simultaneously.
(AVN) antrio-ventricular node. lying at the base of right atrium and is then stimulated. impulses from av node are conducted by specialised muscle fibers! : Bundle of his & purkinje fibres to ventricular walls, causes the contraction of both ventricles to pump blood out of the heart.
Ala ^ part stillllll stuck lagi la. hm.
--
right ventricle pumps blood to the pulmanary artery which forces blood into the lungs :D
left ventricle, generates greater pressure to pump blood to the aorta then to the other arteries in the body!
WHATS THE CARDIAC CYCLE?
- series of events occur during one complete heartbeat.
one more time.
the cardiac cycles is the series of events occur during one comeplete heartbeat.
last one...
series of events occur during one complete heartbeat. Ok pass.
Contraction of Systole, and relaxation of Diastole of the atria and ventricles.
so ingat, diastole contract so valves OPEN.
Diastole on the other head, CLOSE.
72 hearbeat per minute.
Time blood flow dekat vein, pressure tak sufficient to force it back to the heart. so dia cool, it has to flow against gravitational pull.
How does the bloood in the veins flow back to the heart?
well ok, we move the skeletal muscles around it contract and press on the veins. Blood pressure increases, forces open valves forces blood towards the heart ;)
The sino atriol node can initiate the hearbeat on its own. The sympathetic nerve carrying impulses to the heart can increas the heart rate. The parasymphatic pulak the nerve can slow it down.
increase of the partial pressure or co2 can also increase our heart rate.
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During systole, the blood pressure is V high. During diastole the blood p is the lowest.
Stretch sensitive receptors are known as baroreceptors. located in the walls of aorta and caratid arteries branch out form the aorta.
OK HIGHTLIGHT DIS
-an increase of blood pressure, stretchers the aorta.
- decrease of blood pressure, increases the stimulation of sino atrial node by the sympathetic nerve.
a person's blood p can be be measured by ? SPHYGMOMANOMETER.
what.
shygmomanometer.
why so complecated.
ok.
sphygmonameter. failed.
sphygmomanometer.
sphygmomanometer
k i hope tak masuk yang tu. konfiuzing.
CIRCULATORY SYSTEMS IN OTHER ANIMALS
Closed = us humans and fish and amphibians.
Fish, single circulation.
others, double.
open - insects.
FISH
has two chambered heart, atrium and ventricle.
ventricle if the heart pumps deoxygeblood to the gills gills oxy plak then hantar to various types of body capillaries. deoxy b from the body cap returns to the atrium of the heart.
HEART GILLS BODY HEART.
thats it fr now gonna do some speed reading two more topics fr bio. nights
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