- a fluid that transport subtances around the body
- contains cells
-
Blood Cell
- red blood cell (erythrocytes)
- white blood cell (leucocytes) - phagocytes
- lymphocytes
-
Plasma
- Platelets
BLOOD AS TRANSPORTATION
-
Red Blood Cell - carries oxygen to our body
-
Plasma
BLOOD AS PROTECTION
-
Phagocytes (white blood cell) - destroy and ingest foreign particles
-
Lymphocytes (white blood cell) - produce antibodies
-
Platelets - helps to clot the blood to prevent excessive loss of blood
RED BLOOD CELL
-
biconcave shape
-
no nucleus
-
red pigment called hemoglobin (contains iron)
WHITE BLOOD CELL
-
irregular shape
-
has nucleus
-
colorless
-
fight pathogens
RATIO OF RED BLOOD CELL - WHITE BLOOD CELL >> 700:1
BLOOD VESSELS
-
arteries
- carry blood away from the heart
- carry oxygenated bloof except pulmunary artery (deoxygenated blood)
-
capillaries - they deliver nutrients, oxygen and remove waste products
-
veins
- carry blood back to the heart
- deoxygenated blood except pulmunary veins (carries oxygenated blood)
- has valves that prevent the back flow of the blood
HEART
-
pumps blood to all parts of the body
-
four chambers : atria lower and upper, and ventricle lower and upper
-
lub and dub sound (heart beat)
BLOOD PRESSURE
-
a face axcerted on the blood vessels
-
measured by instrument called sphygmomanometer
-
highest when heart contracts (exercise,etc)
P.S. This is my note when my science teacher explained
Gosh, it's really useful =w= ufufuufu
BalasHapushahaha ini waktu kelas 8 chooo
BalasHapuscatetankuuuu hahahahahhahahaha