organising animals and plants Flashcards
blood is made of…
plasma
platelets
white blood cells
red blood cells
blood plasma
transports…
CO2 from organs to the lungs
urea from the liver to the kidneys to make urine
soluble products of digestion from the small intestine to other organs
red blood cells
biconcave discs- no nucleus
red pigment- haemoglobin
use their haemoglobin to combine with oxygen
carry oxygen to all the organs
white blood cells
have a nucleus
form part of the bodies defense system against microorganisms
platelets
small fragments of cells
no nucleus
help blood clot at wounds
arteries
carry blood away from the heart
have thick walls containing muscle and elastic tissue
veins
carry blood towards the heart
have thinner walls than arteries
have valves to prevent the backflow of blood
capillaries
narrow, thin walled vessels
carry the blood through the organs
allow the exchange of substances with all living cells in the body
vena cava
brings deoxygenated blood into the heart
pulmonary vein
brings oxygenated blood from the lungs
aorta
carries oxygenated blood around body
pulmonary artery
takes deoxygenated blood to the lungs
epidermal tissue
covers the plant
palisade mesophyll
many chloroplasts and can photosynthesise
spongy mesophyll
large surface area for diffusion of gases
