bio 8 heart and exchange surfaces

exchange surfaces

parts of an organism over which they exchange substances with their enviroment

villi

-small intestine

-help absorb nutrients eg glucose + amino acids

alveoli

-lungs

-exchange o2 and co2

features of exchange surfaces

-large SA

-thib surfaces

-permeable surfaces for substances that they need

-good supply of external medium

how aveoli are adapted

-one cell thick walls

-moist walls

-very large surface areas

RIGHT SIDE OF HEART

vena cava

right atrium

right ventricle

pulmonary artery

LEFT HAND SIDE

Pulmanory vein

left atrium'

left ventricle

aorta

arteries

carry blood AWAY

-pumps blood at high pressure

-thick tissue around lumen

capillaries

-exchanges nutrients and oxygen with tissue (aveoli/villi)

-thin permeable walls

-low blood pressure

veins

-carrys blood TOWARDS heart

-thin walls and wide lumen

-low pressure blood

-valves=prevent back flow

celluar respiration

the process of releasing energy from glucose-contasntly happening in every living cell

aerobic

-plenty enough o2

-best way to repsire

anaerobic

-without o2

-least efficent

-only when WE HAVE TO

cons of anaerobic

-releases much less energy

-glucose is partially broken down

-lactic acid builds up =leads to cramps

anaerobic in plants

glucose→ ethanol + co2