Download Role of Excretion

Role of Respiration
Brings in oxygen
Gets rid of carbon dioxide
Warms up Respiratory system
the air filter with the help of cilla
Organs of Respiratory system
Nose- cilla
Sinuses mucus keeps air warm and moist
Air passes into the windpipe which is
covered by the epiglottis this flap prevents
chocking
Trachea carries air to the bronchiole tubes
Lungs large soft organs that contain tiny air
sacs called alveoli surrounded by capillaries
1 nose—hairs inside trap dust particles these
hairs prevent them from entering the lungs
2 Nasal chamber—keeps the air you breathe
warm and the mucus keeps the air moist
3 windpipe (trachea)
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Epiglottis- small flap that covers the windpipe
Trachea- 15 cm and carries air to the bronchi
4 Bronchi 2 short tubes that carry air from the
trachea to the lungs
5 Lungs soft organs where chemical exchange takes
place
6 Bronchi enters each lung and separates into
smaller tubes which lead to tiny air sacs
7 These sacs are called alveoli ( look like clusters of
grapes, surrounded by capillaries where the gas
exchange takes place
Gas Exchange
Lungs
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Gas exchange
Oxygen in carbon dioxide out
 Blood around alveoli low in oxygen
 Breathe in oxygen fills alveoli, and passes into
blood by diffusion
 Blood arrives at the lungs and carbon dioxide
diffuses into alveoli from blood
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Breathing
Chest size changes due to the muscle
located along the bottom of your chest
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This muscle is call the diaphragm
Sheet-like muscle that separates chest from
intestines and abdomen
Respiratory System Problems
Carbon monoxide poisoning
Pneumonia (communicable)
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Microbes invade alveoli
Lung tissue forms extra mucus
Mucus and pus clog the alveoli making it difficult to
breathe
This blockage prevents o2 from getting into the
bloodstream
Emphysema (not communicable)
Lung disease
 Breakdown of alveoli
 Person always seems to be out of breath not
enough alveoli to get o2 into the blood
 Caused by smoking
 Air pollution
Role of Excretion
Removal of chemical wastes that are not needed by
the body or are harmful to the body
If not removed these wastes would poison and kill the
cells
 These wastes are either Removal of chemical
wastes that are not needed by the body or are
harmful to the body
 made by body cells or
 Come from undigested food
Removal of these wastes is called excretion.
Liquid waste is removed by the excretory
system
Urea> breakdown of body protein
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Poisonous, must be removed
Carried to the kidneys
Kidneys
Humans have two big as a fist
Kidneys filter blood they work similar to
filter paper
In one day your kidneys filter 200 liters
of blood
Path of Wastes
Blood carries wastes to kidneys
Urea filtered from blood
Filtered blood leaves kidney
Filtered blood returns to heart
Ureter carries wastes to bladder
Bladder (sac) that stores liquid waste
Urethra carries wastes from the bladder to
outside the body