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Flashcards in The body - The respiratory system Deck (10)
1

Excretory organs

Lungs
Skin
Kidneys

2

What do the lungs excrete

Remove carbon dioxide and waste vapour from body

3

What does skin excrete

Remove water and salts (sweat)

4

What do the kidneys excrete

Remove waste in form of urine

5

The breathing system

Breathe in (inhale), take in oxygen from air.
Combines with food to give energy (oxidation).
Waste products (carbon dioxide + water) formed.
Get rid when breathe out (exhale).

6

Structure of the breathing system

Air passes through series of pipes as it goes from nose and mouth to lungs.

Passes through nose + mouth, warmed + hairs in nose filter.

Passes through space at back of mouth (pharynx)

Flap of skin (epiglottis) covers opening of trachea to prevent food in.

Passes through larynx (voice box), contains vocal cords.

Travels into trachea (windpipe).

Trachea divides into two tubes (bronchi). Bronchus divides again to form narrow tubes (bronchioli). At end are air sacs (alveoli). Here oxygen reaches blood + carbon dioxide removed.

7

Position of the lungs

In chest.
Like large pink sponges which expand as they are filled with air and shrink as air removed. Surrounded by rib cage, breast bone, back bone.

Heart is between lungs.

8

Excretion

Removal of waste from body

9

Function of the lungs

Take oxygen in
Remove carbon dioxide
Remove water

10

Exchange of gases

Alveoli (air sacs) have very thin walls, covered with capillaries (tiny blood vessels).

Oxygen passes from sacs through walls and into blood in capillaries. Carbon dioxide passes from blood into sacs (exchange of gases).