1) The RESPIRATORY SYSTEM is the part of the human body related to BREATHING (Taking in oxygen and letting out carbon dioxide).
The RESPIRATORY TRACT is the group of tubes which air goes in and out: Nasal passages, pharynx, larynx, trachea and bronchi, which end in the alveoli. The lungs are like sponges and contain the bronchi and the alveoli.
BREATHING has 3 stages:
1. INHALATION: Taking air into the lungs.
2. THE EXCHANGE OF OXIGEN AND CARBON DIOXIDE with the blood.
3. EXHALATION: Letting air out of the body.
2) The CIRCULATORY SYSTEM is the part of the body that distributes nutrients and carries waste to the organs that eliminate it. It consists of:
- The HEART
- The BLOOD VESSELS
The BLOOD is the red liquid in our body.
The HEART pumps the BLOOD through the BLOOD VESSELS. The HEART has 4 chambers.
The BLOOD goes from the HEART to the BODY ORGANS and then comes back to the HEART. It's like a circuit.
3) EXCRETION is expelling waste.
The respiratory system releases carbon dioxide into the air.
The digestive system expells waste from the anus.
The EXCRETORY SYSTEM is made up of:
- 2 KIDNEYS (they filter the blood & make urine)
- 2 URETERS (tubes that carry urine from the kidneys to the bladder)
- The BLADDER (it contanis urine. It is full when we want to go to the toilet9
- The URETHRA (the tube that carries urine from the bladder to the toilet)
The SKIN eliminates waste through SWEAT GANDS, too.
Good job kids! Now you are sweating, you can rest.
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