SCIENCE UNIT 2

1. The respiratory system

2. The circulatory system

2.1. The main organ of the circulatory system is the heart.

2.2. Blood is made up of p.asma red blood cells and cells fragments called platelets.

2.3. Plasma is a yellowish liquid which is 90% water it carries the nutrients and waste products.

2.4. Red blood cells give blood its colour they carry oxygen and carbon dioxide.

2.5. White blood cells give blood its colour they surround and absorb germs which enter the body.

2.6. When the body is losing blood because of a cut in the skin platelets join together and helps stop the bleeding.

2.7. Arteries carry blood from the heart to the rest of the body this blood contais oxygen.

2.8. https://www.youtube.com/watch?v=uKdZVt1vBlQ

2.9. Arteries carry blood from the heart to the rest of the body.

2.10. Veins carry the blood back to the heart.

2.11. Capillaries are tiny bloodvessels wich connect the arteries and the veins .

2.12. The heart is a hollow muscle wich pumps bood through the body usually beat between 60 and 100 times per minus.

3. The circulatory system our cells need oxigen(O₂) to combine with nutrients and to produce energy during this proccesthe cells produce carbon dioxide (CO₂).

3.1. The part f the respiratory system:

3.2. Nose

3.3. Mouth

3.4. Pharynx

3.5. Trachea

4. Digestion system

4.1. Nutrients are the substances wich plants and animals need in order to live and grow

4.2. The mouth and the nose our senses of smell triggers the prodution of saliva in our mouth this helps the theeth to crush the food.

4.3. The oesophagus the tongue shapes the food into a ball called a bolus when we swallow the bolus passes into the oesphagus.

4.4. The stomach is tio break down the food it does this by using its strong muscular walls and excreting gastric juices.

4.5. The small intestine once the food is dissolved into a liquid it passees into the small intestine here it mixes with bile which is produced by the liver and the pancreatic juices which are the pancreas.

4.6. The large intestine the waste that our body does not need passes to the large intestine here water from this waste is absorbed into the blood.

5. Excretory system

5.1. Eliminates or excretes waste products from the body excretes carbon dioxide,urine,and water the excreory system consist of the urinary system and the sweat glands

5.1.1. Renal arteries

5.1.2. Kiddney

5.1.3. Ureter

5.1.4. Bladder

5.1.5. Urethra