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Science
Circulatory system
| Question | Answer |
|---|---|
| What is the circulatory system responsible for? | delivering food and oxygen to the cells and removing wastes |
| What are the 3 main parts of the circulatory syslem | pump (heart), the vessels and the blood. |
| how much blood does an average adult have | 6L |
| what does blood carry to the cells. What does it remove | water, oxygen and other nutrients. it gets rid of CO2 and waste materials from the cells |
| what makes up 40% of our blood | red blood cells, white blood cells and platelets |
| what makes up 60% of our blood | plasma |
| What makes up 90% of plasma | water |
| what does the plasma do | has all the blood cells suspended in it and dissolves many chemicals |
| Where are RBCs made | in the bone marrow |
| how long does the average RBC live for | 120 days |
| what makes our blood the colour it is | RBCs |
| what do RBCs contain | Haemoglobin |
| What does haemoglobin do | carries Co2 and O2 around the body |
| how many RBCs in one drop of blood | 5 million |
| Which is bigger,White or red blood cells | White |
| how many RBCs to 1 white blood cell | 600 |
| what is are the white blood cells main jobs | to get rid of bad bacteria by producing chemicals to kill them or destroyng them |
| Where are the White blood cells made | Bone marow |
| What are platelets | broken up cells |
| Do platelets have a necleus | no |
| what do platelets do | patch up and fix broken tissue |
| how many platelets in 1mL of blood | 400,000 |
| Where do arteries carry blood | AWAY from the heart to the external organs |
| what do arteries have | thick elastic walls |
| what do arteries divide into | capillaries |
| how wide are capillaries | one cell tick |
| what are the capillaries main job | to exchange oxygen, O2 and other nutrient in the cells |
| Where do the veins go | back to he heart where the blood is pumped back to the lungs to get more oxygen |
| how many beats a minute happen in a chlds heart | 90-120 |
| how many heart beats a minute for adults | around 70 |
| what triggers each heartbeat | nerve impulses within the heart |
| what is the heart made of | cardiac muscle |