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 |