A patient has come to you for an iron infusion. The patient is a bit concerned that all of this is unnecessary, after all, why do we need iron in the first place? Why would a lack of iron make her so tired. How would you explain to the patient the importance of iron in the body.
Iron is important as it's what makes up haemoglobin. Haemoglobin forms part of your blood cells (specifically red blood cells) and is important for carrying oxygen. Our body relies on oxygen to live and function. When there is less iron in the body, there is less haemoglobin. Without haemoglobin, there is less oxygen being carried by the blood throughout the body. One of our organs that relies heavily on oxygen to function is our brain. WIthout oxygen, our brain can't function normally, making us feel tired, confused and unable to think. This can be very dangerous, as being confused, tired and unable to think is not a great state to be in when making important decisions or operating machinery, or driving your car!
5+x = 9 Find x.
What is x? why do we use letters in math? x is just a fill in. Using letters is a tidy way of saying "a number that we don't know yet".We could also write the equation like this. 5 + (unknown number) = 9 But it looks much nicer (and saves a lot of time) to write a letter of the alphabet. you could also write the equation like this: 5+ k = 9 or 5 + b = 9 or 5 + z = 9 Pick a letter, you can use it! Sometimes we'll have lot's of different numbers in an equation that we don't know, so we'll have to represent them each differently. For example= 5 + a + b = 9 Here, you'd need to find out two different numbers! But that's a harder equation we'll learn later. We need to learn the basics first! Let's get back to the original equation. 5 + x = 9 Using what we already know, 5 + (unknown number) = 9 So how do we figure this out? We could guess, but when our numbers get bigger, this would take a long time. What do we do? lets write this equation in another way. 5 apples + (unknown number of apples) = total of 9 apples We have 9 apples (which we known is already made up of a group of 5 apples). If we take that group away, we'll be able to find out the number of apples left. Therefore, that group will be the "unknown number of apples. Let's Try. 5 apples + (unknown number of apples) = total of 9 apples (unknown number of apples) = total of 9 apples - 5 apples (unknown number of apples) = 4 apples. Answer = 4 apples. Let's double check if that works. 5 apples + 4 apples = total of 9 apples. That's correct! So how would this look when we use correct "math language". 5 + x = 9 x = 9 - 5 x = 4 Answer is x = 4. That is x, the number we don't know, is 4. Does that work? 5 + 4 = 9 Yes it does! Well done!
What is a reflex?
A reflex is when you unconciously (that is, without think about it) react in response to a stimulus. For example, when you touch a hot stove with your hand, you automatically pull your hand back to prevent further injury - imagine the damage you would do if you just left it there! Therefore, a reflex is a protective response. Usually, it would take a long time for the signal from your burning hand to travel down your arm, up your spine, to your brain. Where then your brain would make the decision to move your hand, which would travel back down your spine, along your arm to then move your hand. By this point, a lot of damage has already happened to your hand! So how does the body speed up this reaction? A reflex makes this process much faster, by bypassing the brain (that is, leaving it out of the decision). So the signal travels from your hand up your arm, to the spine, back to your arm and moves your hand. All the while the signal is also moving up to your brain to let it know what's just happened (and incase you have to make any further decisions, like first aid). By that point (hopefully), you're already out of danger. That's why often you'll react to something before even realising what you've reacted to or why.