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6 responses

1. 

   Peter

   23 June, 2023

   i think the answer to the last question isn’t correct.
   haemoglobin is present when our blood is red (oxygenated) and when it’s blue (deoxygenated).

   Reply
   1. 

      David Shaw

      23 June, 2023

      Hi Peter,
      Thanks for your comment! It’s true that Haemoglobin changes colour when it’s deoxygenated, and it can appear blue when you look at the veins on your wrists and other places. But deoxygenated blood is still very definitely red – it’s just a deeper, purpleish red.

      There’s a really good photo of the difference on the wikipedia page for blood. (Warning for those who are squeamish about blood)
      https://en.wikipedia.org/wiki/Blood

      Thanks again for your comment!

      Reply
2. 

   MICHAEL MICHIE

   23 June, 2023

   Excuse me, but you haven’t answered question #1. You asked how many types, then gave one answer in groups and another answer in sub-types.

   So, are you saying that groups are the same as types; or there’s another ‘class’ so there’s groups, types and sub-types; or groups and sub-types but sub-types are really types, so there’s groups and types; or is it something else entirely?

   I really like the quizzes, but not this one.

   Reply
3. 

   David Shaw

   26 June, 2023

   Hi Michael,
   Thanks for your comment.
   Blood types are hard to explain, but I’ll see if I can shed a bit more light on it all.
   The main point of blood typing is for blood donations and transfusions. If you stick someone else’s blood in your own veins, it sometimes causes problems.
   Humans have 2 main systems for their blood types. First, there are some letters that come from your ABO type – that can be A, AB, B or O. Then, there’s a + or – from your Rh type.
   Combined, there are 8 main blood types, calculated by multiplying the number of ABO options and the number of Rh options.

   Cows have 11 different systems, compared to the 2 we were talking about in humans. And some of the cow systems have lots of options – the cow B system has 80 different forms compared to human ABO only having 4.

   When you multiply all the possibilities from all 11 systems, the number of blood types for cows gets very, very big. And that makes it very difficult to do blood transfusions between cows.

   I hope this helps!

   Reply
4. 

   Leanne Coventry

   5 July, 2023

   For questions #4 both platelets and green blood cells are not human cells.

   Platelets are not true cells but are actually fragments of cells.
   https://www.ouhsc.edu/platelets/platelets/platelets%20intro.html

   Reply
5. 

   David Shaw

   6 July, 2023

   Hi Leanne,
   That’s a good point! I’ll see if I can change the question a tad to make it more accurate

   Reply