What color is octopus blood?

red
blue
green
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Both squids and oc­to­pus­es have blue blood. They use an oxy­gen-­car­ry­ing molecule in their blood called hemo­cyanin that contains copper. In cold con­di­tions with low oxygen pres­sure, hemo­cyanin oxygen trans­porta­tion is more ef­fi­cient than he­mo­glo­bin oxygen trans­porta­tion.

Answers distribution

red
blue
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answers
flagUkraine
0%
94%
5%
0%
17
flagRepublic of Ireland
0%
84%
7%
7%
53
flagGermany
8%
82%
4%
4%
184
flagDenmark
13%
82%
0%
4%
23
flagPoland
8%
79%
6%
4%
16340
flagCanada
4%
78%
11%
4%
61
flagthe United Kingdom
9%
77%
8%
3%
505
flagthe United Arab Emirates
4%
77%
9%
9%
22
flagFrance
10%
76%
6%
3%
30
flagIndia
4%
74%
12%
5%
374
flagItaly
6%
72%
6%
13%
29
flagthe United States
8%
71%
12%
5%
1037
flagthe Philippines
13%
71%
11%
2%
45
flagthe Netherlands
14%
70%
9%
5%
55
flagMalaysia
10%
67%
17%
3%
28
flagAustralia
17%
66%
13%
1%
51
flagUU
14%
66%
11%
7%
27
flagSpain
20%
64%
8%
4%
25
flagNorway
10%
63%
12%
12%
49
flagPakistan
17%
48%
20%
7%
39

Gender

men79%
women82%
red
7%
7%
blue
79%
82%
green
7%
5%
yellow
4%
4%

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What color is octopus blood?
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Author: Kasia
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