Given below are four statements (a-d)regarding human blood circulatory system:
(a)Arteries are thick-walled and have narrow lumen as compared to veins.
(b)Angina is acute chest pain when the blood circulation to the brain is reduced
(c)Persons with blood group AB can donate blood to any person with any blood group under AB
system.
(d)Calcium ions play a very important role in blood clotting.
Which two of the above statements are correct?
a) (a)and (b)
Answers
Answer:
heya❤
(a), (b) are the correct statements!
hope it helps
@aisha761
A)the first statement is true
B)Angina is acute chest pain when the blood circulation to the heart is reduced . this happens when the person suffering engaged himself in activities like running of exercising
But it disappears with rest
C)this statement is false AB Is a universal recepient and O is a universal donor
The reason behind this is antigen antibody reaction.when a the RBC of blood grp A contain antigen A which can produce antibodies on entering another body with blood grp B.
But a person with Blood grp A B has both the antigens and hence it does not produce antibodies when blood grp A B or O enter it's body
O is a universal donor as it doesn't contain antigens hence no antibodies are produced when it is donated to people having blood grpA ,B or AB
d) this statement is true clotting cannot take place in absence of calcium
I hope this helps (≧▽≦)