Given below are four statements (i-iv) regarding human blood circulatory system
Channel: Doubtnut
Date: 02/11/2021

Given below are four statements (i-iv) regarding human blood circulatory system (i) Arteries are thick-walled and have narrow lumen as compared to veinsii) Angina is acute chest pain when the blood circulation to the brain is reduced (iii)  Persons with blood group AB can donate blood to any person with any blood group under ABO systeiv) Calcium ions play a very important role in blood clotting Which two of the above statements are correct ?