Which of the following cardiac effects can be observed if the potassium concentration is increased two to three times the normal value?

Which organ remains functional for a few hours even after clinical death?

The blood bank of the body or the reservoir where blood is stored and can be mobilized is:

Which one of the following is a matching pair of a certain body feature and its value/count in a normal human adult?

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

Select the correct option for myogenic and neurogenic hearts.