The sudden death of brain cells when their blood supply is interrupted is called
a. a heart attack.
b. a stroke.
c. hypertension.
d. atherosclerosis.

Option B, a stroke

Explanation:

A stroke is caused by an interrupted blood supply which leads to the death of brain cells. The strokes are of two types –

a)Ischemic attack– In this a blood clot causes blocking of blood vessel. Ischemic attack is of two types –  

1.Thrombotic – This occurs primarily due to blood clotting in any vessel or artery

2.Embolic. This occur when a part of thrombus travels from its original site and blocks some other artery  

b)Hemorrhagic stroke – In this a blood vessel burst inside a brain thereby causing brain hemorrhage.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called