Ligand gated channel is an essential membrane protein that has pores and allows the passage of specific ions across the plasma membrane when it is activated by a specific chemical . Examples of such ions that pass through Ligand gated channels are Sodium ions, Potassium ions, Calcium ions. Ligand gated channels are found in extensions of the nerve cells.
<h2>The answer that is correct is the: Third statement.</h2>
Explanation:
Heart is one of the most essential organ in the human body as it is responsible for supplying nutrients and oxygen to all the parts of the body and collecting waste materials and carbon dioxide from all the parts of the body through the blood.
The cells (fibroblasts, cardiomyocytes, etc.) of the heart itself are provided with the nutrients and oxygen by a specialized blood vessel called the Coronary Artery.
Waste materials and carbon dioxide are removed from the cells of the heart by another specialized blood vessel called the Coronary Vein.
Due to aging or consumption of excess fat and cholesterol rich food, the concentration of lipid molecules in blood get increased beyond normal.
These lipid molecules get deposited in the walls of the arteries, including the coronary artery, forming plaques, resulting in the development of atherosclerosis.
This reduces the diameter of the arteries, including the coronary artery, thereby reducing the blood flow through them.
Due to plaque deposition, the coronary artery is incapable for carrying sufficient oxygen and nutrients to the heart cells, causing their death.
This results in the development of a sharp pain in the chest that is diagnosed as Heart Attack or Myocardial Infarction.
