A pacemaker is a medical device that uses electrical impulses, delivered by electrodes contacting the heart muscles, to initiate and regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequate heart rate, either because the heart's native pacemaker is not fast enough, or there is a block in the heart's electrical conduction system.

Correct Option: C

A pacemaker is a medical device that uses electrical impulses, delivered by electrodes contacting the heart muscles, to initiate and regulate the beating of the heart. The primary purpose of a pacemaker is to maintain an adequate heart rate, either because the heart's native pacemaker is not fast enough, or there is a block in the heart's electrical conduction system.

Poliomyelitis , often called polio or infantile paralysis, is an acute, viral, infectious disease spread from person to person, primarily via the fecal-oral route.

Correct Option: C

Poliomyelitis , often called polio or infantile paralysis, is an acute, viral, infectious disease spread from person to person, primarily via the fecal-oral route.

Green leafy vegetables are rich in iron as well as calcium. For example, Spinach is a dark, leafy green vegetable which is high in iron. One cup of cooked spinach provides one with 6.5 mg of iron which is an essential mineral needed by the human body and is a component of many proteins, including hemoglobin, which helps red blood cells deliver oxygen to all areas of the body

Correct Option: C

Green leafy vegetables are rich in iron as well as calcium. For example, Spinach is a dark, leafy green vegetable which is high in iron. One cup of cooked spinach provides one with 6.5 mg of iron which is an essential mineral needed by the human body and is a component of many proteins, including hemoglobin, which helps red blood cells deliver oxygen to all areas of the body

Na+/K+-ATPase (also known as sodium-potassium pump) is an enzyme located in the plasma membrane of virtually every human cell and is common to all cellular life. In nerve and muscle cells the membranes are electrically excitable, which means that they can change their membrane potential, and this is the basis of the nerve impulse. The sodium and potassium channels in these cells are voltage-gated, which means that they can open and close depending on the voltage across the membrane.

Correct Option: C

Na+/K+-ATPase (also known as sodium-potassium pump) is an enzyme located in the plasma membrane of virtually every human cell and is common to all cellular life. In nerve and muscle cells the membranes are electrically excitable, which means that they can change their membrane potential, and this is the basis of the nerve impulse. The sodium and potassium channels in these cells are voltage-gated, which means that they can open and close depending on the voltage across the membrane.

Blood plasma is the straw-colored/pale-yellow liquid component of blood that normally holds the blood cells in whole blood in suspension. It makes up about 55% of total blood volume. It is mostly water (93% by volume), and contains dissolved proteins, glucose, clotting factors, electrolytes, hormones and carbon dioxide (plasma being the main medium for excretory product transportation).

Correct Option: D

Blood plasma is the straw-colored/pale-yellow liquid component of blood that normally holds the blood cells in whole blood in suspension. It makes up about 55% of total blood volume. It is mostly water (93% by volume), and contains dissolved proteins, glucose, clotting factors, electrolytes, hormones and carbon dioxide (plasma being the main medium for excretory product transportation).