<span>Electrocardiography is the process of recording the electrical activity of the heart over a period of time using electrodes placed on the skin. These electrodes detect the tiny electrical changes on the skin that arise from the heart muscle's electrophysiologic pattern of depolarizing and repolarizing during each heartbeat. It is a very commonly performed cardiology test.
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I think option 2. Cos the first and last ones are about Geography and the 3rd one is just a theory
Answer:
Types of cells that exist in the human body as a result of cell differentiation are as follows :
- Sex cells
- Muscle cells
- Fat cells
- Bone cells
- Blood cells
- Nervous cells
- Epithelial cells
- Immune cells
- Skin cells
Explanation:
Cell differentiation is a process by which cells become specialized and tak on specific roles in an organism. During human development, a single cell (fertilized egg) differentiates into every different kind of specialized cell type found in the body, including all the cells mentioned above. Cells that a undifferentiated are referred to as stem cells.