On a Properly Calibrated ECG Machine, 1 MV Is Equivalent

question 3

Multiple Choice

On a properly calibrated ECG machine, 1 mV is equivalent to a height of ________ boxes.

• A) five small
• B) ten small
• C) one large
• D) four large

---

Definitions:

Ependymal Cells

Glial cells positioned along the brain's ventricles and the spinal cord's central canal, contributing to cerebrospinal fluid generation.

Oligodendrocytes

Glial cells in the central nervous system that produce the myelin sheath around neuronal axons, facilitating electrical conduction.

Myelin Sheaths

Insulating layers around nerves made of lipid and protein, enhancing the speed of electrical signal transmission.

Astrocytes

Star-shaped glial cells in the brain and spinal cord involved in physical support, maintenance of the blood-brain barrier, and nutrient and ion regulation.