Cats can purr for various reasons, using the soft rumble as a way of communicating and as a form of self-soothing or even healing. This is why cats will often purr when they're injured, or after a stressful event.
March of Dimes<span> is a United States nonprofit organization that works to improve the health of mothers and babies by preventing birth defects, premature birth and infant mortality. The organization was </span>founded<span> by President Franklin D. Roosevelt in 1938, as the National Foundation for Infantile Paralysis, to combat polio.</span>
Answer:
<u><em>The membrane potential is the basis for the conduction of nerve impulses along the cell membranes of neurons. Ions that are important in the formation of a nerve impulse include sodium (Na+) and potassium (K+). Ion channels and ion pumps are very specific; they allow only certain ions through the cell membrane.</em></u>
Explanation:
