Once the neuron is excited, how does the message pass down the
axon to the knob?
A. Through potassium
B. Through the glia cells
C. The sodium pump
GUYS PLS HELP

Within each axon terminal are sacs, known as vesicles, filled with one of 50 different chemicals called neurotransmitters. ... When the neurotransmitters trigger the receiving neuron to fire, it sends an electrical "action potential" along its length the way that an electrical pulse flows down a metal wire.

Explanation:

The'res the long version just pick the answer out.

one would be wind another would be water density

the level of progesterone is low at the pre-ovulatory phase of the cycle but it gradually increases and the levels are high at the luteal phase. if pregnancy occurs, the level of progesterone will be high throughout the pregnancy.

if egg is fertilized and the mother gets pregnant, progesterone starts preparing the uterus for the implantation. it starts building up the lining of uterus and make it hostile of the period of pregnancy.