1. How does a threshold prevent a neuron from generating too many action potentials?
A threshold ensures that action potentials are not produced unless the neuron has received enough stimulation.
2. What might happen if a drug blocked neurotransmitter receptors?
Neurotransmitters would not be able to bind with the receptors and initiate impulses in the neuron.
3. Hyponatremia occurs when people have very low amounts of sodium in their body. How might the nervous system be affected if the person had this condition?
Sodium is important in generating action potentials, thus low amounts of sodium would make it so neurons are less able to transmit signals. In reality, hyponatremia often occurs as a result of overhydrating. It can cause dizziness, headache, lethargy, slow muscle response, twitching, cramps, confusion, coma. It is known to happen to marathon runners when they have not be replenishing sodium levels inside their bodies. This is why drinks with salts such as Gatorade are popular and beneficial for athletes.
4. Dendrite comes from the Greek word dendron, which means "tree." Explain how the root word related to the meaning of dendrite.