When you touch something hot, a neuron in your finger senses the temperature. which best describes the first reaction the neuron has? a. sodium atoms travel through the veins. b. neurotransmitters cross a synapse. c. an action potential forms. d. ions flow out of the neuron.

An action potential forms

Explanation:

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the answer is :

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.