Which example is a way that intracellular communication occurs? 1. A signal is sent from a nerve cell to a muscle cell.
2. A molecule is sent from one part of a cell to another.
3. A signal is sent down an exon within a nerve cell.
4. A signal is translated into action for a muscle cell to contract
HELP IM DOING A TEST RN

most community's take hundreds of years to become stable

the answer is b. glad to .

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.

the water is warmed up by the sun and then it evaporates into the atmosphere. the sunlight warms the water by its heat. water is then cooled down and condensation takes place. the water then finally returns back to the earth by the process of precipitation in the form of rain or ice.

explanation: