Journey To The Human's Body


hunger signals

Me and my friends went in a trip to a human body so we can discover what happens inside. when we arrived to the stomach we saw the sensory nerves in the lining of the stomach feel the stimulus which is low sugar level and contracting of the stomach and send it to the vagus nerve.the vagus nerve sends the message to the brain (hypothalamus). While sending the message something was happening in the nerve cell which is sodium-potassium pump. When the impulse passes the action potential happened. An action potential requires ion channels in the membrane that have gates that open and close. gated channels for Na+ open quickly, and Na+ ions rush into the cell. This stimulates adjacent Na+ channels down the axon to spring open. Na+ ions rush into the cell, and then those ion channels snap shut. In this way, the area of positively charged membrane moves down the axon. At the same time Na+ channels are springing open and snapping shut, K+ ion channels are opening and closing more slowly. K+ ions diffuse out of the axon and cause part of the membrane to return to resting potential. Because K+ channels are slow to respond to the change in axon’s charge, they appear to open and close behind the moving impulse. Before an action potential moves into the next neuron, it crosses a tiny gap between the neurons called a synapse. The axon terminal, the part of the axon through which the impulse leaves that neuron, contains chemical-filled vesicles. When an impulse reaches the terminal, vesicles bind to the terminal’s membrane and release their chemicals into the synapse. Neurotransmitters are the chemical signals of the nervous system. They bind to receptor proteins on the adjacent neuron and cause Na+ channels in that neuron to open, generating an action potential.


  • At the same time the stomach acts like a gland so it produce ghrelin. This is a chemical message sent by the bloodstream to the hypothalamus . Once it receives the message, delivered by ghrelin, that the body needs to eat something to keep the body running, the hypothalamus triggers the release of neuropeptide Y, which stimulates the appetites.


The person ate after he was stimulated , at the same time the hypothalamus sent message to the pituitary and the pituitary produced hormone which affected the pancreas and then the pancreas produced glucagon to balance the sugar level in the stomach.