endorphins

"My brain was working overtime trying to remember all the vocabulary words for my spelling test. "

"The doctor prescribed morphine to relieve the patient's severe pain. "

"Important types of property include real property (land), personal property (other physical possessions), and intellectual property (rights over artistic creations, inventions, etc.)."

"During puberty, teenagers experience many physical and emotional changes because their bodies are producing more hormones. "

"While walking to school, Sarah found a lost wallet on the ground. "

"The body uses a specific peptide to signal hunger, prompting us to eat. "

"The after-school program is a great way for kids to continue learning. "

"A good night's sleep energized her for the busy day ahead. "

"The intricate making of the model airplane showcased the student's skill. "

"The group of students worked together on their project. "

"The teacher praised the students' similar answers on the math quiz. "

"When you feel happy, your brain releases neurotransmitters like serotonin, which carry the signal to feel good from one nerve cell to another. "