While in the hospital recovering from her heart attack Ms. F. developed a condition known as atrial fibrillation, in which the myocytes of the atria depolarize and contract individually. How are the cells of the heart supposed to contract? (Hint: Think about the functions of the intercalated discs.) Why would it impair the functions of the heart as a whole to have cardiac myocytes contracting individually?

Andrew feels good about himself. he doesn't know exactly why he is so happy, but every day he looks forward to his schoolwork and chores. "i play a game," he says. "i make a list of everything i have to get done, and then i try to finish it all before a certain time. for some reason, i feel great when i beat my time." based on this information, why is andrew happy? he gets a proper amount of sleep he eats healthy meals he has a strong family support group he regularly meets his own goals