A signal from the nervous system that is sent from the brain to the hand would follow a different pathway than a signal sent from the hand to the brain. True or False

Blood cells bring oxygen to cells and take carbon dioxide away. true or false

Which of the following is not a symptom of chronic fatigue syndrome

Felicia has a respiratory infection and has been coughing up a lot of mucus. she knows this means that her respiratory system is working to restore balance by getting rid of the invasive materials from her lungs. how does this happen?