What word describes nerves and muscles that work as a unit with the brain?

Explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?

Which of the following is not considered a lymph node function? to house immune cells to transport lymph to filter blood to fight infection

1. controls how much sugar is in the blood pancreas 2. controls the other glands pituitary gland 3. manufactured by the brain to relieve pain thyroid 4. gland that regulates the body's energy levels endorphins