What is a sebaceous gland and what is its function?

What is the name of the device that is used to treat sleep apnea? A possible explanation or answer to a question that can be tested? Can you catch herpes from eczema? What if your born with small eyes what does it mean? What cuases enlarged prostate? What Applied aspect of opthalmic nerve? What are two tubes that branch off of the trachea and carry air into the lungs? How do diastolic and systolic phases of the heart differ? Are there any free online counseling services for adults? Why is blood transfusion dangerous if the blood groups don't match? Where were the body heat activated orthodontic wires developed? Can PCOS lead to an ovarian tumor? Can the brain be retrained to do things a person never did before? What is Lupus that affects the skin and is it autoimmue or connective tissue disease? Is osteoporosis commonly caused by obesity? How are the biceps and the bones of the arm related? What is herpes encephalitis? Why it is important to give early defibrillation? What type of channels that are present within the varicosities of autonomic neurons are absent from the axon terminal of other neurons? What is a fermur?