Greg has a hard time breathing. Which of the following could be a cause of his trouble breathing?
1) Greg has overactive sympathetic neurons innervating the smooth muscle of his bronchioles which lowers the resistance of his airways.
2) Greg has taken a sympathomimetic which overstimulates the nicotinic cholinergic receptors on his motor end plate to continuously contract his diaphragm and internal intercostals during inspiration.
3) Greg's has a functioning adenoma on his parathyroid gland which decreases the amount