Why do we cry when we are sad?

Question

Why is it that when you're sad or very emotional you cry, and what is the science of tears and why we shed tears?

Answer 1

Tears brought about by emotions have a different chemical make up than those for lubrication; emotional tears contain more of the protein-based hormones prolactin, adrenocorticotropic hormone, and leucine enkephalin (a natural painkiller) than basal or reflex tears. The limbic system is involved in production of basic emotional drives, such as anger, fear, etc. The limbic system, specifically the hypothalamus, also has a degree of control over the autonomic system. The parasympathetic branch of the autonomic system controls the lacrimal glands via the neurotransmitter acetylcholine through both the nicotinic and muscarinic receptors. When these receptors are activated, the lacrimal gland is stimulated to produce tears.

Think of our tear ducts as a.... lemon. When we have strong emotions, our system tightens, and causes the lemon to squeeze. This causes the juice from the lemon to come out.

Answer 2

because it helps to to relax

1.when someone dies and we cry, it help us get over the shock

2. if u do not cry, u will remain depressed and will ot be able to get rid of the frustation