The Great Nebula in Orion

question 32

Multiple Choice

The Great Nebula in Orion

• A) is a Herbig-Haro object.
• B) is a reflection nebula.
• C) is an emission nebula.
• D) contains only young low mass stars.
• E) is believed to be about 5 billion years old.

---

Definitions:

ACh Antagonist

An ACh antagonist is a type of drug that blocks the action of acetylcholine, a neurotransmitter, at its receptor sites, affecting the nervous system's functions.

ACh Agonist

A substance that mimics the action of acetylcholine, a neurotransmitter, thereby stimulating the parasympathetic nervous system.

Curare

A poisonous compound that comes from certain plants, traditionally used on arrow tips in South America for hunting; it blocks nerve impulses to muscles, causing paralysis.

Serotonin Agonist

A type of drug that activates serotonin receptors in the brain, mimicking the effects of serotonin to increase its action in the nervous system.