â¢ A red blood cell circulates around your body in about 20 seconds. The same red blood cell makes tens of thousands of trips around your body, transporting oxygen to cells, before it is recycled by your own immune system. â¢ Red blood cells in humans are molecularly quite similar to chlorophyll cells in plants.
Lysergic Acid Diethylamide (LSD) Lysergic acid diethylamide (LSD), also known as acid, belongs to a class of drugs known as hallucinogens, which distort perceptions of reality. LSD is the most potent mood- and perception-altering drug known: doses as small as 30 micrograms can produce effects lasting six to 12 hours.
It's not known exactly how LSD affects the brain. Scientists believe it has to do with serotonin. Serotonin is a brain chemical that carries messages related to perception and behavior. LSD somehow disrupts that process, leading to a trip that can last for 12 hours or more. A person starts feeling high about 30 to 90 minutes after taking LSD. How the drug actually affects a person depends on many things, including the amount of LSD taken, the person's surroundings, and his or her personality and mood.