All of the following are common types of pain stimuli except a. visual b. mechanical c. chemical d. thermal

The answer is A). Visual 

Answer: Option A visual

Explanation:

Pain is stimulated via the pain receptors which are present everywhere in the body.The stimulation perceived by the pain receptors is transferred to the brain by specialised nerves via the spinal cord.These pain receptors are nothing but free nerve endings and there are mainly three types of pain receptor stimuli:

1. Mechanical - A mechanical stimulus is perceived by actions such as stretching or application of high pressure.

2. Thermal - A thermal pain stimulus is generated due to temperature changes such as extreme heat or cold.

3. Chemical - A chemical pain stimulus is generated by chemicals such as acids which are applied eternally or by chemicals produced inside the body such as serotonins, bradykinin etc.

As, the pain stimuli are only of three types - mechanical, chemical and thermal, we can conclude that there is no visual stimuli for pain.

Science27 of the most iconic, jaw-dropping photos of the earth and the moon from spacedave mosher  oct 1, 2018, 11: 13 am etnasa/flickrapollo 11 astronauts took this photo of earth on july 20, 1969.from the ground, earth looks like a boundless fertile plain that beckons to be explored and exploited.but astronauts would beg -  and even plead  - to differ."you realize that people often say, 'i hope to go to heaven when i die,'" jim lovell, an astronaut who flew on the apollo 8 and apollo 13 missions to the moon, previously  told business insider. "in reality, if you think about it, you go to heaven when you're born."lovell has seen first-hand that we live on a tiny rock hopelessly lost in the void. he's also quick to tell you it's the only one we've got - a  fragile spaceship  for more than 7 billion people: "you arrive on a planet that has the proper mass, has the gravity to contain water and an atmosphere, which are the very essentials for life. and you arrive on this planet that's orbiting a star just at the right distance - not too far to be too cold, or too close to be too hot - and just at the right distance to absorb that star's energy and then, with that energy, cause life to evolve here in the first place. in reality, you know, god has really given us a stage, just looking at where we were around the moon, a stage on which we perform. and how that play turns out is up to us, i guess."humanity has recorded photos of earth from hundreds, thousands, millions, and even billions of miles away, some of them taken by lovell himself.these images not only scientists study our dynamic world, but also understand how a habitable planet looks from afar, which aids the search for  more worlds. most importantly, however, the images underscore our peculiar existence on  a mote of cosmic dust.take a moment to ponder 27 of the most arresting images of earth that humankind has ever captured from space.a