Question

Which parts of the human body contain the ring-like muscles called sphincters?

a) Anus and urinary tract
b) Mouth and eye
c) Stomach
d) All of the above​

Answer 1

Answer:

Pretty sure its D

Explanation:

We all know that the anus has 2 sphincters. One is made out of smooth muscle, and naturally contracts when you are on the toilet. The other one is manual and I can bet you've used it before! :)

The lower esophageal sphincter regulates the amount of food that enters your stomach.

If you eat tacos or something, you will excite the hydrochloric acid in your stomach and it's not going to be pretty for that valve, so it opens up and the gastric acid enters, making that stinging feeling.

The stomach also has a sphincter that regulates the amount of food that enters there at the time (the food has to sit there for a minute to be digested) and regulate the amount of acid that comes with it.

The eye has something called an iris. It focuses your lens depending on what you are looking at, and it is completely involuntary.

To test it out, take your eyes off the screen and move them to a far off object. The iris will analyze this, then focus appropriately.

This contributes to the blur, then refocus of the eye.

Hope this helped! If it did,

Plz mark me brainliest :)

Answer 2

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