Digestive System

Technically speaking, never, as long as you hold it. There are 2 types of muscles protecting you from urinating.

1. Smooth muscle that is involuntary. Excess or certain amount of urine present in your urinary bladder relaxes this muscle involuntarily.

2. Skeletal muscle that is voluntary. You can control this hence why you can hold the urine from coming out. However, you are consistently aware of this, because it is voluntary and you're voluntarily holding it. This muscle is absent in young children, hence the "accidental" urination. As you grow older, you also acquire some control of your bladder.

Problem is, when you hold your urine or feces too long, you might get really really sick. Examples are infections and kidney failures. These leads to death, especially in the case of kidney failure.

The mouth breaks the food into small fragments which lead tot the stomach which digests its, then passes the food down to the small intestine which turns it into leftovers, or commonly known as poop. (awks)

The digestive system is a series of hollow organs joined in a long, twisting tube from the mouth to the anus. Inside this tube is a lining called the mucosa. In the mouth, stomach, and small intestine, the mucosa contains tiny glands that produce juices to help digest food.

Two solid organs, the liver and the pancreas, produce digestive juices that reach the intestine through small tubes. In addition, parts of other organ systems (for instance, nerves and blood) play a major role in the digestive system.

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When undigested waste passes too quickly through the large intestine, not enough water is absorbed resulting in Diarrhea. Likewise, when too much water is absorbed the result is constipation. We just learned this in my 8th grade Science class. : )

Digestion is accomplished by physically breaking down, or chemically breaking down foods.

The pH level must rise

it contains enzyme amylase which digests starch,and a lubricant which makes food slippery and easy to swallow

The purpose of the digestive system is to break down food to make it absorbable into the bloodstream.

The liver breaks down subtances such as Alcohol, Drugs and any other waste material so that the kidney's can remove them. The liver also destroys old red blood cells.

the digestive system breaks down large food molecules into smaller food molecules and then the cardiovascular absorbs the food and uses this material for the other parts of the body

well i think that's what it is? any help

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Dr. William Beaumont discovered gastric acids in the 1820's and is known as the "Father of Gastric Physiology". He published his book "Experiments and Observations on the Gastric Juice, and the Physiology of Digestion" in 1838.

It takes the body about 2 1/4 hours to digest some types of lettuce, such as iceberg. Some quickly digesting foods that take only 1 3/4 hours are grapes, mangoes, raspberries, and avocados.

Stomach and small intestine are the two most important. The large intestine is pretty important too since it absorbs water and nutrients so that they don't get excreted. But they are all important.

100 years

The food would be stuck in your esophagus

It is called intestinal lining. Simple.

The Digestive System is vital to the human body becasue it breaks down all of the food we eat into molecules. These molecules can then be absorbed into the bloodstream eventually to be used by the cells. The digestive system is made up of many different organs, all of which help with the process of taking the nutrients out of the food we eat, and turning it into energy for our bodies cells. Once all the nutrients has been transfered into energy and stored into the cells of the body, the undigestable food is then passed through the anus as faeces.

so your body can absorb as much nutrients as it can from the food you eat.

Functional Foods

The digestive system may be broken into two parts: a long, winding, muscular tube accompanied by accessory digestive organs and glands. That open-ended tube, known as the alimentary canal or digestive tract, is composed of various organs. These organs are, in order, the mouth, pharynx, esophagus, stomach, small intestine, and large intestine. The rectum and anus form the end of the large intestine. The accessory digestive organs and glands that help in the digestive process include the tongue, teeth, salivary glands, pancreas, liver, and gall bladder.

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Saliva breaks down your food as you chew, softening it and making it smaller. It also lubricates the esophagus.

The mouth makes the food more chewed up so that it can go down easier through the esophagus. The chemical processes in the stomach work better when the food is chewed and able to soak up the stomach acid. The mouth also secretes enzymes in the saliva to help break down starches that are in the food.

What is a fatty substance found only in animal tissues