Warm-up: January 19, 2011

Warm-up: January 19, 2011

Digestive System

Fact or Fiction? (7 minutes)1. It takes from about 4 to 8 seconds for food

to pass from the top of the throat to the stomach.

2. It takes less than 2 seconds for liquids to pass from the top of the throat to the stomach.

3. The small intestine is the smallest portion of the digestive tract.

Fact or Fiction?4. Unlike the small intestine, the large

intestine does not secrete digestive enzymes.

5. In short people, the stomach is high found in the abdomen and runs horizontally. In tall people, the stomach tends to run vertically, forming a J shape.

Fact or Fiction?All were Facts!Except #3. The small intestine is actually the

longest portion of the digestive tract.

Digestive SystemThe digestive system is a group of organs

that break down, or digest, food so your body can get nutrients.

The main organs of the digestive system

make one long tube through the body. This tube is called the digestive tract. The digestive tract includes the mouth, pharynx, esophagus, stomach, small intestine, and large intestine.

The digestive system has several organs that are not part of the digestive tract.

The liver, gallbladder, pancreas, and salivary glands add materials to the digestive tract to help break down food.

However, food does not go into these organs.

2 Types of Digestions1. Mechanical Digestion: Grinding, Cutting and Churning.

Example:Mouth: This is when your teeth grinds the food.Stomach; This is when your stomach churns the food.

2. Chemical Digestion: Anything that has something to do with saliva, enzymes, and chemicals.

Example:Mouth: This is when saliva breaks down the foodStomach: This is the moment when gastric juices break down the food, food is now called chyme.

Digestive SystemIt takes about 24 hours for food to make the

trip from your mouth to the end of the large intestine.

You can help keep your digestive system healthy by eating whole grains, fruits, and vegetables.

Urinary System

Urinary System

Excretion

Your urinary system plays a specific role in helping your body during excretion.

The process of removing waste from the body.

Urinary System

Kidneys

The urinary system also assists the body in cleaning the blood.

A pair of organs that constantly clean the blood.

Urinary System

Nephrons

Each kidney contains more than 1 million nephrons!

Microscopic filters in the kidney that remove waste from the blood.

Check for UnderstandingHow are the kidneys and nephrons related?

Urinary System ProblemsBacterial Infections

Bacteria can get into the bladder and ureters through the urethra and cause painful infections.

Urinary System ProblemsKidney Stones

Salts and other waste collect inside the kidney and interfere with urine flow.