Page 27 - Ebook Digestive System Grade XI

Primary teeth Permanent teeth

Tooth P C 1 1 C P Tooth M P C 1 1 C P M FUN FACT FUN FACT
type type Most adults Most adults

have four
have four
Upper 2 1 2 2 1 2 Upper 3 2 1 2 2 1 2 3 wisdom teeth. wisdom teeth.
Jaw Jaw
But the fact is, But the fact is,
Lower 2 1 2 2 1 2 Lower 3 2 1 2 2 1 2 3 everyone can everyone can
Jaw Jaw have six have six
wisdom teeth wisdom teeth

2. Esophagus
When you eat, the food chewed in the mouth will be passed on to the stomach
organ to pass through the next stage of digestion. This process involves the
digestive tract called the esophagus.
The esophagus is a muscular tube that connects the throat to the stomach. The
esophagus is about 20 centimeters long and is lined with Mucous, moist pink
tissue. The esophagus is directly behind (trachea) and the heart and in front of the
spine. In the esophagus, peristalsis occurs; this movement helps propel Food from
the oral cavity to the stomach for about 6 seconds.

Figure 10. Anatomy of esophagus

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