1. Jan. 25, 2018
You need:
Clean paper / Pencil
Station work
HW question
Warm Up: (Mental Math)
I CAN: determine the parts/function of the digestive system.

2. MRS NERG-C M - Movement R – Respirations
S – Sensitivity (responds to stimulus)
N – Nutrition / nutrients
E - Excretion
R – Reproduces
G - Growth
C - Cells

3. Body Organization
Organism
Organ System
Organ
Tissue
Cell

4. How are cells organized?
ORGANISM (BODY)
Complex living things are organized into 5 levels.
Cells carry on the processes that keep us alive.
Examples:
Red Blood Cells
Muscle Cells
Skin Cells
ORGAN SYSTEM
ORGANS
TISSUES
CELLS

5. Organs are organized into ORGAN SYSTEMS!
An ORGAN SYSTEM is a group of organs that work together to perform a major job.
Examples:
Circulatory System
Digestive System
Skeletal System
ORGAN SYSTEM
ORGANS
TISSUES
CELLS

6. What is HOMEOSTASIS?
HOMEOSTASIS is how your body maintains an INTERNAL BALANCE.
It keeps your body STABLE in spite of changes OUTSIDE YOUR BODY.

7. The Digestive System Mouth Esophagus Stomach Liver Rectum Pancreas
Gallbladder
Small intestine
Large intestine
Rectum
Pancreas

8. The Digestive System The digestive system has 3 main functions:
It breaks down food into particles that the body can use.
It absorbs nutrients into the blood.
It eliminates waste from the body.
Mouth
Esophagus

9. The Digestive System
Digestion can happen in two ways:
Mechanical digestion: foods are physically broken down into smaller parts (like by teeth).
Chemical digestion: Chemicals called ENZYMES break foods into their smaller “building blocks” (for example, starch gets broken down into sugar).
Mouth
Esophagus

10. The Digestive System
MOUTH: your teeth break down food into smaller pieces (mechanical digestion). Saliva has enzymes that start chemical digestion.
ESOPHAGUS: smooth muscles push food down to the stomach (peristalsis).
Mouth
Esophagus

11. The Digestive System Most digestion happens in the Stomach:
Mechanical digestion occurs when the stomach muscles churn the food.
Chemical digestion happens when stomach acid breaks down food.
Mouth
Esophagus
Stomach

12. The Digestive System
Liver, gallbladder and pancreas: produces & stores chemicals (enzymes) that help digest food in the small intestine.
Mouth
Esophagus
Stomach
Liver
Gallbladder
Pancreas

13. The Digestive System
Small intestine: completes chemical digestion and absorbs nutrients for the body. The nutrients pass through the villi into blood vessels.
Large intestine: water is reabsorbed by the body.
Rectum: compresses waste into a solid form.
Mouth
Esophagus
Liver
Stomach
Gallbladder
Pancreas
Small intestine
Large intestine
Rectum

14. Extra LISTEN – schoolhouse rock
WATCH -

15. Are there any questions?