Unit 3 Lesson 5 How Do Our Bodies Digest Food, … · Unit 3 Lesson 5 How Do Our Bodies Digest Food, Remove Wastes, and Send Messages? Food for Thought Copyright © Houghton Mifflin

Unit 3 Lesson 5 How Do Our Bodies Digest Food,

Remove Wastes, and Send Messages?

Copyright © Houghton Mifflin Harcourt Publishing Company

How do our bodies digest food, remove wastes and send messages ?


Unit 3 Lesson 5 How Do Our Bodies Digest Food, Remove Wastes, and Send Messages?

Let’s think together? • Why do we need food? •How could food reach all our body parts? •What system is responsible for that process? •This system is made up of a group of __________ .



What Goes In...


• Food travels through your body until all the useful parts are absorbed.

• Food travels down the esophagus, a long tube that begins in the throat.

• The stomach is a muscular

bag that mashes food into a liquid and mixes it with digestive juices. The food then passes to the small intestine.


Digestive System.flv

What Goes In...


• The small intestine is a long coiled tube that digests food and absorbs nutrients.

• In the large intestine,

water and minerals are soaked up, leaving only waste. Solid waste passes out of your body.


What Goes In...


• Identify the esophagus, stomach, small intestine, and large intestine in the image below.




Exit slips:


• Q1-

• Q2-


Exit slips:


• Q3-

• Q4-


Q5 :



What Goes In...


• The liver makes bile that helps break large blobs of fat into tiny droplets so the fats can be broken down more easily.

• The pancreas makes juices that

are released into the small intestine to break down fats and proteins to be absorbed by the body.

• The gallbladder stores bile from the liver and sends it to the small intestine only when food passes through.


Role of liver and pancreas in digestion of food - DnaTube.com - Scientific Video and Animation Site.flv

Food for Thought


• Nutrition information on a package label can help you make healthy food choices.

• The number of servings,

calories, proteins, carbohydrates, fats, and nutrients and their daily recommended amounts are listed on the label.

• Calories are a way to measure

how much energy your body will get from food.


...Must Come Out


• The excretory system rids the body of waste and keeps water and salt levels in balance.

• When nutrients are broken

down, waste products are made.

• The liver converts ammonia,

which is very toxic, to urea, which is less toxic. Your body releases this as urine.


What are the parts of the EXCRETORY SYTSEM?


1-The lungs: • The lungs are part of the

excretory system. • Your body produces carbon

dioxide as a waste.(after food is burned)

• Carbon dioxide is released by

your lungs when you breathe out. (exhale)



• 2- The skin: • The skin helps you get rid of the excess salts and water in

sweat.



• The urinary system filters the blood and rids the body of wastes as urine.

• The urinary system is

formed of: -Kidneys - ureters - bladder - urethra


3- The Urinary system:

Excretory System.mp4


• Urine collects in tubes called ureters that move the urine to the bladder.

• The bladder stores urine until is released.

• The urethra is a small tube

that moves urine from the bladder to outside of the body.


• The kidneys are organs that remove (filter) waste from the blood and help to conserve water and keep the amount of salt in the blood balanced.

Q6: CW 1



Word bank:

Bladder- ureters – urethra - kidneys



Q7: CW 1



Q: Q1 CW:2

Chemical Messages


• Hormones are chemicals that carry messages through the body that result in growth and different changes.

• Groups of cells called glands produce hormones. Glands and hormones make up the endocrine system.


Endocrine System- Human Body Systems for Kids.mp4


• The pituitary gland, located

underneath the brain, produces hormones that tell other glands what to do. It also releases growth hormones.( Master gland)

• The thyroid produces a hormone

that goes up when you need energy and goes down when you have enough energy.


Q3: CW 2




• The adrenal gland, located

above each kidney, produces a hormone called adrenalin that helps the body to defend itself. (How?)

• The pancreas produces a

hormone that controls sugar in your blood.

• When the amount of sugar is high, the hormone insulin is released. When your blood sugar is low, the pancreas stops releasing insulin.


Q4: CW 2



Q2 CW 2



• body prepares to

defend itself.

•Body grows.

•Body use of energy

Q5 CW 2



• Large intestine

•Esophagus

•Stomach

•Gland

•Digestive

•Bladder

•Pancreas

•Liver

•Urinary

•Kidney

•Thyroid

•Endocrine





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Unit 3 Lesson 5 How Do Our Bodies Digest Food, … · Unit 3 Lesson 5 How Do Our Bodies Digest Food, Remove Wastes, and Send Messages? Food for Thought Copyright © Houghton Mifflin