Grade by Grade
B. Life Systems · Human Organ Systems

When Body Systems Need Help: Diseases and Disorders

B2.4 A1.1 A3.3About 45 minutes
Learning goals
  • I can name some diseases and disorders and the organs or systems they affect.
  • I can tell the difference between diseases that spread and ones that don't.
  • I can research a disease or disorder using reliable sources.
  • I can describe contributions to health from different people and communities, including Canadians and Indigenous peoples.

Words to know

disease
An illness that stops part of the body from working properly.
disorder
A condition where part of the body does not work in the usual way.
infectious
Caused by germs (such as viruses or bacteria) and able to spread from person to person. Also called contagious.
non-infectious
Not caused by germs, so it can't be caught from someone else.
chronic
Lasting a long time, often for life.
insulin
A substance made by the pancreas that lets the body's cells use sugar from the blood.
reliable source
Information you can trust, from experts such as hospitals, health agencies or scientists.

When something goes wrong

A bike is made of parts that work together. If the chain breaks, the bike won't go, even if the wheels are perfect. In the body, when one organ doesn't work well, the whole system, and often other systems too, can be affected. Doctors and scientists study diseases and disorders to learn how to prevent and treat them.

Many people live full, active lives with these conditions. Someone in your class or family might have one. Learning about them helps us understand and support each other.

Infectious or not?

  • Infectious (contagious) diseases are caused by germs such as viruses and bacteria. They can spread from person to person. Examples: colds, flu, strep throat. Washing hands, covering coughs and vaccines help stop them.
  • Non-infectious diseases and disorders are not caused by germs. You can't catch them from someone. Examples: asthma, diabetes, celiac disease. Some are linked to genes passed down in families, some to injuries, some to the environment or habits, and for some the cause isn't fully known.
INFECTIOUSNON-INFECTIOUSgermcaused by germs; can spreadcolds, flu, strep throatHelp stop them: wash hands,cover coughs, vaccinesnot caused by germs;you can't catch themasthma, diabetes,celiac disease
Infectious diseases are caused by germs and can spread from person to person. Non-infectious ones are not caused by germs, so you can't catch them from someone.
Disease or disorderSystem and organ(s) affectedWhat happens
asthmarespiratory: airways in the lungsairways get swollen and narrow, making it hard to breathe; inhaler medicine helps
pneumoniarespiratory: lungsan infection makes the air sacs fill with fluid
high blood pressurecirculatory: heart and arteriesblood pushes too hard on the artery walls; the heart works harder
anemiacirculatory: bloodnot enough healthy red blood cells, so less oxygen is carried; a person feels tired
celiac diseasedigestive: small intestineeating gluten (in wheat, barley, rye) damages the lining of the small intestine
lactose intolerancedigestive: small intestinehard to digest the natural sugar in milk; can cause stomach aches
kidney diseaseexcretory: kidneyskidneys can't filter blood well, so wastes build up
kidney stonesexcretory: kidneyshard, pebble-like bits form in the kidney and can be very painful
concussionnervous: brainan injury to the brain from a hit or a hard jolt
epilepsynervous: brainbursts of unusual electrical signals in the brain cause seizures
fracture (broken bone)musculoskeletal: bonesa bone cracks or breaks; it can heal with a cast
scoliosismusculoskeletal: spinethe spine curves to the side
type 1 diabetesthe pancreas; affects blood and many organsthe pancreas makes little or no insulin, so sugar builds up in the blood
Some diseases and disorders and the systems they affect.

One condition, many systems

Because the systems are connected, a problem in one place can affect many others. In diabetes, the body can't make enough insulin or can't use it well. Sugar builds up in the blood. Over many years, high blood sugar can harm the heart and blood vessels, the kidneys, the eyes and the nerves. That's why people with diabetes check their blood sugar and work with their health team to keep it in a healthy range.

pancreas: little orno insulinsugar builds up in the bloodheart and blood vesselskidneyseyesnerves
In diabetes, a problem with insulin from the pancreas lets sugar build up in the blood. Over many years, that can affect many systems.

Contributions to health

Insulin, a Canadian discovery. In 1921 and 1922, a team at the University of Toronto, including Frederick Banting and Charles Best, with J.J.R. Macleod and James Collip, found a way to use insulin to treat diabetes. Before then, type 1 diabetes was deadly. Today, millions of people around the world use insulin.

Knowledge of medicines from Indigenous peoples. First Nations, Métis and Inuit peoples have deep knowledge of plants and healing that has been passed down for many generations, and they continue to use and share it today. In the winter of 1535 to 1536, French explorer Jacques Cartier's crew were very sick with scurvy, a disease caused by a lack of vitamin C. The St. Lawrence Iroquoian people at Stadacona (near present-day Québec City) showed them how to make a drink from the needles and bark of a tree they called annedda, and the sick men who drank it recovered.

Many people contribute to health: doctors, nurses, researchers, Elders and Knowledge Keepers, and families who care for each other.

Worked example

Let's research a disorder

Noor wants to research asthma. How can she use a research process?

  1. Ask a question: What is asthma, which organs does it affect, and how do people manage it?
  2. Find reliable sources: a children's hospital website (such as SickKids' AboutKidsHealth), the Government of Canada health pages, a library book. She avoids random posts and ads.
  3. Take notes in her own words: asthma affects the airways in the lungs (respiratory system). Triggers can include cold air, smoke, pollen, dust and exercise. People use inhalers and an asthma action plan.
  4. Check: does more than one reliable source say the same thing? Yes.
  5. List sources: she writes the title and website of each source.
  6. Share: she makes a poster with a labelled diagram of the lungs.

Question → reliable sources → notes in your own words → check → list sources → share.

Just for fun

Why did the library book go to the doctor?

It was worried about its appendix! (Many books have an appendix too: an extra section at the back with more information. Great for research!)

Hands-on activity

Health research poster

You need: paper or a poster board, markers, and a grown-up to help you find websites or library books.

  1. Choose one disease or disorder from the table (or one your family knows about, if they're comfortable sharing).
  2. Find two reliable sources.
  3. Answer: Which system and organs are affected? What happens in the body? Is it infectious? How is it treated or managed? Which other systems might it affect?
  4. Draw a simple labelled diagram showing the organ(s) in the right place in the body.
  5. List your sources at the bottom.
  6. Present your poster to your family in 2 minutes.

Grown-up note: guide your child to trustworthy sites (children's hospitals, Government of Canada, Health Canada). Talk about the disease with sensitivity, especially if it affects someone you know.

Your turn

1

What is the difference between an infectious and a non-infectious disease?

2

Which system does asthma affect?

3

Which organ is damaged in celiac disease?

4

Which organ does not make enough insulin in type 1 diabetes?

5

A concussion is an injury to which organ?

6

Name the Canadian city where insulin was first used to treat diabetes.

More practice: warm-up

1

Can you catch asthma from a friend?

2

Name one infectious disease.

3

Which system do kidney stones affect?

4

What is a fracture?

5

Name one way to stop germs from spreading.

More practice: on your own

1

Why can diabetes affect the heart, kidneys and eyes?

2

Why does anemia make a person feel tired?

3

Is a random video comment a reliable source? Explain.

4

Kidney disease can make wastes build up in the blood. Which two systems are involved?

5

What disease did the St. Lawrence Iroquoian people help Cartier's crew recover from, and what caused it?

Challenge

1

A classmate has epilepsy. Write two respectful facts you could share with someone who is worried about "catching" it.

2

Explain how the discovery of insulin connects science and teamwork.

3

Asthma triggers include cold air and smoke. Which other system might be affected during a bad asthma attack, and why?

Check your understanding

Quiz

1.

Which disease affects the respiratory system?

2.

A disease that can spread from person to person is called...

3.

In type 1 diabetes, which organ makes little or no insulin?

4.

Insulin was first used to treat diabetes by a team at...

5.

Which is the most reliable source about a disease?

6.

Which system does a concussion affect?

For parents and teachers

Big idea: diseases and disorders affect particular organs and systems, and often other systems too. Some are infectious; many are not.

How to help at home:

  • Help your child find reliable sources (children's hospitals such as SickKids' AboutKidsHealth, Government of Canada health pages).
  • Talk about any conditions in your family only as much as everyone is comfortable with.

Common difficulties:

  • Believing all diseases are contagious. Reassure your child that asthma, diabetes, epilepsy and celiac disease can't be caught.
  • Stigma: steer away from jokes about conditions; focus on understanding and support.

Sensitive topic: if your child has a medical condition, let them decide how much to share in any presentation.