Jada Bascom Foundation
2
20-25 minutes

Blood as a Team

Meet the different types of blood cells and discover how each one has a special job to keep you healthy.

Learning Objective

Students will identify the four main components of blood (red blood cells, white blood cells, platelets, and plasma) and describe their functions.

Materials

  • Chart paper divided into 4 sections
  • Red, white, yellow markers/crayons and small objects for activity
  • Index cards for matching game (optional)

Lesson Content

Introduction: Blood Is a Team (3 min)

  • "Last time we learned about the circulatory system—the highways in your body."
  • "Today we're going to look at what's actually traveling on those highways."
  • "Blood isn't just one thing—it's actually a TEAM of different parts, each with its own job!"

Meet the Team Members (12-15 min)

Red Blood Cells - The Delivery Trucks

  • "Red blood cells pick up oxygen in your lungs and deliver it everywhere."
  • "They're shaped like tiny donuts (without the hole going all the way through)."
  • "There are about 25 TRILLION red blood cells in your body right now (Source: NIH NHLBI)."
  • "They're what makes blood look red."

White Blood Cells - The Soldiers

  • "White blood cells are your body's defense team—like tiny soldiers."
  • "When germs get into your body, white blood cells find them and fight them off."
  • "That's why when you're sick, your body is working hard—your white blood cells are battling!"

Platelets - The Repair Crew

  • "Platelets are tiny cell pieces that help fix problems."
  • "When you get a small cut, platelets rush to the spot and stick together."
  • "They form a plug (called a clot) that stops the bleeding and lets your skin heal."

Plasma - The River

  • "Plasma is the liquid part of blood—it's actually yellowish!"
  • "Think of it as the river that carries all the other parts."
  • "It also carries nutrients, hormones, and other important things your body needs."
  • "About 55% of your blood is plasma (Source: NIH NHLBI)."

Closing (3 min)

  • "So blood is really a team: delivery trucks (red cells), soldiers (white cells), repair crew (platelets), all floating in a river (plasma)."
  • "Next time, we'll learn about where all these team members come from!"

Activity: Blood Team Poster

Instructions:

  1. In small groups, create a poster showing the "Blood Team"
  2. Draw and label each component: Red Blood Cells, White Blood Cells, Platelets, Plasma
  3. Write one sentence about each team member's job
  4. Share posters with the class
Red Blood Cells
Cells that carry oxygen from your lungs to the rest of your body and are shaped like tiny donuts.
White Blood Cells
Cells that fight germs and infections to keep you healthy—like tiny soldiers.
Platelets
Tiny cell pieces that help your blood clot and stop bleeding when you get a cut.
Plasma
The yellow liquid part of blood that carries the cells, nutrients, and other important things.
Oxygen
A gas in the air that our bodies need to survive. Red blood cells carry it around.

Discussion Questions

  • Which blood team member do you think has the hardest job? Why?
  • What might happen if one of the team members wasn't doing its job?
  • Why do you think it's important that blood has different parts working together?

Optional Extension

Create a "Blood Team" matching game with cards showing each component and its function. Students can play in pairs to reinforce learning.

Sources