Scope & Sequence
Library
Pricing
Pilot

Login
Try a Unit

Interactions of Body Systems

Unit Overview

Lesson 1 : Phenomenon

Language: English
Student guide
- English
- Spanish
Lesson plan (Phenomenon)

Step 1The Phenomenon
Step 2Organs
Step 3Levels of Organization
Step 4Your Challenge
Step 5Reflect
Step 6Engineering Solutions
Step 7Constructing an Explanation

Set "Interactions of Body Systems" as your free unit

✓Aligned to your selected curriculum

No more hunting for resources. Grab the mystery hook, student labs, and assessments all in one place. Teach it end-to-end or pick your favorite lesson.

5 lessons
Hook
Lab
Assessment
Engineering
Answer keys

Get Interactions of Body Systems →

Your free unit—yours to teach in full, for 30 days.

Already have an account? Log in

The Respiratory System

LungsBody System

Respiratory

Key Function in Body

We use our lungs to breathe. The lungs bring oxygen into the body and get rid of carbon dioxide from the body.

Fun Fact

If the lungs were stretched out, they would become the size of half a tennis court!

Percent of Patients waiting for Organ Donations

1%

The Circulatory System

HeartBody System

Circulatory

Key Function in Body

The heart pumps blood throughout the body. This blood carries essential nutrients and oxygen to the body and gets rid of any cellular waste.

Fun Fact

About ⅔ of the heart is found on the left side of the body.

Percent of Patients waiting for Organ Donations

3.3%

The Urinary System

KidneyBody System

Urinary

Key Function in Body

The kidneys act as filters, removing waste and extra water from the blood. This helps keep the proper balance of minerals, water, and salts in the blood. The kidneys also help control blood pressure, make red blood cells, and keep bones healthy and strong. The waste filtered by the kidneys is converted to urine, which we get rid of (excrete) when we go to the bathroom. About one third of blood flowing from the heart is filtered by the kidneys before it enters other body tissues. While humans have two kidneys, we can survive with only one.

Fun Fact

People can live with only one kidney. However, if both kidneys stop working - people can die within a few days.

Percent of Patients waiting for Organ Donations

84.5%

The Digestive System

LiverBody System

Digestive

Key Function in Body

The liver has many functions. It stores and releases vitamins and carbohydrates into the blood when the body needs them. The liver also removes bacteria from the bloodstream, which helps keep the body healthy. The liver is extremely important and a person can die quickly from a lack of energy and nutrients if the liver stops functioning.

Fun Fact

The liver is the second largest organ in the body; only the skin is larger! The liver has regenerative properties and can regrow dead or damaged tissues.

Percent of Patients waiting for Organ Donations

11%

Mosa Mack Month · May 2026

The Vault is Open: 31 Days of Everything.

May is officially Mosa Mack Month. We're giving you unlimited, free access to every mystery, lab, and engineering challenge in our library for the next 30 days.

Aligned to Your Curriculum

Unlock all units → No credit card. No limits. Just pure science.

May 2026

31

days free

Build a bridge that holds the load.

Mystery · Life Science

What is causing the kelp to disappear?

Grade 645 minNGSS

✦✦

Vault

OPEN

May only

Documentary-quality phenomena

Story-based Labs

State-Science Practice Sets

Mosa Mack Science

It looks like you don't have a Mosa Mack account.

Create a free account