Unit D

Module 9 Introduction


Muscles support the body's skeleton and allow for voluntary movements. Muscles also allow for the many involuntary movements that support the body, such as the beating heart and the contraction of the stomach. The large amount of ATP required for muscle movement is provided by cellular respiration in the cells.

The oxygen required for cellular respiration is provided by the respiratory system, as is the expulsion of carbon dioxide as a waste product.

Image by Ryan McGuire from Pixabay

Big Ideas

This module will investigate the human muscular and respiratory systems and their role in homeostasis.

By the end of this module, you should be able to
  • explain how the respiratory system facilitates the exchange of matter with the environment
  • explain the functions of the motor system
  • describe how the body systems function together to maintain homeostasis

Key Concepts

Concepts that you should be able to explain for the end of this module are
  • structures of the respiratory system
  • mechanism of breathing
  • muscle contraction
  • types of muscle
  • benefits of exercise


Skills that you should be able to do by the end of this module are
  • interpret a spirograph
  • interpret results of an investigation on the heat production of muscles
  • identify smooth, cardiac, and striated muscle tissue under a microscope


There are three graded assessments in Module 9 followed by a Unit D Test.

  1. Unit D: Section 7 Assignment
  2. Unit D: Section 8 Assignment
  3. Unit D Summative Part 4
  4. Unit D Test

As you work through this unit and its module, you will find Self-Check questions, labs, and critical thought questions. There will be lesson goals indicated at the beginning of each lesson and then clearly identified throughout the lesson.