Ch 42: Circulatory, Respiratory & Digestive Systems - ORELA Middle Grades General Science

About This Chapter

Refresh your understanding of the circulatory, respiratory and digestive systems by exploring the short videos and text lessons in this chapter. Afterwards, self-assessment quizzes can gauge your readiness to take the ORELA Middle Grades General Science assessment.

Circulatory, Respiratory & Digestive Systems - ORELA Middle Grades General Science - Chapter Summary

This chapter can help you answer questions related to the circulatory, respiratory and digestive systems on the ORELA assessment. In no time, you'll have the knowledge to:

  • Discuss multicellular organisms, tissues and epithelium
  • Identify types of connective tissue
  • Explore circulatory systems and the human vascular system
  • Analyze heart, red blood cells and hemoglobin
  • Describe gas exchange in the human respiratory system
  • Exhibit understanding of upper and lower gastrointestinal tracts
  • Explain the excretory system

As you prepare for the exam, watch the lessons in whatever order works best for you. The videos and texts are available 24/7 giving you around-the-clock access to expert instruction.

Circulatory, Respiratory & Digestive Systems - ORELA Middle Grades General Science Chapter Objectives

The ORELA assessment, which has been replaced by the NES Middle Grades General Science assessment in Oregon, is taken by educators who want to secure their licensure and teach science in the middle grades classroom. This computer-based test consists of 150 multiple-choice questions and is three hours in length. Passing requires a minimum score of 228.

Topics covered in this chapter are found in life science content domain of the exam, which makes up approximately 25% of the total test. In addition to watching the engaging lessons in this chapter, you can access full transcripts with helpful vocabulary words to gain greater insight into human body systems. Short quizzes and a chapter exam are also available to gauge your comprehension of the subject area.

11 Lessons in Chapter 42: Circulatory, Respiratory & Digestive Systems - ORELA Middle Grades General Science
Test your knowledge with a 30-question chapter practice test
Multicellular Organisms, Tissues and Epithelium

1. Multicellular Organisms, Tissues and Epithelium

In this lesson on multicellular organisms, you'll take a look at what it actually means to be multicellular and how cells are organized into tissues, organs, and organ systems. This lesson also covers one of the four main tissue types: epithelial tissue.

Types of Connective Tissue

2. Types of Connective Tissue

In this lesson, you'll learn about the various types of connective tissues in the body. These tissues include bone, fat, cartilage and blood. They form the framework of the body, support organs and much, much more!

Circulatory System I: Types of Circulatory Systems

3. Circulatory System I: Types of Circulatory Systems

From cnidarians to humans, all animals need a circulatory system to absorb nutrients and get rid of waste. Find out why different kinds of animals have different systems, and see what a closed circulatory system and indoor plumbing have in common.

Circulatory System II: The Human Vascular System

4. Circulatory System II: The Human Vascular System

In this lesson, learn all about the operation of the human vascular system. What are the different types of blood vessels? How does blood flow through the human body? How does the system adapt to your body changing?

Circulatory System III: The Heart

5. Circulatory System III: The Heart

What purpose does the heart serve? And how do different types of hearts function? In this lesson, you'll learn about two, three and four-chambered hearts.

Circulatory System IV: Red Blood Cells

6. Circulatory System IV: Red Blood Cells

Why don't mature red blood cells have nuclei or mitochondria, and how do these guys squeeze through capillaries? While learning about the brief but glorious lives of red blood cells, you'll also see which characteristics help them transport oxygen and carbon dioxide to other cells.

Circulatory System V: Hemoglobin

7. Circulatory System V: Hemoglobin

Did you ever wonder how red blood cells can store enough oxygen to supply the entire human body? Join us in this lesson on hemoglobin to learn why red blood cells are so good at transporting oxygen and carbon dioxide. This lesson will make you see red (as well as blue and purple-maroon)!

Gas Exchange in the Human Respiratory System

8. Gas Exchange in the Human Respiratory System

Did you know that the average human lung has a respiratory surface area that is roughly the same size as half of a tennis court? Believe it or not, that's how much surface area an active, healthy human needs to ensure that the body gets plenty of oxygen.

Digestive System I: The Upper Gastrointestinal Tract

9. Digestive System I: The Upper Gastrointestinal Tract

Did you know that there are digestive enzymes in your saliva? It's true. As soon as you put a piece of food in your mouth, the digestive process begins. Join us with this first of two lessons about the human digestive system, where we'll follow food through the upper gastrointestinal tract from the mouth through the stomach.

Digestive System II: The Lower Gastrointestinal Tract

10. Digestive System II: The Lower Gastrointestinal Tract

The lower gastrointestinal tract is the part of the digestive system that is responsible for the last part of food digestion and the expulsion of waste from the body. In this lesson, we'll look at each part of the system and what functions each serves in the process of digestion.

Excretory System

11. Excretory System

Each year in the U.S., close to 400,000 people with kidney failure undergo dialysis treatment in order to remove waste, remove excess fluid and restore electrolyte balance. Kidneys, the workhorses of the excretory system, perform these same functions more effectively than any machine. In this lesson, we'll talk about how the excretory system removes toxic substances from the body.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
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Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
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Other Chapters

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