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Ch 21: AP Biology Homework Help: Musculoskeletal, Excretory, Digestive & Other Systems

About This Chapter

The Circulatory, Respiratory, Digestive, Excretory, and Musculoskeletal Systems chapter of this AP Biology Homework Help course helps students complete their circulatory, respiratory, digestive, excretory, and musculoskeletal systems homework and earn better grades. This homework help resource uses simple and fun videos that are about five minutes long.

How it works:

  • Identify which concepts are covered on your circulatory, respiratory, digestive, excretory, and musculoskeletal systems homework.
  • Find videos on those topics within this chapter.
  • Watch fun videos, pausing and reviewing as needed.
  • Complete sample problems and get instant feedback.
  • Finish your circulatory, respiratory, digestive, excretory, and musculoskeletal systems homework with ease!

Topics from your homework you'll be able to complete:

  • Functions of epithelial tissue
  • Types of connective tissue
  • The skeletal and muscular systems
  • Types of circulatory systems
  • The human vascular system
  • Heart anatomy and function
  • Red blood cell and hemoglobin functions
  • Gas exchange in the human respiratory system
  • The upper and lower gastrointestinal tracts
  • Components of the excretory system

17 Lessons in Chapter 21: AP Biology Homework Help: Musculoskeletal, Excretory, Digestive & Other Systems
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!

Skeletal System and Muscular System

3. Skeletal System and Muscular System

Do you know how many bones are in the human body? Check out this video lesson to uncover the answer, as well as understand the role and importance of the skeletal and muscular systems.

Circulatory System I: Types of Circulatory Systems

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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.

Double Circulation: Definition & Advantage

13. Double Circulation: Definition & Advantage

Humans and many other organisms use a double circulatory system. This means that we have two separate circuits for blood in our body. Learn how these circuits differ and the function of each one.

Excretion: Definition & Examples

14. Excretion: Definition & Examples

In this lesson, we'll explore the varied ways that plants, animals, and cells excrete toxic substances and metabolic wastes. We'll look at some of the specialized structures that humans and animals have to complete these necessary excretory tasks.

Food Vacuole: Definition & Function

15. Food Vacuole: Definition & Function

Vacuoles are small membrane-bound sacs inside of a cell. Food vacuoles in particular have a small role but a major responsibility inside of a cell. We will look at what they do in terms of helping cells.

Intervertebral Disc: Definition, Function & Disease

16. Intervertebral Disc: Definition, Function & Disease

Sometimes, back injuries involve the muscles, but more serious injuries often involve the intervertebral discs. In this lesson, you'll learn about the structure and function of the intervertebral discs and how injury and disease can affect them.

Animals with Closed Circulatory Systems

17. Animals with Closed Circulatory Systems

In this lesson, you will explore the closed circulatory system. We'll learn about the advantages and disadvantages of this system, and we'll look at examples of animals that have closed circulatory systems.

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

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