CK-12 Foundation
Ck 12: Blood
[Free Registration/Login may be required to access all resource tools.] In this interactive tutorial students will learn to explain how the heart pumps blood throughout the body. Students will explain the composition of blood and will...
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Ck 12: Respiration
[Free Registration/Login may be required to access all resource tools.] In the following learning module students will begin tol define respiration, and explain how it differs from cellular respiration.
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Ck 12: Respiratory System Organs
[Free Registration/Login may be required to access all resource tools.] In the following online tutorial students will identify the organs of the respiratory system.
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Ck 12: Processes of Breathing
[Free Registration/Login may be required to access all resource tools.] In the following online lesson students will explain the processes of ventilation, gas exchange, and gas transport. Students will describe the role of gas exchange...
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Ck 12: Respiratory System Regulation
[Free Registration/Login may be required to access all resource tools.] In the following online lesson students will explain how the rate of breathing is regulated.
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Ck 12: Respiratory System Diseases
[Free Registration/Login may be required to access all resource tools.] In this online lesson students will identify diseases of the respiratory system.
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Ck 12: Digestive System Organs
[Free Registration/Login may be required to access all resource tools.] In the following online lesson students will identify the organs and functions of the digestive system.
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Ck 12: Digestion
[Free Registration/Login may be required to access all resource tools.] In the following online tutorial students will explain the roles of the mouth, esophagus, and stomach during digestion.
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Ck 12: The Small Intestine
[Free Registration/Login may be required to access all resource tools.] In the following online tutorial students will explain how digestion and absorption occur in the small intestine.
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Ck 12: Large Intestine
[Free Registration/Login may be required to access all resource tools.] Liquid to solid. What does this mean? Well, that's exactly what the large intestine does. It takes the remains of digested food - that is, food in which all the...
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Ck 12: Digestive System Diseases
[Free Registration/Login may be required to access all resource tools.] You've probably had an upset stomach. Most likely it was due to something you ate. But imagine bleeding from your stomach. That's a little different than your...
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Ck 12: Excretion
[Free Registration/Login may be required to access all resource tools.] Toxic waste must be disposed of properly or there can be serious consequences. It is the same with your body--your waste needs to be removed from you. And that is...
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Ck 12: Urinary System
[Free Registration/Login may be required to access all resource tools.] In this interactive tutorial students will explain how the urinary system filters blood and excretes wastes.
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Ck 12: Kidneys
[Free Registration/Login may be required to access all resource tools.] Why are your kidneys so important? Find out in this online tutorial. You will learn to describe the roles of the kidneys in homeostasis.
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Ck 12: Inflammatory Response and Leukocytes
[Free Registration/Login may be required to access all resource tools.] Whenever the skin is broken, it is possible for pathogens to easily enter your body. They get past the first line of defense, and run into the second line of...
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Ck 12: The Lymphatic System
[Free Registration/Login may be required to access all resource tools.] Almost all of us have had a sore throat at some time. Maybe you had your tonsils out when you were younger? Why? Your tonsils are two lumps of tissue that work as...
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Ck 12: Humoral Immune Response
[Free Registration/Login may be required to access all resource tools.] In the following tutorial students will describe the steps that occur in a humoral immune response.
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Ck 12: Cell Mediated Immune Response
[Free Registration/Login may be required to access all resource tools.] Do cells really attack other cells? They sure do. When they can, the T cells search out and destroy "bad" cells. In the following tutorial students will identify the...
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Ck 12: Autoimmune Diseases
[Free Registration/Login may be required to access all resource tools.] Joint pain. Not an uncommon problem as you grow older. Is it due to normal wear and tear on the joints? Possibly. But rheumatoid arthritis is an autoimmune disease,...
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Ck 12: What Is Chemistry?
[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will define chemistry and differentiate between the macroscopic and the microscopic as it relates to chemistry. They will begin to...
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Ck 12: The International System of Units
[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will begin to identify the seven base units of the International System of Units. They will understand the commonly used metric...
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Ck 12: Scientific Method
[Free Registration/Login may be required to access all resource tools.] Describe how the Renaissance period in history changed the approach to science. Identify the steps of the scientific method. Differentiate between the independent...
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Ck 12: Unit Conversions
[Free Registration/Login may be required to access all resource tools.] In this online tutorial students will begin to identify and use conversion factors and to also use the method of dimensional analysis to convert between units....
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Ck 12: Concepts, Classification and States of Matter
[Free Registration/Login may be required to access all resource tools.] Freshly baked bread and cherry pie are two delicious parts of any meal. What happens to the ingredients that go into the bread and the pie as they are heated in the...