CK12 Life Science

called feces. Circular muscles control the anus. They relax to let the feces pass out of the body through the anus. After feces ...

Foodborne Illness Harmful bacteria can enter your digestive system in food and make you sick. This is called foodborne illness. ...

Figure 17.15: Some of the foods that commonly cause allergies are shown here. They include nuts, eggs, fish, milk, and shellfish ...

may feel “draggy” and full. Some people think they should have a bowel movement every day. This is not necessarily true. There i ...

Further Reading / Supplemental Links CK–12, High SchoolBiology,Chapter 38, Lesson 2. Carol Ballard.The Digestive System.Heinema ...

enzyme A substance, usually a protein, that speeds up chemical reactions in the body. esophagus The narrow tube that carries foo ...

Image Sources (1) HHS.http://www.health.gov/dietaryguidelines/dga2005/healthieryou/ images/img_tips_food_label.gif. Public Domai ...

(10) CK-12 Foundation. http://commons.wikimedia.org/wiki/Image:Green_peas.jpg http://commons.wikimedia.org/wiki/Image:PearPhoto. ...

Chapter 18 Cardiovascular System 18.1 Lesson 18.1: Introduction to the Cardiovascular System Lesson Objectives Identify the mai ...

Functions of the Cardiovascular System Thecardiovascular systemshown inFigure18.1is the organ system that is made up of the hear ...

Figure 18.1: The cardiovascular system moves nutrients and other substances through cells. ( 25 ) ...

Figure 18.2: Blood is collected in the heart and pumped out to the lungs, where it releases carbon dioxide and picks up oxygen b ...

oxygen. Figure 18.4: Capillaries connect arteries and veins. ( 1 ) Blood is carried back to the heart in blood vessels calledvei ...

Two Blood Circulation Systems The blood is pumped around in two large “loops” within the body. One loop moves blood around the b ...

Figure 18.7: The lymphatic system helps return fluid that leaks from the blood vessels back to the cardiovascular system. ( 5 ) ...

Removing excess fluids from body tissues. Making certain types of white blood cells. Role of the Lymphatic System in Circulati ...

have a role in the defense of the body against infection. Many of these organs are also part of the immune system. Tonsils The t ...

Thymus The thymus is found in the upper chest. Chemicals made by the thymus help the production of certain infection-fighting ce ...

Table 18.1: (continued) System Structure (organs and tissues) Function Figure 18.10: In the spleen, the white pulp makes white b ...

Lymph tissues include lymph nodes, lymph ducts, and lymph vessels. Organs of the lymphatic system include the tonsils, thymus, ...