CK12 Life Science

epidermis The outermost layer of the skin; forms the waterproof, protective wrap over the body’s surface; made up of many layers ...

Check Your Understanding What is an organ system? What is connective tissue? Introduction How important is your skeleton? Can ...

Figure 16.12: The skeletal system is made up of bones, cartilage, and ligaments. The skeletal system has many important function ...

ProtectionThe skeleton provides a framework that supports and protects the soft organs of the body. For example, the skull surr ...

Figure 16.13: Bones are made up of different types of tissues. ( 12 ) ...

areas, calledgrowth plates, allow the bones to grow longer as the child grows. When the child reaches an age of about 18 to 25 y ...

Figure 16.15: The joints between your vertebrae (b) are partially movable. ( 1 ) ...

between the bones in a movable joint is filled with a liquid calledsynovial fluid. Synovial fluid is a thick, stringy fluid that ...

Figure16.17: Thekneejointisahingejoint. Likeadoorhinge, ahingejointallowsbackward and forward movement. ( 25 ) Figure 16.18: Piv ...

regularlybydoingaweight-bearingactivity, bonesrespondbyaddingmorebonecellsmaking the bones denser. Eating Well Did you know that ...

like a filter that can prevent the skin from making vitamin D. As a result, people with darker skin need more time in the sun th ...

Figure 16.20: Rickets is a softening of the bones in children that may cause fractures and bending of the bones, especially of t ...

Figure 16.21: The upper part of the ulna, at the elbow is broken, as you can see in the X-ray at left. The x-ray at right was ta ...

Stretchingafteractivitymayhelppreventinjuries. Regularstretchingimprovestheflexibility of muscles and tendons. It also improves ...

Name two things you can do to keep your skeletal system healthy. What part of the skeletal system does osteoarthritis affect? W ...

movable joint Most mobile type of joint; the most common type of joint in the body. osteoarthritis A condition in which the cart ...

Check Your Understanding What is muscle tissue? What is the function of the muscular system? Introduction Themuscular systemis ...

Figure 16.22: There are three types of muscles in the body: cardiac, skeletal, and smooth. Everyone has the same three types of ...

Figure 16.23: The biceps and triceps act against one another to bend and straighten the elbow joint. To bend the elbow, the bice ...

For example, you cannot make your heart muscle stop beating. Likewise, you cannot make food stop moving through your intestines. ...