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Chapter 24 Vocabu

Science Vocabulary Chapter 24

the outer layer of skin, has dead cells at the surface and living cells underneath, and it contains nerve endings such as pain receptors epidermis
inner layer of skin, the thinker layer of skin, it contains many blood vessels,nerve receptors & hair follicles, also sweat glands, oil glands & wax glands dermis
is below the dermis, is not really a part of the skin. consists of loosely arranged fat cells and fibers subcutaneous layer
a dark pigment, causes much of the color of human skin (humans have different amounts of this) melanin
an area of skin with thickened epidermis ________ often form on your feet when you go barefoot or where skin is exposed to rubbing or pressure callus
form when skin is exposed to excessive friction or intense heat, that causes skin to separate blister
marrow cavities and the spaces in spongy bone are filled with this bone marrow
are tough, flexible bands of connective tissue that attach bones to other bones at joints ligaments
bands of connective tissue that connect muscles to bones tendons
tissue consists of living bone cells and the nonliving material they secrete bone
a blood vessel and the layers of nonliving material around it make up this. Hard, strong bone sections consist of many of these side by side osteon
tissue is softer and more flexible than bone b/c its nonliving material contains very little calcium and phosphorus. Blood vessels never pass through this. cartilage
a place where 2 or more bones meet. The bones of most of these are held together by ligaments. joint
muscles that you can control at will voluntary muscles
muscles that move your skeleton called this are voluntary muscles skeletal muscles
as the muscles contracts, the protein molecules move past each other, and the striations appear to move, striations are most obvious in the skeletal muscle, but they also appear in heart muscle. Both skeletal muscle & heart muscle maybe called this. striated muscle
muscle tissue that you cannot control example (muscles of the heart, stomach, intestines, blood vessels and other internal organs are this involuntary muscles
most involuntary muscles do not have striations and are known as this smooth muscles
the heart's muscle tissue is not smooth muscle it is called this because it is both involuntary and striated. cardiac muscle
Created by: bgpalmers