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Human Body 7th Grade

7th Grade Human Body, Life Science

TermDefinition
Striated Muscle Muscle tissue in which the contractile fibrils in the cells are aligned in parallel bundles, so that their different regions form stripes visible in a microscope. Muscles of this type are attached to the skeleton by tendons and are under voluntary control
Smooth Muscle Muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control.
Skeletal Muscle A muscle that is connected to the skeleton to form part of the mechanical system that moves the limbs and other parts of the body.
Homeostasis The tendency toward a relatively stable equilibrium between interdependent elements, especially as maintained by physiological processes.
Ligament A short band of tough, flexible, fibrous connective tissue that connects two bones or cartilages or holds together a joint.
Joint A structure in the human or animal body at which two parts of the skeleton are fitted together.
Spongy Bone Layer of bone tissue having many spaces and found found just inside the layer of compact.
Tendon a flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.
Compact Bone Hard, dense bone tissue that is beneath the outer membrane of a bone.
Red Marrow Bone marrow is the flexible tissue in the interior of bones. In humans, red blood cells are produced by cores of bone marrow in the heads of long bones in a process known as hematopoiesis.
Yellow Marrow Yellow bone marrow mainly stores fats.
Cartilage Firm, whitish, flexible connective tissue, being replaced by bone during growth. (infants)
Cardiac Muscle Muscles that pump your heart.
Integumentary System The integumentary system is an organ system consisting of the skin, hair, nails, and exocrine glands. The skin is only a few millimeters thick yet is by far the largest organ in the body.
Epidermis The outer layer of cells covering an organism, in particular.
Dermis The thick layer of living tissue below the epidermis that forms the true skin, containing blood capillaries, nerve endings, sweat glands, hair follicles, and other structures.
Melanin A dark brown to black pigment occurring in the hair, skin, and iris of the eye in people and animals. It is responsible for tanning of skin exposed to sunlight.
Follicle A small secretory cavity, sac, or gland, in particular.
Mechanical Digestion The process by which food is broken down into simple chemical compounds that can be absorbed and used as nutrients or eliminated by the body.
Chemical Digestion The process in which chemicals in the body separate large food molecules into smaller ones so they can pass through the wall (outer layer) of the intestine
Epiglotis A flap of cartilage at the root of the tongue, which is depressed during swallowing to cover the opening of the windpipe.
Peristalsis The involuntary constriction and relaxation of the muscles of the intestine or another canal, creating wavelike movements that push the contents of the canal forward.
Esophagus The part of the alimentary canal that connects the throat to the stomach; the gullet. In humans and other vertebrates it is a muscular tube lined with mucous membrane.
Absorption The fact or state of being engrossed in something.
Villus Any of numerous minute elongated projections set closely together on a surface, typically increasing its surface area for the absorption of substances, in particular.
Pacemaker An artificial device for stimulating the heart muscle and regulating its contractions.
Artery Any of the muscular-walled tubes forming part of the circulation system by which blood (mainly that which has been oxygenated) is conveyed from the heart to all parts of the body.
Capillary Any of the fine branching blood vessels that form a network between the arterioles and venules
Vein Any of the tubes forming part of the blood circulation system of the body, carrying in most cases oxygen-depleted blood toward the heart.
Plasma The colorless fluid part of blood, lymph, or milk, in which corpuscles or fat globules are suspended.
Red Blood Cell A cell in the blood that takes up oxygen in the lungs and delivers it to cells elsewhere in the body.
Hemoglobin A red protein responsible for transporting oxygen in the blood of vertebrates. Its molecule comprises four sub-units, each containing an iron atom bound to a heme group.
White Blood Cell A blood cell that fights diseases.
Platelet A small colorless disk-shaped cell fragment without a nucleus, found in large numbers in blood and involved in clotting.
Created by: AWelch123693