Sci Chap 15 Dnltilton

Front 1

cell

Back 1

the smallest unit of life

Front 2

cell membrane

Back 2

membrane that separates the interior of all cells from the outside environment

Front 3

nucleus

Back 3

a dense organelle present in most eukaryotic cells, typically a single rounded structure bounded by a double membrane, containing the genetic material

Front 4

cytoplasm

Back 4

is that part of the cell between the cell membrane and the nuclear envelope

Front 5

tissue

Back 5

a cellular organizational level intermediate between cells and a complete organ

Front 6

muscle tissue

Back 6

a soft tissue found in most animals

Front 7

nerve tissue

Back 7

the main component of the two parts of the nervous system

Front 8

connective tissue

Back 8

tissue that connects, supports, binds, or separates other tissues or organs, typically having relatively few cells embedded in an amorphous matrix, often with collagen or other fibers, and including cartilaginous, fatty, and elastic tissues

Front 9

epithelial tissue

Back 9

covers the whole surface of the body

Front 10

organ

Back 10

a group of tissues in a living organism that have been adapted to perform a specific function

Front 11

organ system

Back 11

a group oforgans that work together to perform one or more functions

Front 12

homeostasis

Back 12

the ability to maintain a constant internal environment in response to environmental changes

Front 13

stress

Back 13

a body's method of reacting to a challenge

Front 14

vertebra

Back 14

each of the series of small bones forming the backbone, having several projections for articulation and muscle attachment, and a hole through which the spinal cord passes

Front 15

marrow

Back 15

a soft fatty substance in the cavities of bones, in which blood cells are produced (often taken as typifying strength and vitality

Front 16

cartilage

Back 16

firm, whitish, flexible connective tissue found in various forms in the larynx and respiratory tract, in structures such as the external ear, and in the articulating surfaces of joints. It is more widespread in the infant skeleton, being replaced by bone during growth

Front 17

joint

Back 17

a structure in the human or animal body at which two parts of the skeleton are fitted together

Front 18

ligament

Back 18

a short band of tough, flexible, fibrous connective tissue that connects two bones or cartilages or holds together a joint

Front 19

osteoporosis

Back 19

a medical condition in which the bones become brittle and fragile from loss of tissue, typically as a result of hormonal changes, or deficiency of calcium or vitamin D

Front 20

involuntary muscle

Back 20

a muscle that contracts without conscious control

(ACTS ON ITS OWN)

Front 21

voluntary muscle

Back 21

muscle whose action is normally controlled by an individual's will

(DOES NOT ACT ON ITS OWN)

Front 22

skeletal muscle

Back 22

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

Front 23

tendon

Back 23

a flexible but not stretchy cord of strong fibrous collagen tissue attaching a muscle to a bone

Front 24

smooth muscle

Back 24

muscle tissue in which the contractile fibrils are not highly ordered, occurring in the gut and other internal organs and not under voluntary control

Front 25

cardiac muscle

Back 25

the muscular tissue of the heart

Front 26

epidermis

Back 26

the outer layer of cells covering an organism, in particular

Front 27

melanin

Back 27

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

Front 28

dermis

Back 28

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

Front 29

pore

Back 29

One of the minute orifices in an animal or vegetable membrane, for transpiration, absorption, etc.

Front 30

follicle

Back 30

a small secretory cavity, sac, or gland, in particular`

Front 31

cancer

Back 31

disease caused by an uncontrolled division of abnormal cells in a part of the body

Front 32

acne

Back 32

the occurrence of inflamed or infected sebaceous glands in the skin; in particular, a condition characterized by red pimples on the face, prevalent chiefly among teenagers