| A | B |
|---|
| excretion | the removal of metabolic wastes |
| nephridia | the excretory organ in the earthworm and other annelids |
| urine | an excretory liquid composed of water, urea, and salts |
| urea | a nitrogen waste formed by ammonia and carbon dioxide |
| Malpighian tubules | the excretory organ of the grasshopper |
| uric acid | a dry, nitrogenous waste product excreted by bird, repitiles and insects |
| kidneys | a pair of organs in vertebrates that excrete nitrogenous wastes and regulate the bloo's chemical balance; produce uring |
| ureter | a tube that carries urine from the kidney to the urinary bladder |
| urinary bladder | a saclike structure in which urine is stored |
| urethra | the tube that carries urine from the bladder to the outside |
| nephrons | the functional unit of the kidney |
| glomerulus | a group of capillaries in the nephorn of the kidney |
| Bowman's capsule | a double-walled cup-shaped structure surrounding the glomerulus |
| renal arteries | the vessels that bring blood to the kidneys |
| renal veins | the vessels through which blood flows from the kidneys |
| epidermis | in animals the outer layer of skin made of tightly packed epithelial cells |
| dermis | the layer of skin beneath the epidermis composed of elastic connective tissue |
| sebaceous glands | the glands in the skin that produce oily secretions |
| sweat glands | a gland composed of a tiny coiled tube that opens to the surface of hte skin and secretes perspiration |
