antagonist. 1. a muscle that counteracts the action of another muscle, its agonist. 2. a drug that binds to a cellular receptor for a hormone, neurotransmitter, or another drug blocking the action of that substance without producing any physiological effect itself.
in the body (Figure 20â1). In general, the more widely a cancer spreads, the harder it becomes to eradicate. It is generally metastases that kill the cancer patient. Cancers are traditionally classified according to the tissue and cell type from which they arise. Carcinomas are cancers arising from epithelial cells, and they
Squamous Cell Carcinoma of the Bladder is a rarer type of bladder cancer. The majority of bladder cancers are transitional cell carcinomas that arise in the urinary tract epithelium and can also occur in parts of the kidney, ureter and urethra (tubes carrying urine from the kidney and urinary bladder respectively).