Aspirin & penicillin answers
1. (a) An analgesic is a substance that reduces pain. Mild analgesics work at the site of the injury by preventing particular enzymes (e.g. prostaglandin synthase) being formed. This prevents the formation of prostaglandins, which are responsible for swelling and the transmission of pain.Strong analgesics work by acting temporarily with receptor sites in the brain so that pain signals within the brain and spinal cord...