6-blockers Also known as ^-adrenoceptor blocking drugs. Agents which act on sympathetic nerves to block the action of adenaline and noradrenaline.

6-cyclodextrins see Cyclodextrins.

6-glucosidase An enzyme that catalyses the hydrolysis of a glucoside.

^-glucuronidase An enzyme that splits glycosidic linkages in glucuronides.

B cells Lymphoid stem cels from the bone marrow which migrate to and become antigen specific cells in the spleen and lymph nodes.

B lymphocytes Cells which identify foreign antigens and can differentiate into antibody producing plasma cells or memory cells.

Bacteroid Resembling bacteria.

Bartholin's glands A small compound mucous gland situated one in each lateral wall of the vestibule of the vagina.

Basal lamina Bottom most layers of cells of a membrane. Gives structural integrity.

Basement membrane See Basal lamina.

Bauhin's valve Ileocaecal valve.

Beclomethasone A corticosteroid drug.

Benzalkonium chloride An antibacterial preservative.

Benzocaine A local anaesthetic used topically.

Benzoic acid Compound used in keratolytic ointments.

Betaxolol A 6-blocking drug.

Bethanechol Cholinergic drug used to treat paralytic ileus and urinary retention not caused by organic disease.

Bidisomide A sodium channel blocker used as a cardiovascular anti-arrhythmic.

Bifidobacterium A soil-borne bacterium commonly colonizing the gastrointestinal tract.

Bile A secretion of the liver. A thick viscid fluid that has a bitter taste. Used to emulsify dietary fats and oils prior to absorption.

Bioadhesion Adhesion of a substance to a biological substrate.

Bladder A membranous sac or receptacle for secretions.

Bleomycin Any one of a group of antitumour agents produced by Streptomyces verticillus.

Blood-brain barrier A barrier membrane between circulating blood and the brain preventing damaging substances from reaching the brain and cerebrospinal fluid.

Bowman's membrane Membrane separating corneal epithelium from corneal substance.

Bromisoval (Bromisovalum) A sedative and hypnotic drug

Bronchiectasis Chronic dilatation of a bronchus or bronchi.

Bronchitis Inflammation of mucous membrane of the bronchial tubes.

Brunner's glands Compound gland of the duodenum and upper jejunum. They secrete a clear alkaline mucinous fluid.

Budesonide Corticosteroid used to treat asthma.

Bulimia nervosa Disorder which is characterised by binge eating and vomiting to control weight.

Buprenorphine Opioid with both agonist and antagonist properties. Used as an adjunct in opioid dependence, premedication and analgesia.

Buserelin Gonadorelin analogue used to treat prostate cancer.

Butorphanol Anti-migraine drug.

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