Baroreceptor
/ˌbæroʊrɪˈsɛptər/
Sensory nerve endings in the blood vessel walls that detect changes in blood pressure.
Basal Metabolic Rate
/ˈbeɪsəl ˌmɛtəˈbɒlɪk reɪt/
The rate at which the body uses energy while at rest to maintain vital functions.
Basophils
/ˈbeɪsəˌfɪlz/
A type of white blood cell involved in inflammatory reactions and allergic symptoms.
Bicuspid Valve
/baɪˈkʌspɪd vælv/
The heart valve between the left atrium and left ventricle; also known as the mitral valve.
Bile
/baɪl/
A digestive fluid produced by the liver and stored in the gallbladder that emulsifies fats.
Bilirubin
/ˌbɪlɪˈruːbɪn/
An orange-yellow pigment formed in the liver by the breakdown of hemoglobin.
Biofeedback
/ˌbaɪoʊˈfiːdbæk/
A technique used to learn how to control some of your body's functions, such as your heart rate.
Blastocyst
/ˈblæstəˌsɪst/
A thin-walled hollow structure in early embryonic development that contains a cluster of cells.
Bolus
/ˈboʊləs/
A small rounded mass of chewed food at the moment of swallowing.
Bowman's Capsule
/ˈboʊmənz ˈkæpsjuːl/
A cup-like sac at the beginning of the tubular component of a nephron in the kidney.
Brachial
/ˈbreɪkiəl/
Relating to the arm, specifically the upper arm or an anatomical structure resembling an arm.
Bradycardia
/ˌbrædɪˈkɑːrdiə/
A condition wherein the individual has a slow resting heart rate (typically under 60 bpm).
Brainstem
/ˈbreɪnstɛm/
The central trunk of the brain, consisting of the medulla oblongata, pons, and midbrain.
Bronchi
/ˈbrɒŋkaɪ/
The two main branches of the trachea that lead directly into the lungs.
Bronchiole
/ˈbrɒŋkioʊl/
Minute branches into which a bronchus divides, eventually leading to the alveoli.
Buffer
/ˈbʌfər/
A solution that resists changes in pH when acid or alkali is added to it.
Bulbourethral Gland
/ˌbʌlboʊjʊˈriːθrəl ɡlænd/
Glands that secrete a fluid into the urethra to neutralize acidity before ejaculation.
Bundle of His
/ˈbʌndəl əv hɪs/
A collection of heart muscle cells specialized for electrical conduction.
Bursa
/ˈbɜːrsə/
A fluid-filled sac or cavity situated in tissues where friction would otherwise occur.