T-Cell
/ˈtiː sɛl/
A type of lymphocyte which develops in the thymus and is central to the specific immune response.
Tachycardia
/ˌtækɪˈkɑːrdiə/
An abnormally rapid heart rate, typically defined as over 100 beats per minute at rest.
Target Cell
/ˈtɑːrɡɪt sɛl/
A cell which bears receptors for a hormone, drug, or other signaling molecule.
Tendon
/ˈtɛndən/
A flexible but inelastic cord of strong fibrous collagen tissue attaching a muscle to a bone.
Testosterone
/tɛsˈtɒstəroʊn/
A steroid hormone that stimulates development of male secondary sexual characteristics.
Tetanus
/ˈtɛtənəs/
A sustained muscle contraction evoked when the motor nerve that fires at a very high luminous rate.
Thalamus
/ˈθæləməs/
A gray matter structure in the forebrain that relays sensory signals to the cerebral cortex.
Thoracic Cavity
/θəˈræsɪk ˈkævɪti/
The chamber of the body of vertebrates that is protected by the thoracic spike (rib cage).
Thrombin
/ˈθrɒmbɪn/
An enzyme in blood plasma which causes the clotting of blood by converting fibrinogen to fibrin.
Thymus
/ˈθaɪməs/
A lymphoid organ situated in the neck of vertebrates that produces T cells for the immune system.
Thyroid Gland
/ˈθaɪrɔɪd ɡlænd/
A large ductless gland in the neck which secretes hormones regulating growth and development through the rate of metabolism.
Thyroxine
/θaɪˈrɒksiːn/
The main hormone (T4) produced by the thyroid gland, acting to increase metabolic rate.
Tidal Volume
/ˈtaɪdəl ˈvɒljuːm/
The amount of air which moves into or out of the lungs during a single respiratory cycle.
Tight Junction
/taɪt ˈdʒʌŋkʃən/
A specialized connection between two adjacent animal cell membranes such that there is no space between them.
Trabeculae
/trəˈbɛkjʊli/
A series or group of partitions formed by bands or columns of connective tissue, especially in spongy bone.
Trachea
/trəˈkiːə/
A large membranous tube reinforced by rings of cartilage, extending from the larynx to the bronchial tubes; the windpipe.
Transcription
/trænˈskrɪpʃən/
The process by which the information in a strand of DNA is copied into a new molecule of messenger RNA (mRNA).
Translation
/trænzˈleɪʃən/
The process by which a sequence of nucleotide triplets in mRNA gives rise to a specific sequence of amino acids.
Triglyceride
/traɪˈɡlɪsəraɪd/
An ester formed from glycerol and three fatty acid groups; the main constituents of natural fats and oils.
Tropomyosin
/ˌtroʊpəˈmaɪəsɪn/
A protein involved in muscle contraction, related to myosin and occurring with troponin in the thin filaments of muscle tissue.
Troponin
/ˈtroʊpənɪn/
A globular protein complex involved in muscle contraction, occurring with tropomyosin in the thin filaments of muscle tissue.