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an ultrasound scan of the heart showing its structure and function.

the process by which sperm and seminal fluid is expelled from the male urethra (via the penis) during an orgasm.

a fertilised egg that starts dividing into a small ball of cells and implants into the wall of the uterus (womb) at the start of a pregnancy. After 9 weeks, the embryo is referred to as a fetus.

the hard white substance of each tooth that covers the crown. It is the hardest substance in the body.

a doctor who specialises in the study or treatment of hormone conditions.

ultrasound uses high frequency sound to visualise bits of the body. During endoscopic ultrasound, the patient is asked to swallow a very small camera attached to a tube. This makes it possible to look for tumours in the gut, which might occur in carcinoid syndrome, insulinoma, gastrinona and glucagonoma.

a biological catalyst. A type of protein produced by cells that changes the rate of a chemical reaction in the body.

a condition in which sudden bursts of brain activity lead to brief episodes of unconsciousness and convulsions.

difficulty in obtaining or maintaining an erection of the penis.

to expel a substance from the body. Excretion is the process by which a substance is expelled from the body.

the farthest out parts of the body such as the hands and feet.

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