Secondary atelectasis
Partial or total collapse of a lung or a segment of a lung that was once expanded, as may happen after chest surgery. Secondary atelectasis is in contrast to primary atelectasis in which there is failure of the lung to expand fully at birth.
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- Secondhand smoke
Smoke that comes from the burning end of a cigarette or that is exhaled by smokers. Inhalation of secondhand smoke is called involuntary or passive smoking. It can cause the same illnesses, including lung cancer, that actually smoking cigarettes causes. Also known as environmental tobacco smoke (ETS).
- Secretary's knee
The patellofemoral syndrome (PFS), the commonest cause of chronic knee pain. PFS characteristically causes vague discomfort of the inner knee area, aggravated by activity (running, jumping, climbing or descending stairs) or by prolonged sitting with knees in a moderately bent position (the so-called “theater sign” of pain upon arising from a desk or theater seat). […]
- Secretase, beta-
650-651. (The accompanying commentary on the discovery.)
- Secretin
A hormone that is made by glands in the small intestine whose primary function is the stimulation of pancreatic secretion. Secretin is often administered as part of the endoscopy process. Commercially available secretin is either porcine (from pigs) or a synthesized form of human secretin.
- Section
1) In anatomy, a slice of tissue. A biopsy obtained by surgery is usually sectioned (sliced), and these sections are inspected under a microscope. 2) In obstetrics, short for Cesarean section. 3) In surgery, the division of tissue during an operation.