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P

Plasma

the fluid part of blood that remains when a sample of blood is separated in a centrifuge

Plasma membrane

the membrane that surrounds a living cell; it consists of a double layer of phospholipids with embedded proteins

Platelets

also called thrombocytes, these are small particles derived from megakaryocytes, found in plasma, that are involved in the clotting mechanism of blood

Pleurisy

infection and inflammation of the pleural membranes. May be exudative or dry.

Pneumonia

infection and inflammation of the lungs

Pneumothorax

air in the pleural cavity

Polydipsia

excessive thirst and intake of fluid

Polyphagia

excessive appetite and intake of food

Polysynaptic reflex

a reflex that involves several intercalated neurons in the pathway

Polyuria

excessive excretion of urine

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