Category: P

  • Primary malnutrition

    Ill health that originates from lack of ability to benefit from a normally healthy diet.  

  • Primary follicle

    Structure of the ovary consisting of an immature ovum and a single layer of epithelial cells.  

  • Premature atrial contractions

    Early cardiac beats arising from the atrium of the heart due to early depolarization of the atrium; pathology may result from ischemic or enlarged myocardium or stress, nicotine, or caffeine.  

  • Precapillary sphincters

    Structures between capillaries and arterioles that regulate blood flow to capillaries. A smooth muscle cell found at the beginning of a capillary network. It regulates capillary blood flow.  

  • Postmortem examination

    Inspection of the body after death to ascertain cause of death. Also called an autopsy (and less commonly, necropsy), this is an examination of a body to discover the causes of death. Such an examination is sometimes required by law: in the UK this includes any death occurring in suspicious circumstances, or a death for…

  • Postictal period

    Timeframe following seizure activity during which the level of consciousness is decreased.  

  • Postganglionic nerve fiber

    An axon of the sympathetic and parasympathetic neuron located after the ganglionic terminus at the muscle or gland. A nerve fiber of the autonomic nervous system that terminates in smooth or cardiac muscle or in a gland. Its cell body lies in an autonomic ganglion.  

  • Posterior parathyroid

    Endocrine gland which regulates blood calcium and phosphorus ion levels by excretion of parathyroid hormone.  

  • Posterior inferior vena cava

    The primary vein that drains blood from the lower portion of the body and joins the two common iliac veins and ends at the right atrium of the heart.  

  • Posterior fornix

    The deepest of the four recesses of the cervix.