Atrioventricular (AV) Node: Tissue in the right ventricle of the heart that receives the impulse from the atria and transmits it through the ventricles by way of the bundles of His and the Purkinje fibers.

 

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Atrioventricular (AV) Node: Tissue in the right ventricle of the heart that receives the impulse from the atria and transmits it through the ventricles by way of the bundles of His and the Purkinje fibers.

Nodes: The two points in a planet's orbit which intercept the Earth's path around the sun (otherwise known as the ecliptic).

Palinode: An ode or song that retracts what the poet wrote in a previous poem: a recantation.

Node Of Ranvier: A gap between two of the Schwann cells that make up an axons myelin sheath; serves as a point for generating a nerve impulse.

Node Factor (F): A factor depending upon the longitude of the Moon's node which, when applied to the mean coefficient of a tidal constituent, will adapt the same to a particular year for which predictions ar . . . View Full Definition

Planetary Node: The point at which a planet's path intersects the ecliptic; declination, 0°. The term is usually reserved for nodes other than the Moon's Nodes.

Reishi Mushroom (Ganoderma sinensis): An immunostimulant

Sinoatrial (SA) Node: A region of modified muscle cells in the right atrium that sends timed impulses to the hearts other muscle cells, causing them to contract; the hearts pacemaker.

Simian Immunodeficiency Virus (SIV): A virus that is found, in numerous strains, in primates.

Severe Combined Immunodeficiency (SCID): A genetic disorder in which affiicted individuals have no functional immune system and are prone to infections. Both the cell-mediated immune response and the antibody-mediated response are absent.