Stamp4Life,
While I posted many stamps designed or engraved by Gandon in this thread or in others (like the birds thread), I posted little from Martin Mörck. So here is a set engraved by Mörck, shows winners of the Nobel Prize in physiology and medicine and their contributions, designed by Urban Frank or Nils Peterson as indicated on the stamps, and issued by Sweden on November 29, 1984:
Georg von Békésy (1899-1972), Hungary, Noble Prize in 1961 for his discoveries of the physical mechanism of stimulation within the inner ear.
Stamp shows a diagram of the inner ear:

Sir John Carew Eccles (1903-1997), Australia, Sir Alan Lloyd Hodgkin (1914-1998), UK, and Sir Andrew Fielding Huxley (1917-2012), UK, Noble Prize in 1961 for their discoveries concerning the ionic mechanisms involved in excitation and inhibition of the nerve cell membrane causing electric transmission.
Stamp shows nerve cell and arrows representing influx of Na+ and H+ ions through ionic channels:

Sir Bernard Katz (1911-2003), UK, Julius Axelrod (1912-2004), USA, and Ulf Svante von Euler (1905-1983), Sweden, Noble Prize in 1970 for their discoveries concerning the neurotransmitters in the nerve terminals and the mechanism for their storage, release and inactivation:
Stamp shows (left) cross section of a nerve cell shows the nucleus and the mitochondria and (right) activation of muscle cell by neurotransmitters released by nerve cell to the nerve-muscle junction (synapse):

Roger Wolcott Sperry (1913-1994), USA, Noble Prize in 1981 for his discoveries concerning the functional specialization of the cerebral hemispheres.
Stamp shows the brain hemispheres and their activities:

David Hunter Hubel (1926-2013), Canada, and Torsten Nils Wiesel (1924- ), Sweden, Noble Prize in 1981 for their discoveries concerning information processing in the visual system.
Stamp shows cross section of the eye on the background of optic nerves:

Issued as a mini-sheet in a booklet:
