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:
