OSMOREGULASI & EKSKRESI - Website Staff UI

104 downloads 133 Views 417KB Size Report
pengaturan tekanan osmose organisme. Upaya adaptasi organisme di perairan. ❖ Fungsi ekskresi : mengekskresikan sisa-sisa metabolisme agar. pH cairan ...
OS M OR E G UL A S I & E K SK R E SI

titi doc.2009

 Osmoregulasi adalah:

Proses pengontrolan keseimbangan [osmotik] internal (H2O & ion dlm tubuh organisme) dan lingkungan eksternal atau dg. kata lain proses pengaturan tekanan osmose organisme. Upaya adaptasi organisme di perairan  Fungsi ekskresi :

mengekskresikan sisa-sisa metabolisme agar pH cairan tubuh terpelihara.

Osmoconformers = animals that conform to the osmolarity of the environment, e.g. marine elasmobranchs, coelacanth, crab-eating frog, various marine invertebrates Osmoregulators = animals that maintain an internal osmolarity different from the environment; most vertebrates (including teleosts) are strict osmoregulators Osmoregulation = biological processes involved in the maintenance of the osmolarity of body fluids within the range of physiological tolerance of the species - maintaining solute (salt) concentration in body fluids - maintaining water balance in body → gills, kidneys and intestine are main osmoregulatory organs

Stenohalin

Toleransi organisme terhadap salinitas

 Avertebrata laut (umumnya):

Eurihalin

[osmotik] internal tubuhnya relatif Isotonik terhadap lingkungannya.  Organisme perairan tawar : [osmotik] internal tubuhnya hipertonik terhadap lingkungannya.

Freshwater critters live in a HYPOTONIC environment

http://www.emc.maricopa.edu/faculty/farabee/BIOBK/BioBooktransp.htm l

 Crustacea yang hidup di laut:

Secara kontinyu minum medium air laut (ion-Na, Cl & H2O) difusi tubuh transpor aktif

green gland & insang : eliminasi garam (ion–Na; Cl) ekskresi lingkungan luar. difusi Sel-sel tubuh berfungsi mengatur keseimbangan H2O ; insang mengatur keseimbangan ion-ion.

Excretion • Ammonia 90-95% • Gills • Antennal or maxillary glands • Adjust ion concentration in hemolymph

THANK YOU

titi doc.2009