Spinnbarkeit
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Spinnbarkeit (English:spinnability), also known as fibrosity, is a biomedical rheology term which refers to the stringy and/or stretchy property found to varying degrees in mucus, saliva, albumen and similar viscoelastic fluids. The term is used especially with reference to cervical mucus at the time just prior to or during ovulation,[1] and to sputum, particularly in cases of cystic fibrosis.[2]
Under the influence of estrogens, cervical mucus becomes abundant, clear, and stretchable, somewhat like egg white. The stretchability of the mucus is described by its spinnbarkeit, from the German word for the ability to be spun. Only such mucus appears to be able to be penetrated by sperm. After ovulation, the character of cervical mucus changes, and under the influence of progesterone it becomes thick, scant, and tacky. Sperm typically cannot penetrate it.
Saliva does not always exhibit spinnbarkeit, but it can under certain circumstances. The thickness and spinnbarkeit of nasal mucus are factors in whether or not the nose seems to be blocked.
Mucociliary transport depends on the interaction of fibrous mucus with beating cilia.[3]
References
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- ↑ Clift AF (1945 Nov). "Observations on Certain Rheological Properties of Human Cervical Secretion". Proc R Soc Med. 39 (1): 1–9. PMC 2181791 Freely accessible. PMID 19993188. Check date values in:
|date=(help) - ↑ Lai SK, Wang YY, Wirtz D, Hanes J (2009 Feb 27). "Micro- and macrorheology of mucus". Adv Drug Deliv Rev. 61 (2): 86–100. PMC 2736374 Freely accessible. PMID 19166889. Check date values in:
|date=(help) - ↑ Trindade SH, de Mello JF Jr, Mion Ode G, Lorenzi-Filho G, Macchione M, Guimarães ET, Saldiva PH. (2007 Sep-Oct). "Methods for studying mucociliary transport". Braz J Otorhinolaryngol. 73 (5): 704–12. PMID 18094814. Check date values in:
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