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efnask. ofl. k.7

Líffræði

QuestionAnswer
Orkan sem líkaminn losar sig við breytist fyrr eða síðar í______? Varma
Hver er jafnan fyrir flatarmál húðar? F=H^0,725 X Þ^0,425 x 71,84
Efnaskiptin eru örari í körlum en konum. Satt Ósatt Satt
Menn brenna meiru í hita en kulda. Satt Ósatt Ósatt
Langflestar lífverur eru misheita(með kalt blóð) Satt Ósatt Satt
Spendýr, fuglar og froskar eru jafnheit dýr. Satt Ósatt Ósatt, ekki froskar
Hvað er það sem getur aukið varmaframleiðslu líkamans á nokkrum sekúndum? Skjálfti rákóttra vöðva
4 hlutir sem hafa áhrif á hitastig manns: Breytt blóðrás í húð (æðar í húð sem þrengjast og víkka eftir þörfum), breytt líkamsstaða (t.d. hnipra sig saman í kulda), útgufun hita (sviti kælir húð) og klæðnaður og hýbíli... því döh
Hitanemum má skipta í: Útnema í húð og slímhimnum efst í meltingarvegi og Miðnema, í hitastjórnstöðvum í undirstúku, mænu og innyflum
Hvað er brún fita? Í henni er ríkuleg blóðrás og þett net driftauga. Við bruna myndast ekkert ATP, en hún losnar snögglega og í miklum mæli í ungabörnum. Hún brennur sjálf og myndar fljótt varma.
Fellur líkamshiti við tíðir?
Líkamleg áreinsla getur hækkað líkamshita upp fyrir 40°C Satt Ósatt Satt
Created by: karitas03
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