Flashcards
Transport systems in multi cellular animals
Flashcards do conjunto (14)
- 1Why are specialized transport systems needed in multi cellular organisms?- High metabolic demands
- Smaller SA:V ratio means long diffusion distances
-Hormones and enzymes are made in one place and needed in another
- Energy from food needs transporting to all cells
- Waste products need removing - 2What are the common features of a circulatory system?- Transport medium
- Vessels to carry medium
- Pumping mechanism to move medium - 3What steps are taken in an open circulatory system?- Medium pumped from heart t body cavity
(haemocoel)
- Comes into contact with tissues
- Diffusion
- Blood goes back to heart through open ended vessel - 4What organisms have open circulatory systems?Invertebrae
- 5What is insect blood called and what does it transport?- Haemolymph
- Transports food,nitrogenous waste and cells that fight disease - 6What are the main features of a closed circulatory system?- Blood enclosed in vessels
- Blood pumped at high pressure by heart
- Substances travel by diffusion through blood vessels (gas controlled by narrowing or widening these)
- Pigments carry gases - 7What organisms have closed circulatory systems?- Echinoderms
- Cephalopods
- Vertabraes - 8What is the pathway for single circulatory systems?Heart > Gills > Body > Heart
- 9What is the structure of the single circulatory system?
- 10What is exchanged at the gills?Oxygen and Carbon Dioxide
- 11What gets exchanged in the body?All other substances
- 12Why is the blood at low pressure in a single circulatory system?It passes through 2 capillaries
- 13What makes fish efficient when transporting substances even though they have a single system?- Counter current gas exchange
- Body weight supported by water
- Don not maintain their own body temp - 14What is the structure of a double circulatory system?
Informações
- Descrição
- AS level Biology (Chapter 08 - Transport systems in Animals ) FlashCards sobre Transport systems in multi cellular animals , criado por Bethany Westwood em 28-02-2017.
- Criado por
- Bethany Westwood
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