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level: Fish and plants and insects

Questions and Answers List

level questions: Fish and plants and insects

QuestionAnswer
Where does gas exchange occur in gills ?The surface of gills
Blood flow in the gillsDe ox blood flows into each gill filament via afferent arteriole that branches into small capillaries across the lamellae .Oxygen from water diffuses into the capillary along a conc gradient. Oxygenated blood flows out of the gill filaments via the efferent arteriole.
Concurrent mechanisma current flowing in the opposite direction of the other current so no equillibrium is reached so they is always a conc gradient
Structural adaptations in fish-small branching capillaries = large surface area -lamellae are made of single layer ephithelial cells= short difusion pathway -maintain conc gradient = concurrent mech -
What does a stomata doGases diffuse in and out water enters into guard cells by osmoisis making them turgid to open
Structural adaptions of the stomata-numerous mesophyll cells lining the intercellular air spaces= large surface area - leaves are thin so short diffusion pathway -respiration and photosynthesis maintain conc gradient
What are spiracles?Pores running on the side of the body open and close like valves
Insect gas exchangeSpiracles open letting air in system tubes carry the air to repsiring tubes large tubes called the trachea branch into small tubes called tracheoles to the cells