13. In fish gill, gas exchange specifically occurs in the... copper? A) buccal c
ID: 146776 • Letter: 1
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13. In fish gill, gas exchange specifically occurs in the... copper? A) buccal cavity B) opercular cavity C) gill filaments D) secondary lamellae E) gill arches A) hemocyanin B) hemerythrin C) chlorocruori D) hemoglobin 20. If I told you that respiratory pigment 14. If water leaves the gills with a lower PO2 than the blood does, then the gill is using... weight, you would A) plasma A) countercurrent flow B) concurrent flovw C) Ram ventilation D) Water pump ventilation B) erythrocyte C) leukocytes D) extracellula E) lymph 15. Which of the following is NOT a structure used for gas exchange by some fish... A) Gills B) Intestines C) Lungs D) Alveoli E) Swimbladder F) Mouth 21. If one species h that is taller than a A) greater bin B) lower bind C) greater bin D) lower bind 38. V capill 22. Carbamino con A) transport B) buffer the C) are cataly D) occur at th E) occur at tl 16. Which of the following does NOT help return blood from the periphery to the heart? B) c) D) E) F) A) Valves B) Spiracles C) Skeletal muscles D) All help E) None help 23. If you want to tissues you shoul A) increase B) decrease 39. If the the partia A) 0m B) 700 C) 553 D) 147r E) 14mr 17. Can counter-current gas exchange occur with tidal ventilation? A) yes B) no C) maybe 24. The Bohr shif A) Binding B) Off-load C) Binding D) Off-loacd 18. For ventilation, which of the following groups lowers the sternum to generate low pressure in the chest cavity? 40. AnimalsI hemoglobin t A) lower B) greate C) no diff D) high le E) low bin A) lizards B) mammals C) crocodiles D) frogs E) birdsExplanation / Answer
Answer 13) C) Gill filaments
gaseous exchange takes place across the surface of highly vascularized gills. Gills are specialised organs containing filaments, which further divide into lamellae . The lamellae contain capillaries that provide a large surface area and short diffusion distances, as their walls are extremely thin. Gill rakers are found within the exchange system in order to filter out food, and keep the gills clean.
Answer 14) A - Countercurrent flow
Gills use a countercurrent flow system that increases the efficiency of oxygen-uptake (and waste gas loss).Oxygenated water is drawn in through the mouth and passes over the gills in one direction while blood flows through the lamellae in the opposite direction.
Answer 15) C
Answer 17) B
Mammals and insects both get their oxygen from air, while fish get oxygen from water. Water has a much lower oxygen concentration than air, and is harder to ventilate because it is more viscous. This means fish need to have a more efficient gas exchange system to get enough oxygen from the water. This is why fish have a unidirectional flow of water through the gills while mammals and insects have tidal ventilation
Answer 18) B Mamals do so in order to increase their chest cavity so they can get max air supply .
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