Respiration in Animals

41. 41. Fish take in oxygen-rich water through their mouth and send it over their …

• skin

• gills

• nostrils

• spiracles

42. 42. In respiration of a fish, as water passes over the … , oxygen is absorbed.

• mouth

• vessels

• gill filaments

• operculum

43. 43. Each gill filament is supplied with some  small …

• mouth

• vessels

• throat

• operculum

44. 44. Blood enters and leaves the gills through the small blood …

• mouth

• vessels

• throat

• operculum

45. 45. … is removed from the body through the gills.

• oxygen

• carbon dioxide

• blood

• nitrogen

46. 46. After the water flows through the gills, it exits the body through the …

• mouth

• vessels

• throat

• operculum

47. 47. Picture 4 shows ...

• operculum

• gill filaments

• gill arch

• blood vessels

48. 48. Gill arch is shown by picture ...

• 1

• 2

• 3

• 4

49. 49. Picture 2 shows ....

• operculum

• blood vessels

• gill arch

• gills filaments

50. 50. Gills are made up of … that allow gas exchange.

• mouth

• vessels

• gill filaments

• operculum