Book Lungs And Book Gills Are Found In
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Book gills are flap like appendages that effect gas exchange within water and seem to have their origin as modified legs.
Book lungs and book gills are found in. The most specialised gills are seen in xiphosurids where the abdominal append ages bear plate like book gills fig. Book lungs and tracheae. It is believed that book lungs evolved from book gills although they have a similar book like structure book gills are external while book lungs are internal.
Book lungs are sac like structures within which there are delicate folds that are arranged like the leaves of a book. Spiracle in arthropods the small external opening of a trachea respiratory tube or a book lung breathing organ with thin folds of membrane resembling book leaves. Spiracles are usually found on certain thoracic and abdominal segments.
Book gills are still present in the marine arthropod limulus horseshoe crabs which have five pairs of them. Book gills are still found in horseshoe crabs which have five pairs of them the flap in front of them being the genital operculum which lacks gills. These folds are richly supplied with blood.
The four pairs of book lungs are located in the third fourth fifth and sixth mesosomal segments. Both are considered appendages because book lungs develop from limb buds before the buds flatten into segmented lamellae. A both assertion and reason are true and reson is the correct explanation of assertion.
Each horseshoe crab has six pairs of book gills and the outermost flaps are a covering called an operculum some sources don t include the operculum as one of the book gills so you may hear that. Book lungs are found in hardened pockets generally located on the underside of the abdomen. Fish and other aquatic creatures like most crabs have gills to extract oxygen out of the water.
Each gill contains nearly 150 lamellae which look like the delicate leaves of a book. B both assertion and reason are true but reason is not the correct explanation of assertion. A arthropods have respiratory organs like gills book gills book lungs or tracheal system.
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