The Inside Scoop on Sharks
Blood, guts, muscles, and more… that’s what’s inside a shark. Like all animals, sharks have a brain, heart, stomach, intestines, and other organs. But they have some parts that are different, too.
Vertebral Column: A shark’s backbone extends into the top part of its tail fin. This stiff fin helps sharks speed through the water!
Brain: A shark’s brain controls all of a shark’s actions, just like how your brain controls your actions. A lot of a shark’s brain is used for its senses, including smell and sight. You’ll learn more about a shark’s super senses on pages 23 and 24.
Liver: A shark’s liver is filled with oil. Oil is lighter than water, so a shark’s large liver helps it stay afloat.
Gills: Sharks use blood-filled gills to absorb oxygen out of the water.
Hot Blood or Cold?
Most fish, and most sharks, have blood that is the same temperature as the water around them. So, if the water is cold, their blood is cold. Five kinds of sharks, including great white sharks, like Bruce, have warm blood like you do. These fast-swimming sharks hold onto some of the heat produced by their powerful muscles.
Breathing like a shark
Like all fish, sharks get the oxygen they need from the water. Water flows in through their mouth, across their gills, and out through five to seven gill slits. Blood in their gills draws oxygen out of the water.
Sharks that live on the ocean floor, like nurse sharks, bring water to their gills through holes on the top of their head. This way, their gills aren’t clogged with sand or mud.
具體描述
讀後感
評分
評分
評分
評分
用戶評價
相關圖書
本站所有內容均為互聯網搜索引擎提供的公開搜索信息，本站不存儲任何數據與內容，任何內容與數據均與本站無關，如有需要請聯繫相關搜索引擎包括但不限於百度，google,bing,sogou 等
© 2025 book.quotespace.org All Rights Reserved. 小美書屋 版权所有