What is Circulatory System in Animals and its Importance
Circulatory System in Animals
It is system by which materials are transported within the body in a fluid which circulates in the body. In many vertebrates this fluid is called hemolymph, while in all vertebrates and in some higher invertebrates this fluid is called blood.
There are two types of circulatory system:
Open Circulatory System:
In this type blood is pumped through heart in open spaces called sinuses. The blood is in direct contact with tissues and after exchange of materials it returns back to heart.
Closed Circulatom System:
In this type muscular heart is present with its incoming (veins) and out going (arteries) vessels. The blood remains confined to the blood vessels during circulation.
It is elaborated, complicated and efficient system.
Note: An excellent system of memorizing words is hidden in the study of English proverbs and rhymes. So, remembering a small quotation, analyzing its content, you learn a few words at once. Learn your favorite English songs and translate them. So, the words and their use, the combination in sentences put in your memory. Keep your own notepad where you can write each new word several times. So, you will develop visual memory and motor skills. Test your knowledge by closing foreign words and reading Russian. After that, opposite the Russian words, next to the pencil write down their English spelling. Say it out loud. An excellent option is pair learning. Together, it will be easier to learn new material and control each other.