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.

 

Many modern educational programs are based on this: their authors try to integrate English into the student’s life and bring it as close as possible to reality. And one of the most obvious (and fun!) Ways to do this is with songs in English. Most of us come across foreign music all the time: in the posts of friends on social networks, on the radio or as soundtracks for films, so you don’t have to invent something new. You just need to pay attention to songs in English as a language learning tool. So what exactly is listening to music superior to traditional teaching methods?