The respiratory system mainly consists of the lungs. The lungs give oxygen to the body, when you inhale air. They are responsible for removing carbon dioxide from the body. The circulatory system mainly consists of the heart. The heart pumps blood through the body, giving us oxygen. The heart is responsible for pumping blood and creating new blood cells. If we did not have a heart then there would be no blood, therefore, no oxygen. If you think about it, the body's oxygen transport system takes oxygen to the working muscles, through the circulatory and respiratory systems working together. The main workers are the heart, blood and lungs. The whole oxygen transport system works in a cycle.
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You didn't write the whole statement but i had this so;
DNA gets transcribed to mRNA through a process called transcription. Then the mRNA will leave the nucleus to go to the ribosome. At the ribosomes, tRNA will come with an amino acid and find its perfect match in order to drop the amino acid off. A lot of amino acids will form a polypeptide chain which will make a protein. That process is called translation.
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Answer:
The immune system is a complex network of cells and proteins that defends the body against infection. The immune system keeps a record of every germ (microbe) it has ever defeated so it can recognise and destroy the microbe quickly if it enters the body again.
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