Invalid OTP! Resend OTP? Send OTP. Share this question. Lakshmi Mehrotra Grade 9. The needs of a plant and animal are similar in some aspects and very different in others. Similar Questions why would a multicellular organism need a circulatory system Name a multicellular organism which reproduces by this method?
Answered by Simran J. Answered by Alisha F. Answered by Alice F. Answered by Nandesh P. Payment Security. However, endothermic warm-blooded organisms need an even more efficient method to maintain energy supply.
Internal lungs provide an enormous area of alveoli air sacs for exchange of gases with the external environment. Capillaries surround these air sacs, and gases are then transported around the body by the blood vessels.
Similarly food can be brought inside the body and digested by the digestive system but the simple food units still need to get to all individual cells. Again, the circulatory system is close to the area of absorption and carries out this role. Wastes produced in the cells need to be carried via the blood system to the kidneys excretory system for removal.
Exchange: Getting in and out The following factors affect how quickly the substances pass across the cell membrane. The bigger the surface area S.
All exchange areas are adapted for maximum surface area, e. Similarly the walls of the small intestine are highly folded into villi to increase surface area. The placenta too has an enormous network of capillaries, some belonging to the mother's circulatory system and others belonging to the baby.
They lie close together to aid exchange between the two systems. The faster the blood moves at the exchange surface the better. This keeps the concentrations high on one side and low on the other speeding up exchange via diffusion. Good blood pressure is essential.
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