1. What is transportation? Transportation is a life process in which a substance absorbed or synthesised in one part is moved or transported to other parts of the body. 2. What is the need for transportation in living beings? Transportation in living beings is required for the transport of
(i) nutrients
(ii) metabolic wastes
(iii) respiratory gases
(iv) hormones, enzymes and other metabolites
(v) water, ions and heat
(vi) protection against disease. 3. What is the need of special tissues or organs for transport of substances in multicellular organisms? All living organisms require certain basic material for survival and maintenance like oxygen, water, food etc.
In unicellular organism, these materials are picked, synthesised and utilised by the same single cell.
In multicellular organisms, these important materials may be picked or synthesised in one part of body but utilised in some other part or parts.
So there is a requirement of special tissue or organs, which can transport these materials to various body parts of the organism. 4. What are the basic things required for transportation of material in human body? Basic things required for transportation of material in human body are:(i) Fluid medium to carry material - Blood
(ii) A pump to push this fluid - Heart
(iii) A network of tubes to carry this fluid to various body parts- Blood vessels
(iv) A system that ensure maintenance and repair of this network of tubes damaged- Platelets. 5. Name the fluid connective tissue that helps in transportation in human beings. Blood 6. How are different material carried through blood? Blood consists of fluid medium called plasma in which various corpuscles are present. Plasma transports salts, food, carbon dioxide and nitrogenous wastes in dissolved form. Oxygen is carried by haemoglobin present in the red blood corpuscles. Human Heart 1. Draw a labelled diagram of external structure of human heart. 
2. Describe the structure of human heart. - Human heart is four chambered.
-Two upper chambers are atria and two lower are ventricles.
- Atria receives blood and ventricles transport blood out of the heart.
- These chambers are separated by partition called septa.
- Between left auricle and right ventricle valves are present to prevent back flow of blood.
- Heart is made of special muscles called cardiac muscle fibres. 3. Draw a labelled diagram showing internal structure of human heart.
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