1. Draw a well labelled diagram of a human heart. 2. Differentiate between Arteries and Veins. 3. Write the functions of components of blood. 4. Give reason-a) Arteries are thick walled blood vessels. b) Veins have valves in them. 5. What is Lymph?
Answers
Answer:
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Answer:
Human heart.
Explanation:
1. Attached is the labeled diagram of the human heart.
2. Arteries and veins both help in the transportation of blood, Veins carry the oxygenated blood to the heart whereas the Arteries take deoxygenated blood away. Veins have thinner walls as compared to Arteries.
3. Blood has four components i.e. RBCs, WBCs, Platelets, and plasma. Red blood cells of RBCs have hemoglobin which helps in carrying oxygenated blood to organs and tissues. White blood cells or WBCs are highly active in infections or inflammation. They are of 5 types- neutrophils, basophils, eosinophils, lymphocytes, and monocytes. Neutrophils and monocytes engulf the bacteria and kill it. Platelets or thrombocytes help in blood clotting. Plasma transports all the cells or components of blood throughout the body.
4. a. Arteries are thick-walled so that they can hold the pressure released in the pumping of the heart.
b. Veins have valves that are one way only which can prevent the blood from going back to where it came from.
5. Lymph is a fluid that constitutes the lymphatic system. It acts as a barrier system toward microbes or foreign pathogens.
