Extra Question:

Que: Name Some useful products or materials that are carried by blood.

Ans: Food, water and oxygen are the products that are carried by blood to every part of the body.

Que: circulatory system consists of three major organs. Nmae those organs.

Ans: the circulatory system consists of three major organs, blood, blood vessels and heart.

Que: Give the name of blood component which is liquid and contains 90% water.

Ans: The sticky liquid part of the bllod, containing 90% water is called plasma.

Que: Name the organ which is locted in the chest cavity with its lower tip slightly tilted towards the left.

Ans: The heart is located in the chest cavity with itsw lower tip slightly tilted towards the left.

Que: RBC contains a red colored pigment which carries oxyen with it. What is the pigment called?

Ans: The red colored pigment of RBC that carries oxygen with it is called haemoglobin.

Que: veins have valves which allow blood to flow only in one direction. Arteries do not have valves. yet the blood flow in one direstion only. Cn you explain why.

Ans: Veins have valves to prevent blood from flowing backwards and pooling, whereas arteries pump blood at very high pressures, whih naturally prevents back flow.

Que:In which from, the oxygen is transported to various body parts by heaemoglobin?

Ans: the red pigment, haemoglobin binds with oxygen to from oxyhaemoglobin which is transported to various body parts. 

Que: Certain greenish - blue lines appear just belowthe skin of our hands and leg. What are these?

Ans: The greenish - blue lines that appear just below the skin of our hands and legs are veins.

Que: human blood group is divided into how many group? name them.

Ans: Human blood group is divided into four group. These are A,B, AB and O.

Que: Blood is a fluid connective tissue. Justify?

Ans: Blood is a fluid which connects all the parts of body with each other.

Que: State the function of valves?

Ans: Valves prevent the back flow of blood between chambers of heart.

Que:Skin is also considered as an excretory organ. Give reson if you agree?

Ans: Yes, skin is an excretory orgen as it secretes waste products by releasing sweat from the surface.