Match the parts of the heart in Column I with the direction of flow of blood in Column II.

Fill in the blanks of the following paragraph using just two words – arteries and veins.

___(a)___ carry oxygen-rich blood from the heart to all parts of the body and ___ (b)___ carry carbon dioxide-rich blood from all parts of the body back to the heart. ___ (c)___ have thin walls and __ (d)___ have thick elastic walls. Blood flows at high pressure in ___ (e)____. Valves are present in __ (f) ___ which allow blood to flow only towards the heart. __ (g)___ divide into smaller vessels. These vessels further divide into extremely thin tubes called capillaries. The capillaries join up to form ____ (h)_____.

What are the components of blood?

Fill in the blanks.

i. The blood from the heart is transported to all parts of the body by the _________.

ii. Hemoglobin in present in ______ cells.

iii. Arteries and veins are joined by a network of _____.

iv. The rhythmic expansion and contraction of the heart is called_____.

v. The main excretory product in human beings is ______.

vi. Sweat contains water and ________.

vii. Kidneys eliminate the waste materials in the liquid form called______.

viii. Water reaches great heights in the trees because of suction pull caused by _______.

What will happen if there are no platelets in the blood?

Why is transport of materials necessary in a plant or animal? Explain.

(a) Name the only artery that carries carbon dioxide-rich blood.

(b) Why is it called an artery if it does not carry oxygen-rich blood?

The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in –

Observe Figure 11.2 and answer the given questions: Fig 11.2

(a) Name the instrument.

(b) Label the parts A, B, and C.

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

What is the special feature present in a human heart which does not allow mixing of blood when oxygen-rich and carbon dioxide-rich blood reach the heart?