Q. 34.8( 4 Votes )
The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in –
Capillaries are very thin walled, small vessels which form a network in the tissues for the absorption of nutrients and exchange of respiratory gases between the tissue and blood. They form a bridge between an artery and a vein.
The heart is the major pumping organ of the human circulatory system, that pumps blood to all body organs. The arteries carry oxygenated blood away from the heart and the veins carry deoxygenated blood to the heart.
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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)_____.NCERT - Exemplar Science
What are the components of blood?NCERT Science
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 _______.NCERT Science
Why is blood needed by all the parts of a body?NCERT Science
(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?NCERT - Exemplar Science
The absorption of nutrients and exchange of respiratory gases between blood and tissues takes place in –NCERT - Exemplar Science
Observe Figure 11.2 and answer the given questions: Fig 11.2
(a) Name the instrument.
(b) Label the parts A, B, and C.NCERT - Exemplar Science