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Answers
ANSWER
QUE 6
In birds and mammals have a double circulation system where both the oxygenated and deoxygenated blood maintains separate. ... They must separate oxygenated and de-oxygenated blood so that their circulatory system is more efficient and can maintain their constant body temperature.
Q7
Haemoglobin is the respiratory pigment that transports oxygen to the body cells for cellular respiration. Therefore, deficiency of haemoglobin in the blood can affect the oxygen supplying capacity of the blood. This can lead to a deficiency of oxygen in the body cells. It can also lead to a disease called anaemia.
Q8
These have thin walls when compared with the arteries because arteries carry the blood from the heart. They withstand the pressure that has thick walls whereas veins have low pressure. As they have low pressure, they have thin walls. Note: Arteries and veins are the vessels that distribute blood to the body.
Q9
a posterior vena cava
b pulmonary artery
c interior vena cava
Q10
Alveoli and nephron act as the structural and functional units of lungs and kidneys respectively. Alveoli occur in the respiratory system while the nephrons occur in the excretory system. The cell wall of alveoli and nephrons is thick and surrounded by blood capillaries.
ans is continue in pic please go through pic for this ans .
Q11
The blood circulation in human heart is called double circulation because the blood passes through the heart twice in one complete cycle of the body – once through the right half in the form of deoxygenated blood and once through the left half in the form of oxygenated blood.
flow chart id in image .
Q 12 ans is in pic please go through the image
Q13 please go through image ..
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