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biology 0610printed 119 · PDF 119
328 pagesrevision 46933
printed 119 · PDF 119
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What is the correct sequence for blood being pumped from the heart to the lungs?
left atrium — left ventricle — pulmonary artery
left atrium — left ventricle + pulmonary vein
2)
right atrium — right ventricle pulmonary artery
right atrium — right ventricle pulmonary vein
Why is the circulatory system of mammals described as a double circulation?
A Blood flows firstly through arteries and then through veins.
B Blood flows through the heart twice on one complete circuit of the body.
C In the heart, blood flows firstly through atria and then through ventricles.
D
The atria and the ventricles contract alternately.
Which substance is transported by haemoglobin?
A nitrogen
B oxygen
C urea
D water
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