Transport Systems
1. This question has 3 part(s).
1.1. The diagram shows the human heart with four blood vessels labelled A, B, C and D.
(i) Identify which blood vessel brings oxygenated blood to the heart.
(1)
☐ | A |
☐ | B |
☐ | C |
☐ | D |
(ii) Identify which blood vessel contains blood at the highest pressure.
(1)
☐ | A |
☐ | B |
☐ | C |
☐ | D |
1.2. (i) Draw a label line on the diagram to show the position of a semi-lunar valve.
(1)
(ii) Describe the function of the semi-lunar valves.
(2)
1.3. In the heart of a foetus, the two upper chambers (atria) are linked by a hole so that blood can pass between them.
(i) Explain why this hole is normally closed before the baby is born.
(2)
(ii) Sometimes the hole does not close.
Explain what effect this will have on the baby.
(3)
Ai এর মাধ্যমে
১০ লক্ষ+ প্রশ্ন ডাটাবেজ
প্র্যাকটিস এর মাধ্যমে নিজেকে তৈরি করে ফেলো
উত্তর দিবে তোমার বই থেকে ও তোমার মত করে।
সারা দেশের শিক্ষার্থীদের মধ্যে নিজের অবস্থান যাচাই
This question has 8 part(s).
“The patient’s own blood stem cells are extracted.”
Explain why stem cells are used in this treatment rather than other body cells.
Whooping cough is caused by the pathogen B. pertussis.
Pregnant women are advised to receive a vaccine against whooping cough.
Explain how a mother being vaccinated against whooping cough protects her unborn baby.
Explain how increasing wind speed affects the rate of water uptake by the shoot.
