Page 131 - Biology Form Two
P. 131
Biology for Secondary Schools
8. People with blood group AB have 11. Explain the following:
________. (a) how being thick-walled,
(a) antibody b muscular and elastic help
(b) antibody a arteries to transport blood
(c) antibodies a and b from the heart to the rest of
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(d) no antibody the body;
9. Choose a term from the box that (b) why arteries do not need
best matches each of the phrases valves; and
that follow. (c) why small organisms such
arteriosclerosis, hypertension, as amoeba and paramecia
cardiac cycle, bicuspid, do not need the blood
pulmonary vein, vena cava, circulatory system.
veins, artery. 12. The heart has its own supply of
blood from vessels that run all
(a) A valve between the left over its surface.
atrium and left ventricle of (a) Name these vessels.
the heart (b) In some people, the above
(b) A large vein that empties mentioned vessels can be
blood into the left atrium of blocked by a blood clot.
the heart Explain the effects of these
vessels getting blocked.
(c) The tubes that form a
branching system and carry 13. Explain
blood to the heart (a) how lifestyle and diet may
(d) Hardening and narrowing of cause problems in the
an artery circulatory system; and
(b) why the heart beats faster
(e) High blood pressure during exercise.
14. Explain the importance of
Section B
thrombocytes.
10. Explain what would happen if 15. Differentiate the following:
(a) the capillaries had thick (a) pulmonary circulation and
walls; and systemic circulation;
(b) the left ventricle had thin (b) artery and vein;
walls. (c) thrombin and prothrombin;
and
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BIOLOGY FORM 2 NEW.indd 125
