Download Grade 11 Biology Worksheet -2 ( Circulatory system) a)Give one

Grade 11
Biology Worksheet -2 ( Circulatory system)
a)Give one significant difference between each of the following:
1) Atrial systole and Ventricular systole
2) SA node and AV node
3) Mitral valve and Semi lunar valve
4) Effects of vagus nerve and sympathetic nerves
b) Explain why
1) SA node is called the pacemaker of heart.
2) The atrial systole normally precedes the ventricular systole.
3) Ventricle relaxes as a closed chamber in the early phase of its diastole.
4) You can palpate the pulse on an artery in each heart beat.
5) There is no mixing of oxygenated and deoxygenated blood in the human heart.
6) Atria have thinner walls than ventricles
7) Blood flows under pressure in the arteries.
c) Fill up the blanks:
1) The internal body fluids constitute the _____________.
2) Capillaries are found in _______ circulatory system and _____________ and in the open one.
3) The parasympathetic nerve fibres supplying the heart ____________ cardiac activity.
4) The ‘dub’ sound of heart is caused due to the closure of _______________.
5) The mitral valve has __________ cusps, while the aortic valve possesses ___________ cusps.
6) ______________ supplies bllod to the heart wall.
7) Plantlets help in ____________.
d) Give the most significant function of the following:
1) Haemoglobin 2) fibrinogen 3) globulins 4) Leucocytes 5) Megakaryocytes 6) SA node
e) State the best known contribution of :
1) William Harvey 2) Landsteiner
f) Expand the following:
1) ECF 2) AVN 3) SAN 4) ECG
Section : B
a) Define the following:
1) Angina 2) cardiac cycle 3) Diastole 4) Systole 5) Heart beat 6) Hypertension 7) Myocardial infarction
8) arteriosclerosis 9) Heart block 10) Purkinje fibres
b) Explain briefly:
1) Functions of circulatory system 2) Composition of human blood 3) Coagulation of Blood 4) Structure
of Human heart 5) Conduction of Heart beat 6) Cardiac cycle 7)Regulation of heart beat
8)Structure of Blood vessels 9) Hepatic portal system 10) Lymphatic system
11) ECG 12) Disorders related to the circulatory system