MEDIUM
11th West Bengal Board
IMPORTANT
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SA Node is known as the pacemaker of heart.

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Important Questions on Body Fluids and Circulation

MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 8
The AV node is present below the atrioventricular septum.
MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 9
Bundle of His initiates cardiac impulse at the rate of 30-35/min.
MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 10
Purkinje fibres are the fibres supplying the ventricular muscles.
MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 11
The first heart sound results from the closure of semilunar valves.
MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 12
Semilunar valves present at the base of the aorta open during ventricular systole.
HARD
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 13
Bicuspid and Tricuspid valves allow the blood to flow from the ventricle to arteries but not in the opposite direction.
MEDIUM
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 14
The duration of the cardiac cycle is 0.8 seconds. 
HARD
11th West Bengal Board
IMPORTANT
A TEXT BOOK OF BIOLOGY CLASS 11>Chapter 16 - Body Fluids and Circulation>EXERCISE>Q 15
During stimulation of the sympathetic nerve, the heart rate and cardiac cycle time increases.