Transport System

The pacemaker of the heart is also known as the....

• AV node

• SA node

• Purkinje fibres

• Bundle of His

During atrial contraction and ventricular filling,

• The AV valves are open

• The semilunar valves are open

• The ventricles are contracted

• The atria are relaxed

Which statement is WRONG about cardiac cycle?

• One complete cardiac cycle takes 0.8 second

• Atrial & ventricular diastole takes 0.4 second

• Ventricular systole takes 0.2 second

• Atrial systole takes 0.1 second

SA node→ Atria → AV node → Y → Right & Left bundle branches → Z →Ventricles

What is Y and Z ?

• Y: Bundle of Her

  Z: Purkinge fibres

• Y: Purkinje fibres

  Z: Bundle of His

• Y: Bundle of His

  Z: Purkinje fibres

• Y: Bundle of His

  Z: Purkinge fibres

There are 2 heart sounds which are "lub" and "dup". Choose the correct statement that best describe the sound.

• "lub" produced by recoil of blood against the closed semilunar valves

• "dup" produced by recoil of blood against the closed AV valves

• "lub" produced by vibrations caused by closing of the semilunar valves

• "dup" produced by vibrations caused by closing of the semilunar valves

ECG is represented by PQRST wave. What happen during QRS complex?

• Atria contract

• Depolarization of ventricles

• Ventricles relax

• Repolarization of atria

Which one is NOT a function of lymphatic system?

• Carry out immune response

• Transport amino acids

• Drains excess interstitial fluid

• Transport dietary lipids