Transport System Quiz
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Which of the following is TRUE regarding the translocation that occurs at the source and the sieve tube element according to the Pressure Flow hypothesis.
I. Sucrose diffuses from mesophyll cells into the sieve tube element
II. High concentration of sucrose in sieve tube lowers the water potential
III. Water from neighbouring cells enters the sieve tube by osmosis
IV. High hydrostatic pressure is created in the sieve tube
A. I and III
B. III and IV
C. I, II and III
D. II, III and IV
Surgery on the septum in the lower region of the human heart may cause damage to nerve fibers within the septum. Which phase of the cardiac cycle would be directly affected by such damage?
A. Atrial systole
B. Ventricular systole
C. Atrial diastole
D. Ventricular diastole
A recording of the electrical activity of a patient’s heart shows that the atria are contracting regularly and normally, but every few beats the ventricles fail to contract. Which of the following is probably not functioning properly?
A. AV node
B. Semilunar valve
C. SA node
D. AV valve
A condition known as mitral valve regurgitation where blood from ventricle is leaking into the atrium can only be detected by
A. Identifying the sounds produced during atrial systole
B. Identifying the sounds produced during ventricular systole
C. Identifying the sounds produced during atrial and ventricular diastole
D. Identifying the sounds produced during atrial diastole
Which of the following statement is true about heartbeat regulation during vigorous exercise?
A. Cardioinhibitory center is stimulated by medulla oblongata.
B. Norepinephrine is secreted to AV node at the end of parasympathetic nerve
C. Noradrenaline is secreted to SA node at the end of sympathetic nerve.
D. Acetylcholine is secreted to SA node at the end of parasympathetic nerve.
Why a person heart beat rate does not slow down even after he finished running?
A. Chemoreceptor detected pH is higher than normal
B. Hypothalamus detected pH is lower than normal
C. Sympathetic nerve secretes adrenaline
D. There are still left over adrenaline in the bloodstream
Which statement describes movement through a plant in the apoplast pathway?
A. Water moves through the vacuoles.
B. Water moves through the cytoplasm.
C. Water moves through the plasmodesmata.
D. Water moves through the cell wall.
A heart attack patient is suffering blockage in the coronary arteries that branched into arteries supplying the blood to AV node. What is the effect of this blockage the patient’s heart?
A. The AV node caused a prolonged delay in generating impulse.
B. The AV node generate impulse without any delay after SA node.
C. The Ventricles will contract more frequently in each cardiac cycle
D. The atrium will contract slower than normal.
What occurs in the apoplast and symplast pathways?
A. A
B. B
C. C
D. D
FIGURE shows translocation of sucrose based on Pressure Flow Hypothesis. The following statements explain what causes the unloading of sucrose at cell Q EXCEPT?
A. lower osmotic pressure at cell Q compare to sieve tube
B. higher water potential at cell Q
C. higher sucrose concentration in cell P compare to cell Q
D. higher water potential in sieve tube
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