HL 2 Biology

6.2a: The Transport System

DBQ: Heart Action and Blood Pressure (p.220)

1) 0.0–0.1 sec

2) 0.1 sec

3) 0.1 sec

4) 0.15 sec

5) 0.4 sec

6) 0.15-0.4 sec

7) (a) 0.1 sec

(b) 0.35 sec

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One thought on “6.2a: The Transport System

  1. Grade 7 A consistent and thorough understanding of the required knowledge and skills, and the ability to apply them almost faultlessly in a wide variety of situations. Consistent evidence of analysis, synthesis and evaluation is shown where appropriate. The student consistently demonstrates originality and insight and always produces work of high quality.

    DBQ: heart action and blood pressures
    page 220
    1 Blood is pumped from atria to ventricles 0 seconds to 0.1 seconds (N.B the slight rise in atrial pressure at 0.15 seconds is probably due to the AV valve bulging back into the atria as ventricular systole starts.)
    2 Ventricles start to contract at 0.10 seconds.
    3 AV valve closes at 0.1 seconds (atrial pressure falls below ventricular pressure).
    4 SL valve opens at 0.15 seconds (ventricular pressure rises above arterial pressure).
    5 SL valve closes at 0.4 seconds (ventricular pressure falls below arterial pressure).
    6 Blood is pumped from the ventricle to the artery from 0.15 to 0.4 seconds.
    7 a Blood in the ventricle is at a maximum at 0.1 seconds (just before the SL valve opens).
    b Blood in the ventricle is at a minimum at 0.35 seconds (at the peak of ventricular systole).

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