DP Biology (first assessment 2025)

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Question 23M.2.HL.TZ2.6b

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Date May 2023 Marks available [Maximum mark: 4] Reference code 23M.2.HL.TZ2.6b
Level HL Paper 2 Time zone TZ2
Command term Outline Question number b Adapted from N/A
b.
[Maximum mark: 4]
23M.2.HL.TZ2.6b
(b)

Outline the role of the right atrium in the cardiac cycle.

[4]

Markscheme
  1. right atrium collects (deoxygenated) blood from the body;
  2. blood drains into atrium through/from the vena cava;
  3. deoxygenated blood present in vena cava/right atrium/right ventricle;
  4. right atrium pumps blood into the right ventricle;
  5. during atrial systole/ventricular diastole/at the start of the cardiac cycle;
  6. sinoatrial node is in the right atrium/sinoatrial node acts as the (natural) pacemaker / sinoatrial node initiates the heartbeat;
  7. SA node sends out electrical signal to stimulate contraction in the (walls of the) atria/then propagated to the AV node / (walls of the) ventricles;

 

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