Activity 7.11 Conductive pathway of the heart

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A7.11S
Student
Activity 7.11 Conductive pathway of the heart
Purpose
•
To describe the normal electrical activity of the heart during a single heartbeat.
Procedure
Read your textbook and watch the interactive tutorial for Activity 7.11 before completing this sheet.
1
Fill in the gaps to correctly identify the major parts of the heart’s conduction system.
2
Draw an arrow to show the path taken by the wave of depolarisation as it spreads across the atria.
3
Draw arrows to show the route of the electrical impulse as it travels through the ventricles.
4
Draw arrows to show the direction of blood flow at the entry to each of the blood vessels of the heart.
Colour-code your arrows to show oxygenation, red for oxygenated and blue for deoxygenated.
Figure 1 The conductive pathways of the heart.
Q1 Why is there a non-conducting layer between the atria and ventricles?
Q2 Why are impulses conducted to the base of the heart before moving up through the ventricle walls?
Q3 Where are impulses temporarily delayed within the conduction system?
Q4 Why are these impulses delayed?
Salters-Nuffield Advanced Biology, Pearson Education Ltd 2009. © University of York Science Education Group.
This sheet may have been altered from the original.
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