BION 3202

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BION 3202

• Lecture 3. Contraction of Heart Tissue

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Figure 14-11 - Overview
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Figure 14-11, step 1
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Figure 14-11, step 2
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Figure 14-11, step 3
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Figure 14-11, step 4
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Figure 14-11, step 5
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Figure 14-11, step 6
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Figure 14-11, step 7
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Figure 14-11, step 8
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Figure 14-11, step 9
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Figure 14-11, step 10
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Nature 415, 198-205 (10 January 2002) doi
10.1038/415198a Cardiac excitation-contraction
coupling Donald M. Bers
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Which of the following phases of a muscle twitch
requires ATP?

• latent period
• contraction period
• relaxation period
• B and C
• A, B, and C

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In skeletal muscle, the Ca2 for contraction
comes from

• mitochondria
• extracellular fluid
• sarcoplasmic reticulum
• B and C
• A, B, and C

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In myocytes, the Ca2 for contraction comes from

• mitochondria
• extracellular fluid
• sarcoplasmic reticulum
• B and C
• A, B, and C

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A drug that blocks ICa,L is expected to have what
effect on contraction strength

• Increase
• Decrease
• Do nothing

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Student Presentations
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Next Class Heart Structure

• Chapter 14, pages 465-470
• Sulcus
• Sinus
• Prolapse (valve)
• Occlusion
• Stenosis