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Author Question: At what point in the figure do the atrioventricular valves close? a. B c. E b. D d. ... (Read 23 times)

acc299

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on: Jul 16, 2018
At what point in the figure do the atrioventricular valves close?
 
  a. B c. E
  b. D d. F

Question 2

When does the atrial kick begin?
 
  a. Just before atrial systole
  b. During atrial repolarization
  c. During the impulse delay in the atrioven-tricular node
  d. Simultaneously with ventricular excitation


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AngeliqueG

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Reply #1 on: Jul 16, 2018
Answer to Question 1

ANS: C
The atrioventricular valves close at the beginning of ventricular systole. See Figure 9-22.

Answer to Question 2

ANS: C
As the impulse travels through the atrioventricular node, there is a 100-ms delay in conduction. This delay is important because it allows the atria to become fully depolarized and contract be-fore ventricular excitation begins. This allows the atria to contract and empty, which has been dubbed atrial kick, contributing to optimal ventricular filling.


acc299

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Reply 2 on: Jul 16, 2018
Excellent

jojobee318

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Reply 3 on: Yesterday
:D TYSM

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