Chapter 19 Flashcards


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Some of the interactive Homework Questions
updated 3 years ago by Radcliffe_1970
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ap biology, biology 211
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1

When atrial pressure is greater than ventricular pressure, the---- valves open.

AV

2

When ventricular pressure rises above atrial pressure, the blood in the ventricle pushes the----- valves closed.

AV

3

when the pressure in the --------- is greater than the pressure in the arteries, the semilunar valves are forced open.

ventricles

4

When ventricular pressure is lower than -------pressure, arterial blood holds the semilunar valves closed.

arterial

5

P wave

Atrial depolarization

6

QRS complex or

Ventricular depolarization

7

T wave

Ventricular repolarization

8

PQ segment

Atrial contraction or atrial systole

9

ST segment

Ventricular contraction or ventricular systole

10

Place the locations of the heart's conducting system in order, beginning with the location where the heartbeat is initiated.

SA Node

AV Node

AV bundle

Left and right bundle branches

Purkinje fibers

11

Name all that occur during ventricular systole.

  • The AV valves open to allow blood to enter the ventricles from the atria.
  • The semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles.
  • The semilunar valves open to allow blood to flow into the large arteries.
  • The AV valves close to prevent backflow of blood into the atria.

12

During the depolarization phase of cardiac muscle?

voltage-gated sodium channels open.

13

Put the steps of the cardiac cycle into the correct order, starting with the beginning of the cardiac cycle.

Atrial contraction and ventricular filling

Isovolumetric contraction

Ventricular ejection

Isovolumetric relaxation

Atrial relaxation and ventricular filling