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Unit 1 Chapter 19

Quiz 1 wrong

QuestionAnswer
When the aortic semilunar valve closes and blood bounces off of it, it produces the _________blank heart sound that is ultimately related to when the _________blank. dupp (S2); ventricles relax
True or False The cardiac plexus and cardiac nerves dominate the innervation of the heart and contain both parasympathetic and sympathetic fibers. True
True or False If the SA node is damaged, nodal rhythm is sufficient to sustain life. True
True or False Desmosomes form channels that allow each cardiomyocyte to electrically stimulate its neighbors. False
When sodium channels are fully open, the membrane of the ventricular cardiomyocyte _________blank. sharply depolarizes
Which of the following blood vessels receives blood directly from the right ventricle? Pulmonary trunk Ascending aorta Superior vena cava Inferior vena cava Right pulmonary vein Pulmonary trunk
True or False Hypercapnia and acidosis have positive chronotropic effects. True
The _________blank provides most of the Ca2+ needed for myocardial contraction. sarcoplasmic reticulum
The volume of blood ejected by each ventricle in one minute is called the _________blank. cardiac output
True or False Under normal conditions, the amount of blood pumped through the pulmonary circuit is less than the amount pumped through the systemic circuit. False
The area where the major vessels lead to and from the heart's chambers is called the _________blank of the heart. The pointy, inferior portion is called the _________blank. base; apex
True or False The pulmonary circuit is supplied by both the right and the left sides of the heart. False
Oxygen-poor blood passes through the _________blank. right AV and pulmonary valves
Atrial systole begins _________blank. During the P wave.
When the ventricles relax, the _________blank valve prevents backflow of blood into the left ventricle. aortic
True or False The fibrous skeleton of the heart serves as electrical insulation between the atria and the ventricles. True
The Frank-Starling law of the heart states that stroke volume is proportional to _________blank. the end-diastolic volume
Cardioinhibitory centers in the _________blank receive input from _________blank. medulla oblongata; chemoreceptors in the aortic arch
Which of the following belong to the pulmonary circuit? Pulmonary arteries and pulmonary veins
Created by: Gluis5974
 

 



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