Exam 19: The Circulatory System: Heart

An extended period of time between the P wave and the QRS complex may indicate which of the following?

Oxygen-poor blood passes through the _________.

If the SA node is damaged,nodal rhythm is sufficient to sustain life.

The heart is located in the space called the __________.

Cardioinhibitory centers in the __________ receive input from __________.

Cardiac muscle can only use glucose as a source of organic fuel.

Which of the following blood vessels receives blood directly from the right ventricle?

The long plateau in the action potential observed in cardiomyocytes is probably related with __________ staying longer in the cytosol.

The __________ valve regulates the flow of blood between the right ventricle and the vessels leading to the lungs.

Obstruction of the ___________ will cause a more severe myocardial infarction (MI)than the obstruction of any of the others.

The cardiac plexus and cardiac nerves dominate the innervation of the heart and contains both parasympathetic and sympathetic fibers.

Most of the ventricle filling occurs __________.

Which of the following is the most superficial layer enclosing the heart?

The shallow depression seen on the external surface of the heart between the left and right ventricles is called the __________.

Which is the correct path of an electrical excitation from the pacemaker to a cardiomyocyte in the left ventricle (LV)?

Stroke volume is increased by __________.

The __________ carry blood toward the lungs.

Which of the following is not part of the cardiac conduction system?

The __________ provides most of the Ca²⁺ needed for myocardial contraction.

Hypercapnia and acidosis have positive chronotropic effects.