Quiz 6 Flashcards
in the cardiovascular system, what is the pulmonary circuit
The heart pumps a volume of blood into the lungs which after getting oxygenated is transported back to heart. This oxygenated blood is then pumped out of the heart and into the aorta and subsequently into the systemic circulation
The ___ is a hole that connects the atria in mammalian fetus
foramen ovale
why does the hole above exist
to prevent blood flow to the right ventricle of the heart from going to the lungs since the lungs in a fetus do not work in the womb
The purpose of having valves in the cardiovascular system is to
ensure that blood flows in one direction
the function of the pericardial fluid is to
reduces friction between the heart and the pericardium
The term myogenic indicates that the heart muscle is the source of
the electric signal that triggers heart contraction
the flattening of the action potentials of myocardial contractile cells, called the plateau phase, is due to a combination of ___ K+ permeability and ___ Ca2+ permeability
decreasing, increasing
the importance of the plateau phase of the action potential of myocardial cells is in
preventing tetanus
the depolarization of the pacemaker action potential spreads to adjacent cells through
gap junctions
the AV nice is important because it
delays the transmission of the electrical impulses to the ventricles in order for the atria to finish contracting
The QRS complex of an ECG corresponds to
the progressive wave of ventricular depolarization
