These ions diffuse in the cell membrane of the heart causing depolarization which is critical in the production of contractions of cardiac muscle.
B) sodium ions
These vessels carry blood from the body to the right atrium.
superior vena cava and inferior vena cava
This vessel carries blood to the rest of the body
aorta
Identify the parts of the heart (valves and other structures):
1. aortic semilunar valve
2. coronary sinus
3. tricuspid valve
4. pulmonary semilunar valve
5. bicuspid (mitral) valve
6. papillary muscles
7. interventricular septum
Identify the parts of the heart (chambers and vessels):
1. branches of right pulmonary artery
2. right atrium
3. right ventricle
4. aortic arch
5. left pulmonary veins
6. pulmonary trunk
7. left atrium
8. left ventricle
Which of the following is correct regarding heart sounds?
C) The first heart sound occurs at the beginning of ventricular systole.
Which of the following represents the correct sequence for the generation and conduction of an action potential through the conduction system?
D) SA node, AV node, AV bundle, bundle branches, Purkinje fibers
These vessels carry blood from the lungs to the left atrium
pulmonary veins
This is the middle layer of the heart composed of cardiac muscle cells
myocardium
The walls of the right ventricle is thicker than the wall of the left ventricle
False
Which of the following layers forms the majority of the thickness of the heart wall?
C) Myocardium
Sympathetic effects of the ANS to the heart causes the heart rate to ___. While parasympathetic effects causes the heart rate to ____.
increase; decrease
The right atrium receives blood from these openings.
coronary sinus, superior vena cava, inferior vena cava
Both atria contract at the same time and both ventricles contract at the same time.
True
The heart works as two pumps, one on the right and one on the left, working simultaneously.
Contractions of the heart generate blood pressure, which is responsible for moving blood through the blood vessels.
True
The valves of the heart allow blood to flow in different directions through the heart based upon the pressure differences from the pulmonary and systemic circulations.
False
The rate and force of heart contractions change to meet the metabolic needs of the tissues which can vary based on different conditions.
True
These vessels carry blood to the lungs
pulmonary arteries
When the ventricles contract, the ____ pressure within the ventricles forces the semilunar valves to ____.