The Cardiovascular & Respiratory System Flashcards
What is the effect and mechanism of calcium channel blockers on heart rate?
The heartbeat slows because repolarization slows
What is the function of the Purkinje fiber system?
It picks up the impulses and carries them from the bundle of HIS up into the right and left ventricular myocardium
Lipids in the lungs called _____ decrease the surface tension in the lungs, make it easier for the lungs to expand, and keep the alveoli from collapsing during lung expansion.
Surfactants
What is the structure that covers the opening to the respiratory system when swallowing food or liquid?
Epiglottis
What’s the function of the nares?
Intake of air
Where do electrical impulses in the heart begin?
The sinoatrial node
The amount of blood ejected from the left ventricle in one contraction is called the:
Stroke volume
The _____ is a sac that surrounds the heart.
Pericardium
Which term means that one or more heart valves don’t completely open?
Valvular stenosis
Where are the intercostal muscles located?
Between the ribs
In which heartbeat phase are the cardiac muscle cells relaxed?
Diastole
The major arteries located closest to the heart are what type of artery?
Elastic
What’s the function of intercalated discs?
They connect heart muscle cells end to end
Which part of an electrocardiogram corresponds with the contraction of the atria?
P wave
What’s the purpose of panting?
Lose heat
