– Heart rate increases initially due to parasympathetic withdraw followed by sympathetic activation
श्रेणी: APK Quiz 3
What would happen if the SA node were removed from the heart?
the heart would still contract b/c the AV node would initiate contraction – the heart rate at rest would decrease b/c the AV node would initiate contraction
Examples of ventilatory control
– Increasing expiration due to detection of arterial hypoxia, – receiving input from neurons to contract the diaphragm – afferent sensory information to stimulate breathing controls
What determines friction b/t blood and internal vascular wall resistance?
– blood vessel radius – blood thickness/ viscosity
what are the mechanics of air movement into the lungs during inspiration?
an increase in lung volume and decrease in intrapulmonary pressure allows ambient air to travel into the lungs
What are the three primary variables that affect stroke volume?
– afterload – preload – contractility
Increasing the end-diastolic volume (preload) will cause
– stretching of the myocardium – increasing strength of ventricular contraction – increasing volume of blood ejected during systole
The conduction of the heart muscle in a healthy person occurs in what order
> SA node > AV node > bundle of HIS > purkinje
I took a drug that substantially increased the thickness of my lung alveoli outer membrane. What best describes the consequence of this drug during maximal exercise and why?
– The drug will decrease the amount of oxygen that I can diffuse into my lung per breath because the rate of diffusion will be slower due to the increased thickness
Electrode configuration for a 12-lead ECG
– the right and left leg electrodes are attached to the right and left sides of the trunk below the rib cage – the right and left arm electrodes are placed below…