An ECG wave is the electrical signal caused by an action potential in a cardiomyocyte.

During Diastole, pressure inside the ventricle drops to near zero, but pressure inside the aorta only decreases to 80 mmHg. Pressure remains elevated in the aorta because The walls are elastic Blood is flowing so fast Smooth muscles are actively contracting There is resistance to flow

Heart sounds you hear ( lub dupp ) are the sounds the depolarization of SA and AV nodes . True False

Which structure(s) (if any) do NOT produce action potentials (APs)?   SA node   Atrial muscle   AV node   Ventricle muscle   These ALL produce APs

Conduction through which of the following occurs directly after SA node is initiated. -AV node -Atria -Purkinje fibers -SA node -bundle of HIS

Is the following ECG/EKG normal or abnormal? O normal abnormal

In all humans the first three arteries to branch off of the aortic arch are brachiocephalic trunk, left common carotid artery and left subclavian artery.   True False   Fossa ovalis exists in a fetal heart and turns into foramen ovale upon birth.   True False   Atrial muscles contract from the base down, while ventricular muscles contract from the apex upwards.   True False Capillary hydrostatic pressure is higher than the capillary osmotic pressure at the beginning of the capillary, but is lower at the end of the capillary.   True False

If ECG of patient shows a P-wave to P-wave interval time of 720 milliseconds, calculate the heart rate in beats per minute. Unit conversion

You are an erythrocyte in the vena cava. Starting there, trace your route through the heart and back into the systemic circulation by naming, in order, all of the major valves, chambers, and organs you will pass through.

Can you help with number 12   This is not and will not be graded