Explain the pathway of the conductions system in the Heart?don't copy from google

The rapid depolarization phase of heart pacemaker cells is caused by which of the following? movement of Na+ through funny channels movement of Ca++ through L-type channels movement of Na+ and Ca++ through funny channels movement of K+ through funny channels all of the above

I need to calculate the approximate heart rate based on the given ECG results, but I can't get how to determine the length of time between two consecutive R waves. What I see, it's one second between the two highest waves (I suppose they are R waves). But it means the heart rate should be 60 beats per minute, but there is no option for this answer. Teach me how to determine correctly the length of time between two consecutive R waves.

The pointy, inferior part of the heart is the ___while the ___ is much broader with multiple blood vessels entering and exiting from the region.

George Esposito is a 79-year-old male admitted to a medical ward. George was taken to the emergency department by his daughter following a fall at home. George tells the staff it was “nothing but a bit of a dizzy spell”. George lives alone and his daughter, Angela describes him as a very private man who prefers his own company. George owns his own small weatherboard home on a small farm. He has tank water only at the property. He has a vegetable garden, three chickens and his Jack Russel dog, Bella. George and Bella are inseparable. George enjoys watching sport and news programs on television, loves a good strong cup of black tea with three teaspoons of sugar and chocolate biscuits. He likes to get up early and go to bed early. He does not like the recent hot weather. Angela visits once a week and has been dropping off his meals, but she reports he says that he has not been eating them recently because he is not hungry, and things seem to get stuck in his throat. She notes her father…

Compare and contrast the structure of the heart wall with that of arteries. Which three structures are homologous?

A likely effect of parasympathetic input to the heart would be to _____.     Open additional potassium channels in pacemaker cells     Promote calcium entry in pacemaker and contractile cells     There is no parasympathetic input to the heart     Decrease force of ventricular contraction

Why is SA node called pace-maker of the heart?

Given the role of potassium in myocardial cell action potentials, explain how hyperkalemia can stop the heart. Make sure to explain in terms of ion movements

‘The heart is adapted to ensure that blood flows in a controlled direction’ (as illustrated by the light purple and blue arrows positioned in Figure 2). Discuss this statement taking into account: • the stages of the cardiac cycle, • the electrical conductivity series, • the role of named valves.