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What sound does a human heart make?
lup - dup (when the valves between the atria and venticles close, the "lup" sound is made. When the valves between the venticles and blood vessels close, the "dup" sound is made).
In longitudinal section how do the walls of the atria and ventricles differ?
In longitudinal section, the walls of the atria are thinner, and lined with pestinate muscles. The walls of the ventricles, meanwhile, are thick and muscular.
Are the left and right venticles 2 of the superior chambers of the heart?
no, the superior chambers of the heart refer only to the left and right atria. the left and right ventricles would be considered the inferior chambers of the heart.
Why have the ventricles got thicker walls then the atria?
atria are just the receiving chambers, it is the ventricles that actually pump the blood into the pulmonary and systemic circuits
Functions of the atria?
They have thin walls and they collect blood before it enters the ventricles.
What is secreted by cells in the walls of the hearts atria?
atrial natriuretic hormone (ANH)
Which walls are thicker those of the atria or those of the ventricle and why?
The ventricle walls are thicker. The blood is being ejected outside of the ventricla
What are venticles?
valves in the heart
Why the atria walls so thin?
Atria don't do nearly the same amount of work of contraction as do the ventricles. They are therefore relatively thin walled. Most of the blood that flows from the atria to the ventricles flows passively, and so the atria function mostly as a reservoir for blood volume.
Why are the walls of the ventricle thicker than the walls of the atria?
The ventricle wall is thicker as it needs to pump blood from the heart to other parts of the body and so it has more pressure than the ventricle walls.
What is internodal pathway?
It is a pathway for signals from the SA node to the AV node that passes through the walls of the atria.
What part of the frog's heart is thicker?
The wall of the ventricle is thicker than the walls of the atria because the ventricle pumps blood throughout the body, and the wall of the ventricle needs to be thick snd muscular in order to do so.
