The Structure of the Mammalian Heart
-the heart consists of two muscular pumps that maintains the circulation.
-it is mainly composed of cardiac muscle.
-the specialized tissue is capable of rhythmic contractions which occur automatically and without getting tired, aka myogenic.
-cardiac muscle has a rich supply of blood vessels, supplied by the coronary arteries.
-cardiac muscle contains connective tissue to provide strength.
-the left ventricle has a thicker/more muscular wall than the right ventricle, because it needs to contract powerfully to pump blood further (lungs vs. body).
-the ventricles have thicker walls than the atria, because they have to push blood further.
-the AV valves only let blood go from the atria to the ventricles.
-the SL valves only let blood go from the ventricles to the pulmonary artery and aorta.
-difference of pressure between valves causes valves to open or close.
-if the pressure is higher behind the valve= forced open.
-if pressure is higher in front of the valve = forced closed.
-it is mainly composed of cardiac muscle.
-the specialized tissue is capable of rhythmic contractions which occur automatically and without getting tired, aka myogenic.
-cardiac muscle has a rich supply of blood vessels, supplied by the coronary arteries.
-cardiac muscle contains connective tissue to provide strength.
-the left ventricle has a thicker/more muscular wall than the right ventricle, because it needs to contract powerfully to pump blood further (lungs vs. body).
-the ventricles have thicker walls than the atria, because they have to push blood further.
-the AV valves only let blood go from the atria to the ventricles.
-the SL valves only let blood go from the ventricles to the pulmonary artery and aorta.
-difference of pressure between valves causes valves to open or close.
-if the pressure is higher behind the valve= forced open.
-if pressure is higher in front of the valve = forced closed.