The ability of muscles to exert a force one time is called

a.) muscular weakness
b.) muscular endurance
c.) muscular reaction
d.) muscular strength

equal distribution i think.

blood enters the heart through two large veins, the inferior and superior vena cava, emptying oxygen-poor blood from the body into the right atrium of the heart. as the ventricle contracts, blood leaves the heart through the pulmonic valve, into the pulmonary artery and to the lungs where it is oxygenated.