A)blood will not clot in veins
B)the blood pressure in veins is so low that rupture is unlikely
C)it has to help prevent backflow of blood
D)blood pressure is high in veins

A)If more blood returns to the heart, the ventricles contract more forcefully to pump it out, and this raises BP.
B)The hormone ADH helps the kidneys conserve water and helps prevent a decrease in BP.
C)The elasticity of the large arteries helps decrease diastolic BP.
D)If BP decreases, filtration in the kidneys decreases.
E)Aldosterone stimulates the reabsorption of Na⁺ ions by the kidneys, which lowers BP.
F)If BP decreases, the kidneys secrete the enzyme renin, which stimulates the secretion of epinephrine to prevent a further decrease.
G)Norepinephrine stimulates vasoconstriction in skin, viscera, and skeletal muscles, all of which lower BP.
H)The hormone ANP increases the excretion of K⁺ ions by the kidneys, which helps conserve water and raise BP.

A)This pathway of circulation begins at the right ventricle and ends at the right atrium.
B)Blood pressure in the pulmonary capillaries is 30 to 35 mmHg.
C)Gas exchange in the pulmonary capillaries depends on the process of filtration.
D)The pulmonary veins return oxygenated blood to the right atrium.
E)None are correct.