The hormone "oxytocin" is responsible for milk letdown.
Prolactin
ejection i think
OT - Oxytocin from the posterior pituitary causes milk ejection
mammary glands, sometimes to the point of secreting milk.
mammary glands
Springs, ammuntion, lack of cleaning, parts breakage
Stress usually, or depending on the specific hormones you body produces
Men have breast tissue, but a gene causes the mammary glands to stay dormant.
prolactin - anterior pituitary gland oxytocin - posterior pituitary gland
Hormones
thyroid hormones
Ejection fraction is Stroke Volume/end-diastolic volume. This is a measure of the amount of blood ejected from the left ventricle each beat. Things that can lower this ejection fraction are: Damage to the heart muscle (heartattack) Weak muscle Lack of muscle (dilated cardiomyopathy) Low fluid volume CHF....