The essential functions of the digestive system are to (select all that apply):
a. add nutrients to food.
b. put food into a form that can be transferred into circulation.
c. filter waste products from the blood.
d. transfer digested food into circulation.
e. retain undigested food and eliminate it from the body.
Contrary to popular belief, urine normally has no bacteria in it at all. Indeed, the movement of urine down the urinary tract is one reason the kidneys and the bladder tend to stay free from infection—the flow of urine washes away any encroaching bacteria. Keeping this and the difference between male and female urethras in mind, why is it that women are more prone to bladder infections than men?
In addition to filtering waste from the body, what are two other critical functions of the kidneys?
a. storage of blood, distribution of nutrients
b. production of urea, production of hemoglobin
c. regulation of blood volume, conservation of useful materials
d. production of hemoglobin, channeling of lymphatic fluid
e. storage of nutrients, regulation of digestive system