A)Renin is secreted by the juxtaglomerular cells of the kidney when blood pressure rises too high.
B)One function of angiotensin II is to increase vasoconstriction.
C)The secretion of aldosterone is increased by angiotensinogen.
D)The renin-angiotensin mechanism is a negative feedback mechanism.

A)If body fluids become too acidic, the kidneys will secrete H⁺ ions into the renal filtrate.
B)Kidney cells can obtain H⁺ ions from the reaction of CO₂ and H₂O to form carbonic aciD.
C)The bicarbonate buffer system is a mechanism for the kidneys to get rid of excess H⁺ ions and thereby lower the pH of body fluids.
D)The kidneys help maintain the normal pH range of blood of 7.30 to 7.40.

A)Peristalsis of the ureters is the function of their smooth muscle.
B)The spherical detrusor muscle is smooth muscle that forms the wall of the bladder.
C)In men, the urethra passes through the prostate gland and penis.
D)The internal urethral sphincter is striated muscle at the junction of the bladder and urethra.
E)The transitional epithelium of the bladder absorbs water to concentrate the urine
F)The external urethral sphincter is striated muscle that is under parasympathetic control.