Urinary System: CHP 13

Question 1

What is the function of the kidney?

Answer 1

Blood filtering
Filters water and reclaims what body needs
Excretes rest as urine

Question 2

What is the function of the ureter?

Answer 2

Channel for urine flow from kidney to urinary bladder

Question 3

What is the function of the urinary bladder?

Answer 3

Stretchable urine storage organ

Question 4

What is the function of the urethra?

Answer 4

Urine flow channel between urinary bladder and body surface

Question 5

Describe glomerular filtration in the nephron.

Answer 5

Water, salts, nutrients, and waste molecules move inside glomerulus to glomerular capsule.

Question 6

Describe tubular reabsorption in the nephron.

Answer 6

Nutrient/salt molecules are actively reabsorbed from convoluted tubules into peritubular capillary network, and water flows passively.

Question 7

Describe tubular secretion in the nephron.

Answer 7

Molecules are actively secreted from peritubular capillary network into convoluted tubules.

Question 8

Describe the first three steps of the process of micturition.

Answer 8

Urine accumulates, bladder stretches, relflex is sent to begin urination
Stretch receptors send nerve impulses to spinal cord
PS nerve activity causes contraction of detrusor muscle and relaxation of internal urethral sphincter

Question 9

Describe the last three steps of micturition.

Answer 9

Spinal cord inhibits motor neurons and causes external urethral sphincter to relax
Urination occurs
Nerve impulses can voluntarily contract external urinary sphincter, delaying passage of urine through urethra

Question 10

What enzyme is secreted to balance blood pressure?

Answer 10

Renin

Question 11

How is blood volume regulated?

Answer 11

Returning water to the blood and eliminating water through urine

Question 12

How is blood pH regulated?

Answer 12

Through blood ion levels
(Hydrogen ions and bicarbonate ions)