Q: During tubular reabsorption, sodium is primarily transported across the basolateral membrane of the tubule cell by which mechanism?

Primary active transport via the Na\textsuperscript{+}/K\textsuperscript{+} ATPase pump

Question 1

Which of the following best describes the myogenic mechanism of renal autoregulation?

Accepted Answer

It is a process where smooth muscle in the afferent arteriole contracts when stretched, helping to maintain a constant glomerular filtration rate (GFR).

Question 2

A patient is experiencing severe blood loss. Which extrinsic control mechanism is most likely to be activated to maintain blood pressure and GFR?

Accepted Answer

Renin-Angiotensin-Aldosterone Mechanism

Question 3

If the sympathetic nervous system is activated, what is the expected effect on glomerular filtration rate (GFR)?

Accepted Answer

GFR decreases due to constriction of afferent arterioles.

Question 4

During tubular reabsorption, sodium is primarily transported across the basolateral membrane of the tubule cell by which mechanism?

Accepted Answer

Primary active transport via the Na	extsuperscript{+}/K	extsuperscript{+} ATPase pump

Question 5

Which of the following best distinguishes obligatory water reabsorption from facultative water reabsorption?

Accepted Answer

Obligatory water reabsorption occurs in the proximal convoluted tubule and descending limb of the nephron loop, while facultative water reabsorption occurs in the collecting duct under the influence of ADH.

Question 6

Which capillaries are primarily responsible for reabsorbing substances from the proximal and distal convoluted tubules?

Accepted Answer

Peritubular capillaries

Question 7

Aldosterone increases sodium reabsorption in which part of the nephron?

Accepted Answer

Distal convoluted tubule and collecting duct

Question 8

Which hormone decreases sodium reabsorption and thus increases sodium excretion in the urine?

Accepted Answer

Atrial natriuretic peptide (ANP)

Question 9

Tubular secretion is important for which of the following reasons?

Accepted Answer

It helps eliminate substances such as potassium and hydrogen ions from the blood into the filtrate.

Question 10

The countercurrent multiplier in the nephron loop (loop of Henle) is responsible for which of the following?

Accepted Answer

Creating the medullary osmotic gradient by actively transporting NaCl out of the ascending limb

Question 11

If a person is overhydrated, what changes would you expect in the secretion of antidiuretic hormone (ADH) and the concentration of urine?

Accepted Answer

ADH secretion decreases and urine becomes more dilute.

Question 12

Which of the following is a nitrogenous waste found in urine that results from the breakdown of amino acids?

Accepted Answer

Urea

Question 13

Urine is transported from the kidneys to the bladder by which process?

Accepted Answer

Peristalsis of the ureters

Question 14

Which muscle is responsible for contraction of the urinary bladder during urination?

Accepted Answer

Detrusor muscle

Question 15

Which of the following statements about the sphincters controlling urination is correct?

Accepted Answer

The internal urethral sphincter is under involuntary control, while the external urethral sphincter is under voluntary control.

Question 16

Which of the following events must occur for urination (micturition) to take place?

Accepted Answer

Contraction of the detrusor muscle and relaxation of both the internal and external urethral sphincters

Question 17

What is the normal pH range of blood in the human body?

Accepted Answer

$7.35 - 7.45$

Question 18

Which of the following best describes the role of the respiratory system in acid-base balance?

Accepted Answer

It regulates the concentration of carbon dioxide, which in turn affects the concentration of hydrogen ions in the blood.

Question 19

A patient with chronic obstructive pulmonary disease (COPD) has elevated blood $\mathrm{CO_2}$ levels. What acid-base disturbance are they most at risk for?

Accepted Answer

Respiratory acidosis

Question 20

Which of the following is a function of the renal system in acid-base balance?

Accepted Answer

Reabsorbing filtered bicarbonate and secreting hydrogen ions into the filtrate

Renal Physiology and Acid-Base Balance: Study Notes for Anatomy & Physiology

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