Q: Which of the following equations correctly represents the calculation of net filtration pressure (NFP) in the glomerulus?

$$\text{NFP} = (P_{GC} - P_{BC} - \pi_{GC})$$

Question 1

A patient presents with muscle weakness, cardiac arrhythmias, and flattened T waves on an ECG. Laboratory tests reveal a plasma potassium concentration of 2.5 mEq/L. Which of the following best explains the physiological consequences of this condition?

Accepted Answer

Hypokalemia decreases the resting membrane potential, making cells less excitable.

Question 2

Which hormone is primarily responsible for increasing water reabsorption in the kidneys, and what is its main mechanism of action?

Accepted Answer

Antidiuretic hormone (ADH); inserts aquaporins into the collecting duct, directly increasing water reabsorption.

Question 3

A marathon runner collapses after the race and is found to have confusion, nausea, and seizures. Laboratory results show low plasma sodium and low plasma osmolality. Which condition is most likely, and what is the underlying cause?

Accepted Answer

Hyponatremia due to hypotonic hydration from drinking large amounts of water without electrolyte replacement.

Question 4

Which of the following equations correctly represents the calculation of net filtration pressure (NFP) in the glomerulus?

Accepted Answer

$$	ext{NFP} = (P_{GC} - P_{BC} - \pi_{GC})$$

Question 5

A patient with chronic obstructive pulmonary disease (COPD) has the following arterial blood gas values: pH = 7.32, $$P_{CO_2$} = 55 $$mmHg, $$HCO_3$$^-$$ = 28 mEq/L. Which acid-base disorder is present, and what compensation is occurring?

Accepted Answer

Respiratory acidosis with renal compensation.

Question 6

Which of the following best describes the role of the sodium-potassium pump ($$Na^+/K^+-$$ATPase) in maintaining fluid and electrolyte balance?

Accepted Answer

It actively transports 3 $$Na^+$$ ions out of the cell and 2 $$K^+$$ ions into the cell, maintaining osmotic balance and cell volume.

Question 7

Which of the following is a correct sequence for the path of sperm from production to ejaculation?

Accepted Answer

Seminiferous tubules → epididymis → ductus deferens → ejaculatory duct → urethra

Question 8

Which hormone is secreted in response to increased blood volume and atrial stretch, and what is its effect on the nephron?

Accepted Answer

Atrial natriuretic peptide (ANP); decreases sodium reabsorption, increasing sodium and water excretion.

Question 9

A patient with untreated type 1 diabetes mellitus presents with polyuria, polydipsia, and glycosuria. Which physiological mechanism best explains the polyuria?

Accepted Answer

Increased glucose in the filtrate raises osmotic pressure, reducing water reabsorption in the nephron.

Question 10

Which of the following best describes the effect of increased afterload on stroke volume, according to the equation $$SV = EDV - ESV$$?

Accepted Answer

Increased afterload increases ESV, decreasing stroke volume (SV).

Question 11

Which of the following is a function of the liver?

Accepted Answer

Production of bile for emulsification of fats.

Question 12

Which of the following best explains why exhalation at rest is a passive process?

Accepted Answer

It results from elastic recoil of the lungs and thoracic wall.

Question 13

Which of the following best describes the relationship between partial pressure of oxygen ($$P_{O_2$}) $$and hemoglobin saturation, and how is this relationship altered during exercise?

Accepted Answer

As $$P_{O_2$}$$ increases, hemoglobin saturation increases; during exercise, the curve shifts to the right due to increased $$CO_2$$, temperature, and decreased pH.

Question 14

Which of the following is a correct description of the three major chemical buffer systems in the body?

Accepted Answer

Bicarbonate, phosphate, and protein buffer systems; all resist pH changes by binding or releasing $$H^+$$ ions.

Question 15

A patient is experiencing severe hemorrhage. Which of the following best describes the kidney's response to this condition?

Accepted Answer

The kidney activates the renin-angiotensin-aldosterone system to increase sodium and water reabsorption.

Question 16

Which of the following best describes the effect of sympathetic nervous system activation on blood pressure, assuming blood flow remains constant?

Accepted Answer

It increases peripheral resistance, raising blood pressure.

Question 17

Which of the following best describes the difference between cortical and juxtamedullary nephrons?

Accepted Answer

Juxtamedullary nephrons have longer loops of Henle and are essential for producing concentrated urine.

Question 18

Which of the following best explains why the testes are located in the scrotum rather than the abdominal cavity?

Accepted Answer

The scrotum provides a lower temperature necessary for optimal spermatogenesis.

Question 19

Which of the following best describes the effect of aldosterone on the nephron?

Accepted Answer

It increases sodium reabsorption in the distal convoluted tubule and collecting duct, leading to increased water retention.

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