Q: Which equation best represents the filtration rate in the nephron, and what does each variable stand for?

$$GFR = K_f \times (P_{GC} - P_{BS} - \pi_{GC})$$ where $$K_f is $$the filtration coefficient, $$P_{GC} is $$glomerular capillary pressure, $$P_{BS} is $$Bowman’s space pressure, and $$\pi_{GC} is $$glomerular oncotic pressure.

Question 1

Which of the following best describes the primary function of the spleen in adult humans?

Accepted Answer

It filters blood, removes old erythrocytes, and participates in immune responses.

Question 2

A patient presents with hypertension and hypokalemia. Which layer of the adrenal cortex is most likely overactive, and what hormone does it primarily secrete?

Accepted Answer

Zona glomerulosa; secretes aldosterone.

Question 3

Which equation best represents the filtration rate in the nephron, and what does each variable stand for?

Accepted Answer

$$GFR = K_f 	imes (P_{GC} - P_{BS} - \pi_{GC})$$ where $$K_f is $$the filtration coefficient, $$P_{GC} is $$glomerular capillary pressure, $$P_{BS} is $$Bowman’s space pressure, and $$\pi_{GC} is $$glomerular oncotic pressure.

Question 4

The juxtaglomerular complex is crucial for regulating blood pressure. Which mechanism does it use to accomplish this?

Accepted Answer

It releases renin, which activates the renin-angiotensin-aldosterone system (RAAS) to increase blood pressure.

Question 5

Which of the following best describes the blood supply and venous drainage of the kidney?

Accepted Answer

Renal arteries supply blood; renal veins drain blood into the inferior vena cava.

Question 6

Which nerve is NOT part of the lumbar plexus?

Accepted Answer

Sciatic nerve

Question 7

A woman presents with severe pelvic pain and infertility. Imaging reveals ectopic endometrial tissue. What is the most likely diagnosis and its clinical significance?

Accepted Answer

Endometriosis; ectopic endometrial tissue causing pain and infertility.

Question 8

Which muscles form the lateral wall of the pelvis?

Accepted Answer

Obturator internus and piriformis

Question 9

Which of the following is a major anatomical difference between the male and female pelvis?

Accepted Answer

The female pelvis has a wider pelvic inlet and a broader subpubic angle.

Question 10

During the menstrual cycle, which hormone peaks just before ovulation, and what is its primary effect?

Accepted Answer

Estrogen; triggers the LH surge leading to ovulation.

Question 11

Which part of the nephron is primarily responsible for reabsorbing glucose, and what transport mechanism is used?

Accepted Answer

Proximal convoluted tubule; uses sodium-glucose co-transport ($$SGLT)$$

Question 12

Which of the following correctly lists the four parts of the male urethra in order from proximal to distal?

Accepted Answer

Prostatic, membranous, spongy (penile), external

Question 13

Which structure stores sperm and facilitates their maturation, and where is it located?

Accepted Answer

Epididymis; located on the posterior aspect of the testis

Question 14

Which of the following best describes the mechanism of erection in males?

Accepted Answer

Parasympathetic stimulation causes vasodilation of penile arteries, increasing blood flow to erectile tissue.

Question 15

A patient with a tumor in the zona fasciculata of the adrenal cortex is most likely to experience which symptoms?

Accepted Answer

Increased cortisol production leading to hyperglycemia and immunosuppression.

Question 16

Which of the following best explains the role of the renin-angiotensin-aldosterone system (RAAS) in regulating blood pressure?

Accepted Answer

Renin converts angiotensinogen to angiotensin I, which is then converted to angiotensin II, causing vasoconstriction and aldosterone release.

Question 17

Which equation best represents the relationship between blood flow ($$Q$$), pressure difference ($$\Delta P$$), and resistance ($$R) in $$the renal vasculature?

Accepted Answer

$$Q = \frac{\Delta P}{R}$$

Question 18

During emission and ejaculation, which nervous system is primarily responsible for each phase?

Accepted Answer

Emission is controlled by the sympathetic nervous system; ejaculation is controlled by the somatic nervous system.

Question 19

A patient with multiple leiomyomas is most likely to experience which clinical symptoms?

Accepted Answer

Heavy menstrual bleeding and pelvic pressure due to benign smooth muscle tumors.

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