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Questions and Answers

What is the primary role of the urinary system?

  • Stimulation of erythrocyte production
  • Excretion of metabolic wastes and excess water (correct)
  • Conversion of vitamin D to its active form
  • Regulation of blood pressure

Which substance is secreted by the kidneys for the regulation of blood pressure?

  • Angiotensin I
  • Calcitriol
  • Renin (correct)
  • Erythropoietin

What is the temporary storage organ for urine in the urinary system?

  • Bladder (correct)
  • Ureters
  • Urethra
  • Kidneys

Which function of the kidneys is NOT mentioned in the text?

<p>Excretion of bile (D)</p> Signup and view all the answers

What stimulates erythrocyte production in red marrow?

<p>Erythropoietin (B)</p> Signup and view all the answers

What is the function of the juxtaglomerular apparatus?

<p>Regulation of blood pressure (C)</p> Signup and view all the answers

Which cells form the visceral layer of Bowman's capsule?

<p>Podocytes (C)</p> Signup and view all the answers

During which physiological condition would the kidneys engage in gluconeogenesis?

<p>During periods of prolonged fasting (C)</p> Signup and view all the answers

Where does ultrafiltrate leave the renal corpuscle?

<p>At the renal pole (B)</p> Signup and view all the answers

What is the role of mesangial cells in the glomerulus?

<p>Supporting glomerular capillaries (D)</p> Signup and view all the answers

Which cells form the parietal layer of Bowman's capsule?

<p>Simple squamous cells (C)</p> Signup and view all the answers

Where is the juxtaglomerular apparatus located?

<p>Where the DCT contacts the afferent arteriole (C)</p> Signup and view all the answers

What is the main function of mesangial cells in the glomerulus?

<p>Structural support to podocytes and vessels (C)</p> Signup and view all the answers

What type of epithelium is present in the walls of the proximal tubule?

<p>Columnar epithelium (B)</p> Signup and view all the answers

Which segment of the Loop of Henle is permeable to water but not solutes?

<p>Descending segment (B)</p> Signup and view all the answers

What is the main difference between the straight part and convoluted part of the Distal Convoluted Tubule (DCT)?

<p>Expansion in diameter occurs only in the convoluted part (A)</p> Signup and view all the answers

Which cell type forms the Macula Densa in contact with the Glomerulus?

<p>Low cuboidal cells (C)</p> Signup and view all the answers

What is the main function of the juxtaglomerular cells?

<p>Produce and secrete renin (A)</p> Signup and view all the answers

What is the function of extraglomerular mesangial cells in the juxtaglomerular apparatus?

<p>Produce ultrafiltrate (A)</p> Signup and view all the answers

Which cellular component of the juxtaglomerular apparatus contacts the glomerulus forming a specialized section of tubular epithelium called macula densa?

<p>Macula densa (A)</p> Signup and view all the answers

What is the role of renin in the context of the juxtaglomerular apparatus?

<p>Convert angiotensinogen to angiotensin (C)</p> Signup and view all the answers

How do juxtaglomerular cells influence blood pressure?

<p>By converting angiotensinogen to angiotensin (B)</p> Signup and view all the answers

What differentiates extraglomerular mesangial cells from juxtaglomerular cells in the juxtaglomerular apparatus?

<p>Surrounded by a thick BL (A)</p> Signup and view all the answers

What type of epithelium is characteristic of the male urethra at the external urethral orifice?

<p>Stratified squamous (A)</p> Signup and view all the answers

Which layer of the urethra contains cavernous tissue spaces typical of erectile tissue?

<p>Tunica submucosa (A)</p> Signup and view all the answers

What is the name of the muscle that the urethra acquires towards the external urethral orifice?

<p>Striated urethralis muscle (A)</p> Signup and view all the answers

In females, what type of epithelium characterizes the urethra?

<p>Stratified squamous (A)</p> Signup and view all the answers

Where does the spongy (penile) urethra extend from?

<p>Membranous urethra to external urethral orifice (C)</p> Signup and view all the answers

What is the function of mucus in the urinary bladder?

<p>To prevent cells from being contacted by urine (B)</p> Signup and view all the answers

Which type of muscle forms the internal urethral sphincter?

<p>Circular smooth muscle fibers (A)</p> Signup and view all the answers

What is the role of the serosa/adventitia layer in the urinary bladder?

<p>Anchors the bladder in place (C)</p> Signup and view all the answers

How many tissue layers compose the wall of the urinary bladder?

<p>Four (D)</p> Signup and view all the answers

What is the significance of the circular smooth muscle fibers in the urinary bladder?

<p>Form internal urethral sphincter (B)</p> Signup and view all the answers

The prostatic urethra is enclosed in the penile gland.

<p>False (B)</p> Signup and view all the answers

The membranous urethra extends from the prostatic urethra to the external urethral orifice.

<p>False (B)</p> Signup and view all the answers

In both males and females, the urethra starts out as stratified squamous epithelium.

<p>False (B)</p> Signup and view all the answers

The male urethra always remains lined with stratified squamous epithelium.

<p>False (B)</p> Signup and view all the answers

The female urethra contains cavernous tissue spaces in its submucosa.

<p>False (B)</p> Signup and view all the answers

The female urethra acquires an external layer of skeletal muscle called striated urethralis muscle towards the external urethral orifice.

<p>False (B)</p> Signup and view all the answers

In the male urethra, the wall has three tissue layers: tunica mucosa, tunica submucosa, and tunica muscularis.

<p>False (B)</p> Signup and view all the answers

The penile urethra is also known as the spongy urethra.

<p>True (A)</p> Signup and view all the answers

The membranous urethra is a long section that extends into the penis.

<p>False (B)</p> Signup and view all the answers

The male urethra starts as stratified squamous but changes to transitional cell epithelium at the external urethral orifice.

<p>False (B)</p> Signup and view all the answers
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