Biology Lecture 17: Urinary System Functions
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Questions and Answers

What is the main function of the kidneys?

  • Convert urine into blood
  • Regulate blood pressure (correct)
  • Produce vitamin D
  • Produce red blood cells

Where are the adrenal glands located in relation to the kidneys?

  • Below the kidneys
  • On top of each kidney (correct)
  • Inside the kidney
  • Behind the kidneys

What are nephrons?

  • Structural units of the lungs
  • Structural and functional units of the kidneys (correct)
  • Structural units of the brain
  • Functional units of the liver

What stimulates the bone marrow to produce red blood cells?

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

Through which structure does blood enter the kidney?

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

Where does urine formation primarily occur?

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

Where does urine produced by the nephrons travel into?

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

What is the specific function of the distal convoluted tubule (DCT) in the kidney structure?

<p>Empties its contents into collecting ducts (A)</p> Signup and view all the answers

How many renal pyramids are found in an average kidney?

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

Where is the renal corpuscle located within the kidney structure?

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

What is the primary function of the loop of Henle in the nephron?

<p>Reabsorbing water and salts (C)</p> Signup and view all the answers

What is the function of the hilum in a kidney?

<p>Entry and exit point for blood vessels, nerves, and ureters (D)</p> Signup and view all the answers

What is the role of the afferent arteriole in the kidney structure?

<p>It enters the glomerulus (A)</p> Signup and view all the answers

Where does glomerular filtration primarily occur within the nephron?

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

What process occurs in the proximal convoluted tubule (PCT) of the kidney?

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

Where does water reabsorption primarily occur in the kidney?

<p>Loop of Henle (A)</p> Signup and view all the answers

What is the function of the efferent arteriole in the kidney structure?

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

Which process involves secreting additional solutes and wastes into the kidney tubules?

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

What is the function of the collecting duct in the urinary system?

<p>Reabsorbing water and returning it to the bloodstream (A)</p> Signup and view all the answers

Where does urine go after leaving the collecting ducts?

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

What triggers the release of urine from the bladder?

<p>Relaxation of a sphincter (D)</p> Signup and view all the answers

How does the length of the female urethra differ from that of males?

<p>Male urethra is shorter than female urethra (C)</p> Signup and view all the answers

Where is the renal pelvis located within the kidney?

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

Which part of the urinary system has conscious control over urination?

<p>Sphincter at the end of the urethra (D)</p> Signup and view all the answers

Which part of the loop of Henle is permeable to water?

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

What effect does aldosterone have on urine concentration?

<p>Increases urine concentration (B)</p> Signup and view all the answers

Where is antidiuretic hormone (ADH) formed in the body?

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

What is the primary role of ADH in the kidney?

<p>Promotes reabsorption of water (B)</p> Signup and view all the answers

Which hormone regulates sodium levels in the blood?

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

What is the overall impact of aldosterone on urine volume?

<p>Decrease urine volume (A)</p> Signup and view all the answers

What occurs in the collecting duct of the kidney?

<p>Reabsorption of water back into the bloodstream (D)</p> Signup and view all the answers

How does urine leave the bladder in the process of urination?

<p>By relaxation of a sphincter muscle (B)</p> Signup and view all the answers

In the urinary system, what is the role of the ureters?

<p>Movement of urine to the bladder (A)</p> Signup and view all the answers

What distinguishes the male urethra from the female urethra in terms of length?

<p>Male urethra is longer (B)</p> Signup and view all the answers

Which organ stores urine in the urinary system?

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

What controls the conscious process of urination in the urinary system?

<p>Sphincter muscle and brain coordination (C)</p> Signup and view all the answers

What is the main function of the adrenal glands located on top of each kidney?

<p>Regulate blood pressure (D)</p> Signup and view all the answers

Which hormone secreted by the kidneys stimulates the bone marrow to produce red blood cells?

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

Where does blood enter the kidney before splitting into afferent arterioles and supplying the nephrons?

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

In renal circulation, what occurs when blood passes through the capillaries of the glomerulus of a nephron?

<p>Filtration into Bowman's capsule (B)</p> Signup and view all the answers

Where do the filtered substances pass after leaving Bowman's capsule in the kidney structure?

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

What is the function of the afferent arterioles in renal circulation?

<p>Supply capillaries to nephrons (D)</p> Signup and view all the answers

In the urinary system, where does glomerular filtration primarily take place?

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

Which arteriole enters the glomerulus in the kidney structure?

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

Where do most solutes get reabsorbed in the kidney during the filtration process?

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

Which step in kidney physiology involves exchanging solutes and water in the loop of Henle?

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

What is the function of the peritubular capillary network in the kidney function?

<p>Surround and interact with renal tubules (A)</p> Signup and view all the answers

During tubular secretion in the kidneys, what process occurs with solutes and waste products?

<p>Secretion into kidney tubules (D)</p> Signup and view all the answers

What is the primary function of aldosterone in the urinary system?

<p>Affects urine concentration by regulating sodium levels (B)</p> Signup and view all the answers

Which statement best describes the permeability of the descending limb of the loop of Henle?

<p>Permeable to water, not solutes (A)</p> Signup and view all the answers

What does anti-diuretic hormone (ADH) primarily act on in the kidney?

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

How does aldosterone influence urine concentration in the body?

<p>By favoring the production of a concentrated urine (C)</p> Signup and view all the answers

What is the source of antidiuretic hormone (ADH) in the body?

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

How does ADH help the body conserve water?

<p>By promoting reabsorption of water in the collecting ducts (A)</p> Signup and view all the answers

Where does urine exit the kidney?

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

What is the function of the renal corpuscle in the kidney structure?

<p>Filtration of blood (B)</p> Signup and view all the answers

Which part of the nephron is responsible for reabsorption of water?

<p>Loop of Henle (A)</p> Signup and view all the answers

In which part of the kidney are the renal pyramids mainly located?

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

What is the primary function of the glomerulus in the renal corpuscle?

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

Which part of the kidney structure connects and empties its contents into collecting ducts?

<p>Distal convoluted tubule (DCT) (B)</p> Signup and view all the answers

The adrenal glands are part of the exocrine system and sit on top of each kidney.

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

Each kidney may have more than a million nephrons.

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

Erythropoietin secreted by the kidney stimulates bone marrow to produce white blood cells.

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

Blood enters the kidney through the renal vein.

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

The renal tubule of the nephron reabsorbs all the filtered substances and does not return any to the bloodstream.

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

Urine is primarily formed in the glomerulus of the nephron.

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

The bladder sends a nerve impulse to a sphincter to contract and hold urine.

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

All urine transport structures are identical in male and female including the length of the urethra.

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

The renal pelvis is located in the outer cortex of the kidney.

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

The urethra is a muscular tube that carries urine out of the body in both males and females.

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

The outer cortex, medulla, and renal pelvis are the three regions internally present in the kidney.

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

The female urethra is more resistant to urinary tract infections due to its shorter length compared to the male urethra.

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

The renal tubule is a short and straight structure that emerges from the glomerulus.

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

There are typically five renal pyramids in each kidney.

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

The loop of Henle is divided into two parts: the descending limb and the ascending limb.

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

The glomerulus is a network of capillaries located within the renal medulla.

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

Urine produced by the nephrons travels directly into the bladder without passing through the renal pelvis.

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

The renal corpuscle consists of a network of capillaries called Bowman's capsule.

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

Most solutes in the glomerular capillaries pass through by active transport.

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

The glomerular filtration rate (GFR) is an insignificant indicator of kidney function.

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

Almost all nutrients are secreted in the proximal convoluted tubule (PCT).

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

Reabsorption of water in the kidney primarily occurs in the descending limb of the loop of Henle.

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

Sodium (Na+) is mainly reabsorbed in the distal convoluted tubule (DCT).

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

Aldosterone has no impact on urine volume.

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

The descending limb of the loop of Henle is permeable to solutes, not water.

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

Aldosterone regulates sodium levels in the blood by promoting sodium reabsorption in the renal tubules.

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

ADH acts as a vasodilator and decreases blood pressure during hemorrhaging.

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

ADH helps the body conserve water by promoting water reabsorption in the collecting ducts.

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

Aldosterone favors the production of dilute urine.

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

The permeability of the ascending limb of the loop of Henle to solutes is higher than to water.

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

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