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</p> Signup and view all the answers

    Through which structure does blood enter the kidney?

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

    Where does urine formation primarily occur?

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

    Where does urine produced by the nephrons travel into?

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

    How many renal pyramids are found in an average kidney?

    <p>Eight</p> Signup and view all the answers

    Where is the renal corpuscle located within the kidney structure?

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

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

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

    Where does glomerular filtration primarily occur within the nephron?

    <p>Glomerulus</p> Signup and view all the answers

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

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

    Where does water reabsorption primarily occur in the kidney?

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

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

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

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

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

    Where does urine go after leaving the collecting ducts?

    <p>Bladder</p> Signup and view all the answers

    What triggers the release of urine from the bladder?

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

    Where is the renal pelvis located within the kidney?

    <p>Hilum</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</p> Signup and view all the answers

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

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

    What effect does aldosterone have on urine concentration?

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

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

    <p>Hypothalamus</p> Signup and view all the answers

    What is the primary role of ADH in the kidney?

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

    Which hormone regulates sodium levels in the blood?

    <p>Aldosterone</p> Signup and view all the answers

    What is the overall impact of aldosterone on urine volume?

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

    What occurs in the collecting duct of the kidney?

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

    Which organ stores urine in the urinary system?

    <p>Bladder</p> Signup and view all the answers

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

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

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

    <p>Erythropoietin</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</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</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</p> Signup and view all the answers

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

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

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

    <p>Glomerulus</p> Signup and view all the answers

    Which arteriole enters the glomerulus in the kidney structure?

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

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

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

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

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

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

    <p>Hypothalamus</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</p> Signup and view all the answers

    Where does urine exit the kidney?

    <p>Hilum</p> Signup and view all the answers

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

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

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

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

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

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

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

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

    Each kidney may have more than a million nephrons.

    <p>True</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

    Blood enters the kidney through the renal vein.

    <p>False</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</p> Signup and view all the answers

    Urine is primarily formed in the glomerulus of the nephron.

    <p>False</p> Signup and view all the answers

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

    <p>False</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</p> Signup and view all the answers

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

    <p>False</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</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</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</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

    There are typically five renal pyramids in each kidney.

    <p>False</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</p> Signup and view all the answers

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

    <p>False</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</p> Signup and view all the answers

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

    <p>True</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

    <p>False</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</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

    Aldosterone has no impact on urine volume.

    <p>False</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

    <p>True</p> Signup and view all the answers

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

    <p>False</p> Signup and view all the answers

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

    <p>True</p> Signup and view all the answers

    Aldosterone favors the production of dilute urine.

    <p>False</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</p> Signup and view all the answers

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