System Structure: Urinary - Massage and Bodywork Licensing Examination Mblex
- Which kidney cells secrete renin as part of blood pressure regulation?
- Juxtaglomerular (JG) cells. These specialized smooth muscle cells in the afferent arteriole release renin in response to low blood pressure or sodium levels.
- What is the name of the tip of a renal pyramid where urine drains into a calyx?
- Renal papilla. This apex projects into a minor calyx, allowing urine to enter the renal collecting system.
- Which tube carries urine from the bladder to the exterior of the body?
- Urethra. This duct expels urine during micturition, with length and function differing between sexes.
- Which renal structure is the outer region of the kidney that contains glomeruli?
- Renal cortex. This layer houses the renal corpuscles and convoluted tubules, facilitating the initial stages of urine production.
- Which sphincter is involuntary and composed of smooth muscle at the bladder neck?
- Internal urethral sphincter. This sphincter maintains continence by automatically closing the bladder outlet under autonomic control.
- What is the functional unit of the kidney that forms urine?
- Nephron. Each kidney contains over a million of these microscopic units that perform filtration, reabsorption, and secretion to produce urine.
- Which sphincter is voluntary and composed of skeletal muscle in the urogenital diaphragm?
- External urethral sphincter. This sphincter allows conscious control over urination through somatic nervous system innervation.
- Which nephron segment provides hormone-regulated ion and water adjustments before collection?
- Distal convoluted tubule (DCT). This tubule fine-tunes urine composition under hormonal influence, such as aldosterone and ADH, for electrolyte and fluid balance.
- What type of epithelium lines the urinary bladder and allows stretching?
- Transitional epithelium (urothelium). This specialized tissue accommodates bladder expansion and contraction without damage during filling and emptying.
- Identify the kidney structures that collect urine from papillae before it enters the pelvis.
- Minor and major calyces. These funnel-shaped extensions receive urine from the pyramids and converge to form the renal pelvis.
- What is the primary function of the urinary bladder?
- Temporary storage of urine prior to urination. This organ holds urine until voluntary release, preventing constant leakage and allowing controlled elimination.
- What are the cone-shaped structures in the renal medulla called?
- Renal pyramids. These structures direct urine from the collecting ducts toward the calyces for drainage.
- What is the name of the capillary tuft where filtration begins in a nephron?
- Glomerulus. This network of capillaries in the renal corpuscle allows fluid and solutes to pass into the nephron while retaining blood cells and proteins.
- Which nephron segment establishes the medullary osmotic gradient for concentration?
- Loop of Henle (nephron loop). This U-shaped structure creates a hyperosmotic environment in the medulla, enabling water reabsorption for urine concentration.
- What is the funnel-like structure that collects urine and becomes the ureter?
- Renal pelvis. This basin funnels urine from the calyces into the ureter for transport out of the kidney.
- What is the primary function of the urinary system in maintaining homeostasis?
- Filter blood and excrete wastes while regulating fluid, electrolytes, and pH. This system maintains homeostasis by removing metabolic wastes and balancing essential body components through urine formation.
- Identify the nephron tubule segment that is the primary site of reabsorption.
- Proximal convoluted tubule (PCT). This segment reabsorbs the majority of water, ions, and nutrients from the glomerular filtrate back into the blood.
- Which vessel carries filtered blood away from the kidney to the inferior vena cava?
- Renal vein. This vessel drains deoxygenated, filtered blood from the kidneys back to systemic circulation.
- What is the structure that receives fluid from multiple nephrons and drains toward papillae?
- Collecting duct. This tubule consolidates urine from several nephrons and responds to ADH for final water reabsorption before excretion.
- Which vessel carries blood into the kidney from the abdominal aorta?
- Renal artery. This vessel supplies oxygenated blood to the kidneys for filtration at high pressure.
- Which renal structure is the inner region of the kidney that contains pyramids?
- Renal medulla. This region contains loops of Henle and collecting ducts, enabling urine concentration through osmotic gradients.
- Which tube transports urine from each kidney to the urinary bladder?
- Ureter. This muscular tube propels urine via peristalsis from the renal pelvis to the bladder for storage.
- What is the correct urine flow order starting at the kidney: pelvis, ureter, bladder, urethra?
- Renal pelvis → ureter → urinary bladder → urethra. Urine follows this pathway from collection in the kidney to storage and eventual expulsion from the body.
- Identify the organ that is the main site of blood filtration in the urinary system.
- Kidneys. These paired organs filter blood plasma to form urine, removing wastes while conserving necessary substances.
- What is the name of the cup-like structure that surrounds the glomerulus?
- Bowman capsule (glomerular capsule). This structure forms the renal corpuscle with the glomerulus and collects the initial filtrate during urine formation.