Urologic Anatomy & Physiology Flashcards

What is the primary function of the kidneys?

Answer: To filter blood and form urine

The kidneys are vital organs with the primary function of filtering blood to remove waste products, excess salts, and water. This filtration process results in the formation of urine, which is then excreted from the body. Beyond waste removal, kidneys also play crucial roles in regulating blood pressure, electrolyte balance, and red blood cell production.

Which structure connects the kidney to the bladder?

Answer: Ureter

The ureters are muscular tubes that serve as the conduits for urine, connecting each kidney to the bladder. They transport urine from the renal pelvis of the kidneys down to the bladder through peristaltic contractions. This continuous flow ensures that urine produced by the kidneys is efficiently moved for storage.

What is the role of the bladder?

Answer: Stores urine

The bladder is a muscular, expandable sac located in the pelvis, primarily responsible for storing urine. It collects urine produced by the kidneys and holds it until it is convenient for the individual to urinate. This storage capacity allows for intermittent urination and prevents continuous leakage.

Which part of the nephron is responsible for filtration?

Answer: Glomerulus

The glomerulus is a key component of the nephron, the functional unit of the kidney, and is solely responsible for the initial filtration of blood. It is a network of tiny capillaries that filters water, salts, glucose, amino acids, and waste products from the blood, forming a filtrate that then enters the renal tubule for further processing.

What hormone regulates water reabsorption in the kidneys?

Answer: Antidiuretic hormone (ADH)

Antidiuretic hormone (ADH), also known as vasopressin, is a crucial hormone that regulates water reabsorption in the kidneys. It acts on the collecting ducts to increase their permeability to water, allowing more water to be reabsorbed back into the bloodstream. This mechanism helps the body conserve water and concentrate urine, especially during dehydration.

Which structure controls the release of urine from the bladder?

Answer: Urethral sphincter

The urethral sphincter is a muscular structure that controls the release of urine from the bladder. It consists of an internal involuntary sphincter and an external voluntary sphincter. Together, these sphincters regulate the flow of urine, allowing for conscious control over urination and preventing leakage.

What is the function of the detrusor muscle?

Answer: Contracts to expel urine

The detrusor muscle is the smooth muscle that forms the wall of the bladder. Its primary function is to contract during urination, increasing pressure within the bladder to expel urine through the urethra. This contraction is largely involuntary, controlled by the parasympathetic nervous system.

Which part of the nephron reabsorbs most nutrients and water?

Answer: Proximal convoluted tubule

The proximal convoluted tubule (PCT) is the segment of the nephron immediately following the glomerulus, and it is highly specialized for reabsorption. It reabsorbs the majority of filtered water, sodium, and nearly all filtered nutrients like glucose and amino acids back into the bloodstream. This extensive reabsorption is crucial for maintaining the body's fluid and electrolyte balance.

What is the function of the renal pelvis?

Answer: Collects urine

The renal pelvis is a funnel-shaped structure located within the kidney, serving as the central collecting point for urine. Its primary function is to gather urine from the collecting ducts of the nephrons and then funnel it into the ureter. From there, the urine is transported to the bladder for storage.