Urinary, Endocrine, and Reproductive Systems Practice Flashcards

Urinary System Anatomy and Function

  • Primary Reabsorption Site: Most reabsorption takes place in the proximal convoluted tubule (Option B). This specific area is lined with microvilli to maximize the surface area for soaking nutrients back into the blood.
  • Urinary Tract Infections (UTIs) in Females: Females tend to have more urinary tract infections compared to males (Option D). This is due to the shorter length of their urethra, which allows bacteria to reach the bladder more easily.
  • Pathway of Urine: When urine leaves the renal pelvis, it next enters the ureter (Option D).
  • Structural Components: The glomerular capsule (Option B) contains podocytes. The renal pyramids are located in the renal medulla (Option C) of the kidney.
  • Vasculature and Microstructure: The vasa recta (Option D) are the capillaries surrounding the nephron loop. The purpose of microvilli in the renal tubule is to increase surface area for reabsorption (Option B).
  • Renal Positioning: The right kidney is lower than the left kidney because it experiences crowding from the liver (Option D).
  • Urinary System Order: The correct anatomical order of urinary structures is the ureter, followed by the bladder, and finally the urethra (Option C).
  • Retroperitoneal Location: The kidneys are described as retroperitoneal, meaning they are located behind the peritoneum (Option C).
  • Collecting and Processing: The renal pelvis (Option D) is the large collecting area before the urine exits the kidney. In a juxtamedullary nephron, the nephron loop (Option D) is the structure partially located in the renal medulla.
  • Nephron Density: Each kidney contains around 1,000,0001,000,000 nephrons.
  • System Complexity: There is not one collecting duct for each nephron; instead, multiple nephrons drain into a single collecting duct.

Renal Physiology and Fluid Regulation

  • Antidiuretic Hormone (ADH) Dynamics: Hyposecretion of ADH increases urine volume (Option C). Without ADH, the kidneys cannot reabsorb water, leading to a condition known as Diabetes Insipidus. Conversely, ADH increases water reabsorption (Option D).
  • Sphincter Control: The internal urethral sphincter is involuntarily controlled, while the external one is under voluntary control (Answer: False).
  • Ion Concentration and Reabsorption: Sodium (Option D) is the most abundant ion in the filtrate. The active pumping of sodium (Option D) helps with the reabsorption of other substances such as water and glucose.
  • Glomerular Dynamics: High blood pressure in the glomerulus is due to the small diameter of the efferent arteriole (Option C). The glomerulus (Option B) is the structure where blood pressure is highest in the system. The first stage of urine formation is glomerular filtration (Option A).
  • pH Balance: A normal pH for blood is 7.47.4, and a normal pH for urine is 66 (Option C).
  • Reabsorption Mechanisms: Aldosterone increases water reabsorption, and ADH also increases water reabsorption (Option D). The countercurrent mechanism involves the nephron loop and the vasa recta (Option D).
  • Blood Pressure Regulation: Angiotensin causes blood vessels to constrict, which raises the blood pressure (Option B).
  • Glomerular Filtration Rate (GFR): Measuring glucose in the urine is not the easiest way to determine GFR; it is usually measured using creatinine or specialized markers (Answer: False).

Endocrine System: Glands and Secretion

  • Gland Locations: The thyroid gland is superior to the thymus gland (Answer: True). The thymus gland is notable for decreasing in size after puberty (Option C).
  • Hormonal Production and Secretion: Endocrine glands are glands of internal secretion that release hormones via the bloodstream (Option B). Tropic hormones (Option A, e.g., follicle stimulating hormone) are those that direct other glands to release hormones.
  • Hypothalamus and Pituitary Relationship: The infundibulum connects the hypothalamus and the pituitary gland (Option C). Hypothalamic releasing hormones direct the release of hormones from the pituitary gland.
  • Pituitary Specifics: The posterior lobe of the pituitary gland produces 00 hormones (Option A); it only stores hormones made by the hypothalamus. Antidiuretic hormone (ADH) is not made by the anterior pituitary (Option A).
  • Thyroid and Adrenal Glands: Hormones containing iodine are secreted from the thyroid (Option D). Hyperthyroidism is commonly caused by Graves' disease, while hypothyroidism is usually caused by thyroiditis (Option C). In the adrenal glands, the cortex is the outer layer and the medulla is the inner core; the medulla does not surround the cortex.
  • Pancreastic Function: The islets of Langerhans (Option B) are located in the pancreas and contain both alpha and beta cells. Glucagon raises blood sugar levels (Option C), while insulin lowers blood sugar.
  • Hormone Classifications: An example of a steroid hormone is a glucocorticoid (Option B). Steroid hormones are lipid-soluble and enter the cell directly, whereas non-steroid (protein) hormones usually require a second messenger like cAMPcAMP.
  • Endocrine Pathophysiology: Hypersecretion of growth hormone results in acromegaly (Option B). Type I diabetes mellitus (Option C) is classified as an autoimmune disease where the immune system attacks insulin-producing beta cells. A goiter (Answer: False) is caused by a lack of iodine, not calcium.
  • Control Mechanisms: Hormones controlled by substance levels in the body are under humoral control (Option C). Epinephrine (Option A) is a hormone under neural control.

Reproductive System and Human Development

  • Male Reproductive Anatomy: The urethra (Option D) is the male structure that serves both the reproductive and urinary systems. It is surrounded by the prostate gland. Sperm mature and are stored in the epididymis (Option B). After a vasectomy, a man still ejaculates seminal fluid, just without sperm (Answer: False).
  • Ejaculate Composition: The majority of semen comes from the seminal glands (Option C).
  • Female Reproductive Anatomy: The clitoris is female erectile tissue (Answer: True). The endometrium functional layer (Option B) is the uterine layer that sloughs off monthly during menstruation.
  • Cycle and Ovulation: The follicular phase (Option A) ends at ovulation. A mature (Graafian) follicle releases an egg at ovulation, not a primary follicle. The hormonal trigger for ovulation is an increased level of LH, known as the LH Surge (Option D).
  • Reproductive Processes: Fertilization occurs in the uterine tube (Option D), which is open at the ovarian end with fimbriae to catch the egg. Implantation takes place in the uterus.
  • Genetics and Development: A mature sperm cell is haploid, containing 2323 total chromosomes, including 11 sex chromosome (Option A). Each sperm cell does not contain 2323 pairs. The umbilical cord connects the fetus to the placenta (Answer: True). The corpus luteum (Answer: True) is active throughout pregnancy, producing progesterone to maintain the uterine lining until the placenta takes over.
  • Puberty and Hormones: GnRH (Option B) is the initial stimulus for puberty. Follicle stimulating hormone (FSH) and luteinizing hormone (LH) are not high at birth but spike at puberty (Answer: False).
  • Lactation: Prolactin allows the mother to produce milk, while oxytocin is active in the secretion (let-down) of milk (Option D). Oxytocin is also responsible for uterine contractions.
  • Diagnostics: A PSA blood test could help detect prostate cancer (Option C).

Thermoregulation and Homeostasis

  • Heat Response: When the body is too warm, blood vessels dilate (Answer: True) to allow heat to escape through the skin. On a hot day, the hypothalamus directs the body to sweat and dilate blood vessels (Option D).
  • Diagnostic Symptoms: Frequent urination and excessive thirst are possible symptoms of diabetes mellitus (Option C).

Questions & Discussion

  • Question on Sphincter Control: Is the internal urethral sphincter voluntarily controlled?
  • Response: False. The internal sphincter is involuntary; only the external one is under your control.
  • Question on Diabetes Insipidus and Glucose: If you have diabetes insipidus, you may have glucose in your urine?
  • Response: False. Glucose in urine is a sign of Diabetes Mellitus, not Diabetes Insipidus.
  • Question on Vasectomy and Semen: After a vasectomy, does a man ejaculate any semen?
  • Response: False. He still ejaculates seminal fluid, just without sperm.