The interior lining of the bladder is composed of
The Correct Answer is {"dropdown-group-1":"D"}
A. Stratified cuboidal: This rare epithelial type is typically found in the larger ducts of sweat glands and provides structural reinforcement. It does not possess the specialized ability to stretch and flatten required for organ expansion. It lacks the umbrella cells characteristic of the urinary tract lining.
B. Pseudostratified columnar: This tissue type is characteristic of the respiratory tract and parts of the male reproductive system. It often contains cilia and goblet cells to facilitate the movement of mucus or debris. It does not provide the distensibility needed for a reservoir organ like the bladder.
C. Simple squamous: These thin, single-layered cells are optimized for rapid diffusion in the alveoli or endothelium of blood vessels. They provide minimal protection against the chemical toxicity of concentrated urine. They cannot accommodate the significant volume changes associated with the urinary bladder cycle.
D. Stratified transitional: Also known as urothelium, this tissue is uniquely designed to expand as the bladder fills with urine. The superficial umbrella cells transition from a rounded to a flattened morphology to prevent leakage under pressure. This provides an impermeable, flexible barrier against urinary waste products.
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Correct Answer is B
Explanation
A. It uses the Na+/K+ pump: This pump is an example of primary active transport, which requires ATP to move ions against their concentration gradients. Simple diffusion is a passive process that occurs spontaneously without the use of molecular pumps. It relies on kinetic energy rather than metabolic energy.
B. It moves molecules down their concentration gradient without energy: This is the fundamental definition of passive transport across a semi-permeable membrane. Molecules naturally migrate from areas of high concentration to areas of low concentration until equilibrium is reached. No cellular energy or ATP is consumed during this process.
C. It is the main mechanism for glucose absorption: Glucose is a large, polar molecule that cannot easily pass through the lipid bilayer via simple diffusion. It requires secondary active transport (SGLT) and facilitated diffusion (GLUT) to enter and exit renal cells. Its absorption is strictly carrier-mediated in the nephron.
D. It requires a specific receptor for each solute: Receptors and carrier proteins are characteristics of facilitated diffusion and active transport. Simple diffusion involves the movement of small, non-polar, or lipid-soluble substances directly through the phospholipid bilayer. It is characterized by a lack of specificity and saturation.
Correct Answer is C
Explanation
A. It causes water to move out of cells, shrinking them: This occurs in a hyper-osmolar environment, where the high concentration of extracellular solutes draws water out via osmosis. Hypo-osmolarity involves a lower solute concentration outside the cell. The osmotic pressure gradient would favor influx, not efflux.
B. It increases vascular resistance, raising blood pressure: Hypo-osmolarity is often associated with fluid overload, but it does not directly cause vasoconstriction. In many cases, it is linked to low sodium levels which can impair vascular tone. It primarily affects fluid distribution rather than active vessel resistance.
C. It causes water to move into cells, swelling and possible rupture: In a hypo-osmolar state, the intracellular fluid has a higher solute concentration than the surrounding plasma. Water moves down its osmotic gradient into the cells to achieve equilibrium. This cellular edema can lead to lysis and organ dysfunction.
D. It enhances sodium retention, preventing edema: Hypo-osmolarity typically triggers mechanisms to excrete water or retain sodium to restore balance. However, if the condition persists, the low osmotic pressure in the blood allows fluid to leak into the interstitial spaces. This results in the formation of edema.
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