Which describes the function of diffusion?
It is the process by which a substance requires energy to pass through a membrane against a concentration gradient
It is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution into a more concentrated one
It is the process by which molecules move from high-concentration areas to low-concentration areas.
It is the process by which certain molecules pass through the plasma membrane with the help of carrier proteins.
The Correct Answer is C
A. It is the process by which a substance requires energy to pass through a membrane against a concentration gradient:
This describes active transport, not diffusion. Active transport requires ATP to move substances against their gradient.
B. It is the process by which solvent molecules pass through a semipermeable membrane from a less concentrated solution into a more concentrated one:
This describes osmosis, not diffusion. Osmosis specifically refers to the movement of water.
C. It is the process by which molecules move from high-concentration areas to low-concentration areas:
This correctly defines diffusion - the passive movement of molecules down their concentration gradient.
D. It is the process by which certain molecules pass through the plasma membrane with the help of carrier proteins:
This describes facilitated diffusion, which still moves substances down their gradient but requires a protein carrier.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Improper perineal hygiene:
Poor perineal hygiene can allow bacteria (like E. coli) from the anus to migrate into the urethra, leading to UTI.
B. High level of physical activity:
Exercise is not a direct risk factor for UTI development.
C. High-sodium diet:
Sodium intake affects blood pressure and fluid balance, but not UTI risk directly.
D. Radiotherapy to the pelvis:
While radiation can damage pelvic tissues and later increase UTI risk, it’s less common and not the primary classic risk factor compared to hygiene issues.
Correct Answer is C
Explanation
A. Bladder cancer:
Bladder cancer is treated through surgery, chemotherapy, or radiation, but not by "chemical castration."
B. Testicular cancer:
While testicular cancer may involve treatments that affect hormones, chemical castration is typically not a treatment for testicular cancer.
C. Prostatic cancer:
Prostatic cancer (prostate cancer) is often treated with chemical castration (using medications such as LHRH agonists or anti-androgens) to reduce testosterone levels and slow tumor growth.
D. Urethral cancer:
Urethral cancer is rare and treated with surgery or chemotherapy, not chemical castration.
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