Which physiological process supports the exchange of blood concentrations across a semipermeable membrane in the hemodialysis?

Solute movement toward a solution with a higher concentration.

Water movement toward a solution with a lower solute concentration.

Blood cells and protein movement through the semipermeable membrane.

Osmosis of water movement and diffusion of solute movement.

Answer and Explanation

The Correct Answer is D

Hemodialysis is a renal replacement therapy used to remove waste products and excess fluid from the blood when the kidneys are unable to perform this function adequately. The physiological processes involved in hemodialysis include:

A) Solute movement toward a solution with a higher concentration:

While solute movement occurs during hemodialysis, it is typically from a solution with a higher concentration to one with a lower concentration, rather than the opposite. This movement facilitates the removal of waste products and excess solutes from the bloodstream.

B) Water movement toward a solution with a lower solute concentration:

Correct. Osmosis is the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. In hemodialysis, water moves out of the bloodstream, across the semipermeable membrane of the dialyzer, and into the dialysate solution, which has a lower solute concentration. This process helps remove excess fluid from the body.

C) Blood cells and protein movement through the semipermeable membrane:

Blood cells and proteins are too large to pass through the pores of the semipermeable membrane in the dialyzer during hemodialysis. Therefore, the primary exchange occurs between smaller molecules such as urea, creatinine, electrolytes, and water.

D) Osmosis of water movement and diffusion of solute movement:

Correct. Hemodialysis involves both osmosis and diffusion. Osmosis refers to the movement of water across a semipermeable membrane from an area of lower solute concentration to an area of higher solute concentration. Diffusion is the movement of solutes from an area of higher concentration to an area of lower concentration. Together, these processes facilitate the removal of waste products and excess fluid from the bloodstream during hemodialysis.

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Correct Answer is A

Explanation

A) Blockage of retinal capillaries causing ischemic damage of the central macular area:

Correct. Blurry central vision that worsens over time can be indicative of macular ischemia, often caused by blockage of retinal capillaries leading to ischemic damage of the central macular area. This condition can occur in diseases such as diabetic retinopathy or retinal vein occlusion.

B) Opaque spoke-like lines developing in the periphery of the lens to the center:

This description is more characteristic of cataracts, which cause visual disturbances such as glare or halos around lights rather than blurry central vision.

C) Tears in the retina that detach from the lining of the posterior eyeball:

Retinal tears and subsequent detachment can cause visual disturbances, but they typically present as sudden onset of floaters, flashes of light, and a curtain-like shadow over the visual field rather than blurry central vision.

D) An increase in intraocular pressure with loss of peripheral vision:

This description is indicative of glaucoma, which can lead to loss of peripheral vision (visual field defects) rather than blurry central vision. Glaucoma-related visual field loss usually begins peripherally and progresses inward, affecting central vision in later stages.

A. Flank pain and profound hypotension. B. Acute shortness of breath and chest pain. C. Absent pedal pulses and darkened toes. D. Tea-colored urine and decreased output.

Correct Answer is A

Explanation

A) Flank pain and profound hypotension:

Correct. Flank pain, often described as a deep, constant, gnawing, or throbbing sensation in the abdomen or back, can be a sign of impending rupture or dissection of an abdominal aortic aneurysm (AAA). Profound hypotension may occur if the AAA ruptures, leading to massive internal bleeding and shock. Prompt recognition of these signs is crucial for early intervention and surgical repair to prevent catastrophic consequences.

B) Acute shortness of breath and chest pain:

Acute shortness of breath and chest pain are more indicative of cardiovascular or pulmonary conditions such as myocardial infarction, pulmonary embolism, or acute coronary syndrome rather than an abdominal aortic aneurysm. While aortic dissection can present with chest pain, it is typically described as severe, tearing, or ripping pain that radiates to the back, not as acute shortness of breath.

C) Absent pedal pulses and darkened toes:

Absent pedal pulses and darkened toes may indicate peripheral vascular disease or critical limb ischemia but are not specific signs of an abdominal aortic aneurysm. While AAA can lead to peripheral ischemia in advanced cases, it is not typically associated with acute changes in pedal pulses or toe discoloration.

D) Tea-colored urine and decreased output:

Tea-colored urine and decreased urine output may indicate acute kidney injury or rhabdomyolysis but are not specific signs of an abdominal aortic aneurysm. While a ruptured AAA can lead to renal ischemia and acute kidney injury due to hypoperfusion, these symptoms are not the primary manifestations of AAA

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Which physiological process supports the exchange of blood concentrations across a semipermeable membrane in the hemodialysis?

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