Which complications may occur as a result of poor perfusion? Select all that apply.

A. Antidiuretic hormone:Antidiuretic hormone (ADH) promotes water reabsorption in the kidneys by increasing the permeability of the distal tubules and collecting ducts. It conserves water and increases blood volume, rather than promoting excretion of sodium and water.

B. Atrial natriuretic peptide:Atrial natriuretic peptide (ANP) is released by the atria in response to increased blood volume and pressure. It promotes sodium and water excretion by the kidneys, leading to decreased blood volume and reduced blood pressure, thereby helping maintain fluid balance.

C. Aldosterone:Aldosterone, a mineralocorticoid from the adrenal cortex, promotes sodium reabsorption and potassium excretion in the kidneys. This action conserves sodium and water, increasing blood volume, rather than promoting their excretion.

D. Adrenalin:Adrenaline (epinephrine) is a catecholamine that primarily affects the cardiovascular system by increasing heart rate, contractility, and vasoconstriction. It does not directly regulate sodium or water excretion and does not play a primary role in fluid balance.

A. Inguinal hernias:Inguinal hernias can cause a mechanical bowel obstruction by physically trapping a segment of the intestine. This is a structural cause, not a functional obstruction, because the bowel is blocked by an anatomical barrier.

B. Surgical scar tissue:Adhesions from prior surgery are a common cause of mechanical bowel obstruction. Scar tissue creates physical constriction or kinking of the intestines, preventing the passage of contents.

C. Tumor of the intestine:An intestinal tumor can physically block the lumen, leading to mechanical obstruction. Tumors create a tangible barrier rather than impairing bowel motility, so this is not a functional obstruction.

D. Spinal cord injury:Functional, or paralytic, bowel obstruction occurs when the nerves controlling intestinal motility are impaired. Spinal cord injury can disrupt autonomic and enteric nervous system signaling, causing the intestines to stop propelling contents despite no physical blockage, leading to a functional obstruction.