A client with chronic bronchitis reports increased coughing in the morning. What is the most likely cause?

Rationale:

A. Keloids are raised, thickened scars that extend beyond the boundaries of the original wound. They result from excessive collagen deposition during the healing process and can cause cosmetic concerns, itching, and discomfort.

B. Adhesions are bands of fibrous scar tissue that can form between internal organs or tissues following surgery, injury, or severe burns. They can restrict organ movement, cause pain, or lead to complications such as bowel obstruction, depending on their location.

C. Contractures occur when scar tissue tightens during healing, limiting joint mobility. This is a common complication of deep partial-thickness or full-thickness burns and can lead to functional impairment if not managed with physical therapy, splinting, or surgical intervention.

D. Excessive scar formation does not cause increased hair growth. In fact, scar tissue often lacks hair follicles, sweat glands, and sebaceous glands, resulting in areas that may be hairless and less functional.

E. Scar tissue is generally less elastic than normal skin due to dense collagen deposition and abnormal alignment of fibers. Excessive scarring can lead to stiffness and limited flexibility rather than enhanced elasticity.

Rationale:

A. The Loop of Henle primarily functions to concentrate urine and maintain the osmotic gradient in the renal medulla. It allows for selective reabsorption of water and salts but does not directly filter blood. Its role is in modifying the filtrate that has already been produced by the glomerulus rather than initiating filtration.

B. The proximal convoluted tubule is responsible for reabsorbing the majority of filtered water, glucose, amino acids, and electrolytes from the glomerular filtrate back into the bloodstream. While it plays a crucial role in regulating the composition of the filtrate, it does not perform the initial filtration of blood.

C. The glomerulus is a tuft of specialized capillaries located within Bowman's capsule in the nephron, and it serves as the primary filtration unit of the kidney. Blood enters the glomerulus under high hydrostatic pressure, which forces water, electrolytes, glucose, and small molecules through the glomerular filtration membrane into Bowman's capsule, forming the initial filtrate. The filtration membrane is selective, retaining larger molecules like proteins and blood cells within the circulatory system. This process establishes the foundation for urine formation and allows the kidneys to regulate fluid and electrolyte balance effectively.

D. The collecting duct primarily functions in the final concentration or dilution of urine, responding to hormones such as antidiuretic hormone (ADH) and aldosterone. It fine-tunes water and electrolyte reabsorption but does not participate in the initial filtration of blood.