The tubular structure of the uterus that projects a short distance into the vagina is called the_

A. Tubular secretion involves the reabsorption of substances from the renal tubules into the peritubular capillaries.: That describes reabsorption, the opposite of secretion.
B. Tubular secretion is a passive process that occurs in the glomerulus, allowing the filtration of waste products.: Filtration in the glomerulus is a separate, largely passive process; tubular secretion is an active transport process occurring in the renal tubules.
C. Tubular secretion is the movement of substances from the blood in the peritubular capillaries into the renal tubules.: This correctly describes tubular secretion (e.g., H⁺, K⁺, drugs) .
D. Tubular secretion primarily occurs in the Bowman's capsule, facilitating the selective reabsorption of essential nutrients.: Bowman's capsule is the site of filtration, not tubular secretion; selective reabsorption occurs later in the tubules.

A. Converted to carbon monoxide: CO (carbon monoxide) is a different gas and is not a product or transport form of CO₂.
B. Bind to myoglobin: Myoglobin primarily binds O₂ within muscle cells; CO₂ transport by myoglobin is not a main mechanism.
C. Binds to hemoglobin: CO₂ can bind to hemoglobin (forming carbaminohemoglobin) as one transport form.
D. Converted to bicarbonate ions: Most CO₂ is converted to bicarbonate (HCO₃⁻) in red blood cells and transported in plasma.
E. Dissolved in plasma: A small proportion of CO₂ is carried dissolved directly in plasma.