Final answer:
The kidneys(b) are primarily responsible for the regulation of blood acidity and pressure, although the liver, pancreas, and gallbladder also contribute to overall bodily functions.
Step-by-step explanation:
Regulation of acidity and blood pressure is largely attributed to the kidneys(b). The kidneys are crucial in maintaining homeostasis by regulating blood pH and pressure. They work with the adrenal cortex, lungs, and liver in the renin-angiotensin-aldosterone system to regulate blood pressure. Additionally, the kidneys assist in regulating osmolarity by controlling solutes and water and share the regulation of blood pH with the lungs and plasma buffers. This ensures that proteins can maintain their structure and function. The liver, pancreas, and gallbladder do contribute to digestion and the balance of bodily functions, but when it comes to regulating acidity and blood pressure, the kidneys play the most significant role.