**Core Concept**
Carbon dioxide transport in the blood is crucial for maintaining acid-base balance and proper oxygenation of tissues. There are three main forms of carbon dioxide transport: dissolved CO2, bicarbonate ions (HCO3-), and carbaminohemoglobin.

**Why the Correct Answer is Right**
The correct answer is bound to the hemoglobin molecule as carbaminohemoglobin. This form of carbon dioxide transport is the most important because it allows for efficient buffering of CO2 in the blood, especially in the lungs where CO2 is exhaled. Carbaminohemoglobin is formed when CO2 binds to the N-terminal amino group of the hemoglobin molecule, facilitating its transport to the lungs for exhalation. This process is facilitated by the high affinity of hemoglobin for CO2.

**Why Each Wrong Option is Incorrect**
**Option A:** Dissolved CO2 is indeed a form of carbon dioxide transport, but it is not the most important form, as it only accounts for a small percentage of total CO2 transport.
**Option B:** Bicarbonate ions (HCO3-) are also an important form of carbon dioxide transport, but they are not the primary form, as they are formed through the reaction of CO2 with water in the presence of the enzyme carbonic anhydrase.
**Option C:** Carbamino compounds are indeed formed when CO2 binds to proteins, but they are not the most important form of carbon dioxide transport in the blood.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the buffering capacity of the bicarbonate system can be impaired in conditions such as respiratory acidosis, where the concentration of CO2 increases, and metabolic alkalosis, where the concentration of bicarbonate ions increases.

**Correct Answer: C. Carbaminohemoglobin**