What is the major component of blood plasma?
A.
Water.
B.
Ions.
C.
Nutrients.
D.
Gases.
The Correct Answer and Explanation is:
The correct answer is A. Water.
Blood plasma is the liquid component of blood, and it makes up about 55% of the blood’s volume. The primary component of plasma is water, which constitutes approximately 90-92% of its total volume. The high water content is essential for plasma’s role in maintaining blood volume, distributing nutrients, hormones, and waste products, and regulating body temperature.
Explanation:
- Water as the Major Component: Water serves as the main solvent in plasma, facilitating the suspension of other components such as proteins, ions, and gases. It plays a vital role in transporting nutrients, hormones, waste products, and gases throughout the body. The fluidity of plasma allows blood to flow through the blood vessels efficiently, ensuring the delivery of essential substances to tissues and organs.
- Plasma Proteins and Other Components: Though water is the major component, plasma also contains various proteins such as albumin, globulins, and fibrinogen. These proteins have critical roles in maintaining oncotic pressure, immune functions, and blood clotting. However, these proteins and other components are dissolved or suspended in the water, which makes water the fundamental element that supports these functions.
- Ions, Nutrients, and Gases: Plasma contains ions such as sodium (Na+), potassium (K+), calcium (Ca2+), and bicarbonate (HCO₃⁻), but these account for a much smaller percentage of the plasma composition compared to water. These ions are critical for cellular function, nerve transmission, and maintaining the body’s pH balance, but their presence in plasma is relatively minimal in terms of volume.Nutrients like glucose, amino acids, and lipids, and gases such as oxygen (O₂) and carbon dioxide (CO₂), are also present in plasma but in trace amounts. Water acts as the medium for the transport of these substances.
In summary, the primary component of plasma is water, which supports the transportation and dissolution of other essential molecules and substances throughout the circulatory system.