Blood is normally slightly basic in nature.
pH range of blood is about 7.35 to 7.45.
Usually the body maintains the pH of blood is close to 7.40.

Hope, this is a satisfactory answer of your question.

**Nature and pH Value of Blood**

Blood is a vital fluid that circulates throughout the body, supplying oxygen and nutrients to the cells while also removing waste products. It is an essential component of the circulatory system and plays a crucial role in maintaining homeostasis. The nature and pH value of blood are important factors that contribute to its proper functioning.

**Nature of Blood:**

Blood is classified as a connective tissue due to its origin from the mesodermal layer in the embryo. It consists of two main components:

1. **Plasma:** Plasma makes up about 55% of the total blood volume. It is a yellowish fluid that constitutes water, ions, proteins, hormones, nutrients, waste products, and other substances. Plasma provides a medium for the transportation of various components within the blood.

2. **Formed Elements:** The remaining 45% of blood is composed of formed elements, which include red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). These cellular components are responsible for carrying out specific functions, such as oxygen transport, immune response, and blood clotting.

**pH Value of Blood:**

The pH value of a substance indicates its acidity or alkalinity. It is measured on a scale of 0 to 14, with 7 being considered neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity. The pH value of blood is tightly regulated to maintain a stable internal environment, typically ranging between 7.35 and 7.45. This slightly alkaline pH is crucial for the proper functioning of enzymes and other biochemical processes in the body.

**Regulation of Blood pH:**

The body has several mechanisms in place to regulate blood pH and prevent any significant deviations from the normal range. These mechanisms include:

1. **Buffer Systems:** Blood contains chemical buffers, such as bicarbonate, phosphate, and proteins, which can either absorb excess hydrogen ions (H+) or release them to maintain pH balance.

2. **Respiratory System:** The lungs play a crucial role in maintaining blood pH by regulating the levels of carbon dioxide (CO2) in the body. Increased CO2 levels lead to the formation of carbonic acid (H2CO3), which is then exhaled, helping to restore normal pH levels.

3. **Renal System:** The kidneys help regulate blood pH by selectively reabsorbing or excreting ions and acids during urine formation. They can remove excess hydrogen ions and reabsorb bicarbonate ions, thereby regulating blood pH.

**Conclusion:**

In summary, blood is a connective tissue consisting of plasma and formed elements. Its pH value is slightly alkaline, ranging from 7.35 to 7.45, and is tightly regulated to maintain optimal physiological conditions. Various mechanisms, including buffer systems, the respiratory system, and the renal system, work together to ensure the blood pH remains within the normal range. Understanding the nature and pH value of blood is essential for comprehending its functions and the importance of maintaining a balanced internal environment.