Plasma, Red Bloodcells(RBC) ,White blood Cells(WBC), Platelets are components of blood.

Components of Blood
Blood is a vital fluid in the human body composed of various components, each serving essential functions. The main components include:

1. Plasma
- Plasma constitutes about 55% of total blood volume.
- It is a yellowish liquid that carries cells, nutrients, hormones, and waste products.
- Composed of approximately 90% water, plasma also contains proteins such as albumin, globulins, and fibrinogen that assist in blood clotting and immune response.

2. Red Blood Cells (Erythrocytes)
- Red blood cells make up about 40-45% of blood volume.
- They are responsible for transporting oxygen from the lungs to the body and returning carbon dioxide from the tissues to the lungs.
- Contain hemoglobin, a protein that binds oxygen and gives blood its red color.

3. White Blood Cells (Leukocytes)
- Comprise less than 1% of blood volume but play a crucial role in the immune system.
- Types include neutrophils, lymphocytes, monocytes, eosinophils, and basophils, each with specific functions in defending against infections and foreign substances.
- They can move out of blood vessels to reach tissues where they are needed.

4. Platelets (Thrombocytes)
- Platelets are small cell fragments involved in blood clotting.
- They help prevent excessive bleeding by aggregating at sites of injury and releasing chemicals that promote clot formation.
- Essential for wound healing and maintaining vascular integrity.
Understanding the components of blood is fundamental to grasping its role in maintaining homeostasis and supporting overall health.