What are the three components in circulatory system?

The circulatory system, also known as the cardiovascular system, consists of three main components:

1. Heart:

- The heart is a muscular organ that acts as the pump of the circulatory system.

- It consists of four chambers: two atria (left and right) and two ventricles (left and right).

- The atria receive blood from the body and lungs, while the ventricles pump blood out to the body and lungs.

- The heart's pumping action is coordinated by electrical signals generated by specialized cells called the sinoatrial node (SA node) and atrioventricular node (AV node).

2. Blood Vessels:

- Blood vessels are channels or pathways through which blood flows throughout the body.

- There are three types of blood vessels: arteries, capillaries, and veins.

- Arteries carry oxygenated blood away from the heart to tissues and organs.

- Capillaries are tiny, thin-walled vessels where the exchange of substances occurs between blood and body tissues.

- Veins carry deoxygenated blood back to the heart from tissues and organs.

3. Blood:

- Blood is a tissue that circulates throughout the body, transporting essential substances and removing waste products.

- It consists of plasma, red blood cells (erythrocytes), white blood cells (leukocytes), platelets (thrombocytes), and various dissolved substances.

- Plasma is the liquid component of blood that makes up about 55% of its volume and contains water, proteins, electrolytes, hormones, and waste products.

- Red blood cells carry oxygen, white blood cells fight infections, platelets help in blood clotting, and plasma transports various substances.