What is blood circulation?

Blood circulation is the continuous movement of blood throughout the body, facilitated by the heart and blood vessels. The heart pumps oxygen-rich blood to all parts of the body through arteries, and then collects oxygen-depleted blood through veins to be sent back to the heart and lungs for reoxygenation. This process is essential for delivering nutrients and oxygen to cells, removing waste products, and maintaining overall health and function of the body.

Blood circulation is the closed system of blood vessels that transport blood throughout the body. It consists of two circuits:

1. Systemic Circulation:

- Blood is pumped by the left ventricle of the heart through the aorta and arteries.
- Blood flows through the capillaries in the organs and tissues, delivering oxygen and nutrients.
- Blood collects in veins and returns to the right atrium of the heart.

2. Pulmonary Circulation:

- Deoxygenated blood returns to the right atrium from the systemic circulation.
- The right ventricle pumps blood to the pulmonary arteries, which carry it to the lungs.
- In the lungs, blood exchanges carbon dioxide for oxygen.
- Oxygenated blood returns to the left atrium of the heart via the pulmonary veins.

Key Components:

- Heart: The pump that powers the circulatory system.
- Blood vessels: Arteries carry blood away from the heart, veins carry blood back to the heart, and capillaries allow for exchange of substances.
- Blood: The fluid that transports oxygen, nutrients, hormones, and waste products.

Functions of Blood Circulation:

- Delivering oxygen and nutrients to cells
- Removing waste products
- Transporting hormones and other signaling molecules
- Regulating body temperature
- Maintaining fluid balance
- Providing immune defense