Question

Where are the blood cells formed?

Answer 1

Blood has been dubbed the "river of life" because it transports numerous compounds to various parts of the body. The red blood cells are an essential component of blood. Blood is a constantly circulating fluid providing the body with nutrition, oxygen, and waste removal.

Complete answer:
RBC transfers oxygen to the body's tissues in exchange for carbon dioxide, which they transport to the lungs to be exhaled. The red bone marrow of bones is where red blood cells are generated. Hemocytoblasts are stem cells found in the red bone marrow. They are responsible for the formation of all of the formed components in blood.
A red blood cell takes roughly two days to develop. Every second, the body produces around two million red blood cells. The cellular and liquid components of blood are both present. The generated elements and blood fluid matrix can be separated from each other by spinning a blood sample in a centrifuge.
Red blood cells make up 45 percent of blood, white blood cells and platelets make up less than 1%, and plasma makes up the remaining 55 percent.
Hematopoiesis is the process of producing blood cells. The bone marrow is where blood cells are created. Inside some bones, there's a spongy substance called periosteum. It comprises stem cells, which are youthful parent cells. These blood-forming stem cells have the ability to develop into all three types of blood cells: red blood cells, white blood cells, and platelets. These blood-forming stem cells double themselves and produce adult blood cells.
Blood cells leave the bone marrow and enter the bloodstream when they are fully developed and functioning. Healthy persons have enough stem cells to produce all of the blood cells they require on a daily basis. Blood is the life-maintaining fluid that flows through the body's blood vessels: Arteries,veins and capillaries.

So, the correct answer is bone marrow is the place where blood cells are formed.

Note:
Erythropoietin,a hormone produced mostly by the kidneys, increases the production of erythrocytes in the bone marrow. When body cells receive insufficient oxygen, a condition known as hypoxia, the kidneys boost EPO output, which encourages an increase in erythrocyte synthesis.