Circulatory system Blood is circulated around the body through blood vessels by the pumping action of the heart. In humans, blood is pumped from the strong left ventricle of the heart through arteries to peripheral tissues and returns to the right atrium of the heart through veins.
|Blood components||Red Blood Cells Erythrocytes Most abundant cells in the blood Account for approximately 40 to 45 percent of the blood. Biconcave disc which is round and flat, sort of like a shallow bowl.|
|Characteristics of blood||Related Atlas Images Stem Cells Before a cell becomes specialised, it first starts out as a stem cell. The unique feature of stem cells is that they are pluripotent - they have the potential to become any type of cell in the body.|
|red blood cell | Definition, Functions, & Facts | rutadeltambor.com||The red blood cells are highly specialized, well adapted for their primary function of transporting oxygen from the lungs to all of the body tissues. Red cells are approximately 7.|
These cells grow and divide, function, repair and self destruct in a controlled manner so that the organism develops properly. A human body consists of different kinds of specialized cells making up to around cells in total.
Lot of important functions are carried out by specialized cells like nerve cells, blood cells, heart cells, epithelial, exocrine and endocrine cells.
The normal cells have certain important characteristics like cell reproduction, cell adhesion, cell destruction and cell specialization that are necessary for the proper functioning of tissues, organs and body systems. These cells reproduce correctly, stop reproduction and also self-destruct if necessary.
Cell reproduction is done in order to replace the damaged or aged cells with new ones. Cells divide and reproduce in two ways — Mitosis and Meiosis. Mitosis is a process of asexual reproduction that takes care of general growth and repair of the body. This process regenerates all cells except the sex cells by splitting into two identical copies of the original cell.
Sex cells reproduce through Meiosis in which cells split to form new cells. Cells have adhesion molecules on their surface that help them to adhere to the cell membranes of other cells.
Cell adhesion helps cells to stay in their location. Normal cells have the ability to develop into specialized cells like heart cells, brain cells, lung cells etc.
When cells get damaged or injured, they destruct themselves through a process called apoptosis and white blood cells dispose them.Blood, fluid that transports oxygen and nutrients to the cells and carries away carbon dioxide and other waste products.
Technically, blood is a transport liquid pumped by the heart (or an equivalent structure) to all parts of the body, after which it is returned to the heart to repeat the process. Blood cells are the cells which are produced during hematopoiesis and found mainly in the blood. Blood is composed of the blood cells which accounts for 45% of the blood tissue by volume, with the remaining 55% of the volume composed of plasma, the liquid portion of the blood.
Dec 12, · (iii) Gases O2 and CO2 are trasported by blood.
(iv) Blood helps in body defences against disease, neutrophils and monocytes engulf and destroy invading microorganisms e.g. bacteria. There are over different cell types in the human body, each specialised to carry out a particular function, or form a particular tissue.
The main types of cells in the human body are listed below: Stem cells. Red blood cells (erythrocytes) White blood cells (leukocytes) Platelets. Nerve cells . There are at least 10 times as many bacteria in the human body as cells. The average adult takes over 20, breaths a day.
Each day, the kidneys process about quarts (50 gallons) of blood to filter out about 2 quarts of waste and water. Adults excrete about a .
Blood accounts for 7% of the human body weight, with an average density around kg/m 3, very close to pure water's density of kg/m 3. The average adult has a blood volume of roughly 5 litres (11 US pt),  which is composed of plasma and several kinds of cells.