The blood is supplied to anterior areas of brain by carotid arteries and to the posterior areas of brain by vertebral arteries. The dysfunction of brain after stroke depends upon the corresponding brain area associated with blocked artery. The middle cerebral artery (found in cerebrum portion of brain) is most commonly blocked in stroke.
Stroke occurs when brain cells are deprived of oxygen due to the lack of blood cell. There are several type of strokes. It may be caused by the blockage of blood vessels due to depositions of cholesterol in blood vessels. It hardened the walls of blood vessels and narrow them causing hindrance in the blood flow. If this clot remain at one place it is known as ischemic stroke and if it can convert to embolus and travel across the body it would cause the embolic stroke.
Haemorrhagic stroke is caused due to rupturing of one of the blood vessel and it is the most crucial form of stroke.
When the blood supply to parts of the brain is cut off, there is lack of oxygen supply to the brain tissues in that area and since brain tissues survive on oxygen for fuel, they begin to die off. This leads to ischemic stroke.
The cause of ischemic stroke may be as a result of the formation of a clot in the arterial walls called thrombus. This clot grows gradually and finally blocks off the artery completely.
Another cause may be from a clot called embolus, getting into the bloodstream and getting stuck in the arteries supplying blood to the brain.
Ischemic stroke leads to the loss of the part of the brain affected and the body systems and parts it is controlling. Paralysis and blindness are examples.
Explanation: We have two parts to our nervous system. The central nervous system and the peripheral nervous system. The CNS is located in the brain and spinal cord the PNS is the nerves and ganglia outside of those.
The system that controls and coordinates
the body through hormones is the <span>endocrine system.</span>
<span>Endocrine system produces hormones and then these hormones
transmit the messages to various cells within the body. Hormones have great
importance in our body system and even our body is functioning due to hormones.
If hormones are disturbed it can lead to
many diseases.</span>
During cellular respiration the cell uses oxygen to break down sugar. When sugar breaks down it produces energy in which your body needs. Blood picks up oxygen and releses carbon dioxide into your lungs.
