Think of a stroke as a "brain attack"— it is an emergency! When symptoms appear call 911 immediately; every minute counts. A stroke occurs when the brain is deprived of blood supply. Without oxygen brain cells die. Depending on the area affected, a person may have problems speaking, walking, seeing, or thinking. It may result in permanent brain damage, disability or death. If the stroke is caused by a blood clot, a clot-busting drug may be given to restore blood supply.To understand stroke, it is helpful to understand the circulatory system of the brain (see Anatomy of the Brain). Blood is carried to the brain by two paired arteries, the internal carotid arteries and the vertebral arteries (Fig. 1). The internal carotid arteries supply the anterior (front) areas and the vertebral arteries supply the posterior (back) areas of the brain. After passing through the skull, the right and left vertebral arteries join together to form a single basilar artery.
The basilar artery and the internal carotid arteries “communicate” with each other in a ring at the base of the brain called the Circle of Willis by the anterior communicating (Acom) and posterior communicating (Pcom) arteries. The middle cerebral artery is the artery most often occluded in stroke.
Answer: The correct answer is option C. To form RNA molecules from DNA molecule.
Explanation:
The main function of transcription is to form ribonucleic acid (RNA) molecules from deoxyribonucleic acid (DNA) molecule present in the nucleus. In transcription, small part of DNA is copied and attached to the RNA molecule with the help of enzymes i. e. RNA polymerase.
Answer:
C the shapes of continents appeared to allow them to fit together
Too much fertilizer can ruin the earth because it releases methane gas which it harmful for the envoronment
Inside each cell, genes make up a blueprint for protein production that determines how the cell will function. ... These cellular power plants have their own genome and do not recombine during reproduction. Chromosomes. Chromosomes carry hereditary, genetic information in long strings of DNA called genes
